repo fix

* Add exemplars simple example, add go runtime and process collectors to simple example

Signed-off-by: Jéssica Lins <jessicaalins@gmail.com>

* Add middleware example

Signed-off-by: Jéssica Lins <jessicaalins@gmail.com>

* Lint

Signed-off-by: Jéssica Lins <jessicaalins@gmail.com>

Signed-off-by: Jéssica Lins <jessicaalins@gmail.com>

.circleci/config.yml

@@ -1,7 +1,7 @@
 version: 2.1
 orbs:
-  go: circleci/go@0.2.0
-  prometheus: prometheus/prometheus@0.11.0
+  go: circleci/go@1.7.1
+  prometheus: prometheus/prometheus@0.16.0
 jobs:
   test:
     parameters:
@@ -17,8 +17,7 @@ jobs:
         type: boolean
         default: true
     docker:
-      - image: circleci/golang:<< parameters.go_version >>
-    working_directory: /go/src/github.com/prometheus/client_golang
+      - image: cimg/go:<< parameters.go_version >>
     steps:
       - checkout
       - when:
@@ -48,20 +47,16 @@ workflows:
     jobs:
       # Refer to README.md for the currently supported versions.
       - test:
-          name: go-1-13
-          go_version: "1.13"
+          name: go-1-17
+          go_version: "1.17"
           run_lint: true
       - test:
-          name: go-1-14
-          go_version: "1.14"
+          name: go-1-18
+          go_version: "1.18"
           run_lint: true
       - test:
-          name: go-1-15
-          go_version: "1.15"
-          run_lint: true
-      - test:
-          name: go-1-16
-          go_version: "1.16"
+          name: go-1-19
+          go_version: "1.19"
           run_lint: true
           # Style and unused/missing packages are only checked against
           # the latest supported Go version.

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/settings.yml

@@ -0,0 +1,34 @@
+---
+branches:
+  - name: main
+    protection:
+      # Required. Require at least one approving review on a pull request, before merging. Set to null to disable.
+      required_pull_request_reviews:
+        # The number of approvals required. (1-6)
+        required_approving_review_count: 1
+        # Dismiss approved reviews automatically when a new commit is pushed.
+        dismiss_stale_reviews: false
+        # Blocks merge until code owners have reviewed.
+        require_code_owner_reviews: false
+        # Specify which users and teams can dismiss pull request reviews. Pass an empty dismissal_restrictions object to disable. User and team dismissal_restrictions are only available for organization-owned repositories. Omit this parameter for personal repositories.
+        dismissal_restrictions:
+          users: []
+          teams: []
+      # Required. Require status checks to pass before merging. Set to null to disable
+      required_status_checks:
+        # Required. Require branches to be up to date before merging.
+        strict: false
+        # Required. The list of status checks to require in order to merge into this branch
+        contexts:
+          - DCO
+          - "ci/circleci: go-1-17"
+          - "ci/circleci: go-1-18"
+      # Required. Enforce all configured restrictions for administrators. Set to true to enforce required status checks for repository administrators. Set to null to disable.
+      enforce_admins: false
+      # Prevent merge commits from being pushed to matching branches
+      required_linear_history: false
+      # Required. Restrict who can push to this branch. Team and user restrictions are only available for organization-owned repositories. Set to null to disable.
+      restrictions:
+        apps: []
+        users: []
+        teams: []

.github/stale.yml

@@ -0,0 +1,88 @@
+# Configuration for probot-stale - https://github.com/probot/stale
+
+# Number of days of inactivity before an Issue or Pull Request becomes stale
+# daysUntilStale: 30
+
+# Number of days of inactivity before an Issue or Pull Request with the stale label is closed.
+# Set to false to disable. If disabled, issues still need to be closed manually, but will remain marked as stale.
+# daysUntilClose: 7
+
+# NOTICE: Check below for the individual settings for each type of event.
+
+# Only issues or pull requests with all of these labels are check if stale. Defaults to `[]` (disabled)
+onlyLabels: []
+
+# Issues or Pull Requests with these labels will never be considered stale. Set to `[]` to disable
+exemptLabels:
+  - pinned
+  - security
+  - keep-open
+  - wip
+  - "[Status] Maybe Later"
+
+# Set to true to ignore issues in a project (defaults to false)
+exemptProjects: true # default: false
+
+# Set to true to ignore issues in a milestone (defaults to false)
+exemptMilestones: true # default: false
+
+# Set to true to ignore issues with an assignee (defaults to false)
+exemptAssignees: false
+
+# Label to use when marking as stale
+staleLabel: stale
+
+# Comment to post when marking as stale. Set to `false` to disable
+# markComment: >
+#  This issue has been automatically marked as stale because it has not had
+#  recent activity. It will be closed if no further activity occurs. Thank you
+#  for your contributions.
+
+# Comment to post when removing the stale label.
+# unmarkComment: >
+#   Your comment here.
+
+# Comment to post when closing a stale Issue or Pull Request.
+# closeComment: >
+#   Your comment here.
+
+# Limit the number of actions per hour, from 1-30. Default is 30
+limitPerRun: 30
+
+# Limit to only `issues` or `pulls`
+# only: issues
+
+# Optionally, specify configuration settings that are specific to just 'issues' or 'pulls':
+# pulls:
+#   daysUntilStale: 30
+#   markComment: >
+#     This pull request has been automatically marked as stale because it has not had
+#     recent activity. It will be closed if no further activity occurs. Thank you
+#     for your contributions.
+
+# issues:
+#   exemptLabels:
+#     - confirmed
+
+pull:
+  daysUntilClose: 14
+  daysUntilStale: 60
+  markComment: >
+    Hello 👋 Looks like there was no activity on this amazing PR for the last 60 days.
+    **Do you mind updating us on the status?** Is there anything we can help with? If you plan to still work on it, just comment on this PR or push a commit. Thanks! 🤗
+    
+    If there will be no activity in the next 2 weeks, this issue will be closed (we can always reopen a PR if you get back to this!).
+  # unmarkComment: No need for unmark comment.
+  closeComment: >
+    Closing for now as promised, let us know if you need this to be reopened! 🤗
+issues:
+  daysUntilClose: 90
+  daysUntilStale: 180
+  markComment: >
+    Hello 👋 Looks like there was no activity on this issue for the last 3 months.
+    **Do you mind updating us on the status?** Is this still reproducible or needed? If yes, just comment on this PR or push a commit. Thanks! 🤗
+    
+    If there will be no activity in the next 4 weeks, this issue will be closed (we can always reopen an issue if we need!).
+  # unmarkComment: No need for unmark comment.
+  closeComment: >
+    Closing for now as promised, let us know if you need this to be reopened! 🤗

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,70 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ main ]
+  schedule:
+    - cron: '31 21 * * 6'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python', 'ruby' ]
+        # Learn more about CodeQL language support at https://git.io/codeql-language-support
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1

.github/workflows/golangci-lint.yml

@@ -0,0 +1,30 @@
+name: golangci-lint
+on:
+  push:
+    paths:
+      - "go.sum"
+      - "go.mod"
+      - "**.go"
+      - "scripts/errcheck_excludes.txt"
+      - ".github/workflows/golangci-lint.yml"
+      - ".golangci.yml"
+  pull_request:
+
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.18.x
+      - name: Install snmp_exporter/generator dependencies
+        run: sudo apt-get update && sudo apt-get -y install libsnmp-dev
+        if: github.repository == 'prometheus/snmp_exporter'
+      - name: Lint
+        uses: golangci/golangci-lint-action@v3.2.0
+        with:
+          version: v1.45.2

.gitignore

@@ -1,6 +1,7 @@
 # Examples
 examples/simple/simple
 examples/random/random
+examples/gocollector/gocollector
 
 # Typical backup/temporary files of editors
 *~
@@ -11,7 +12,7 @@ examples/random/random
 vendor/
 
 # The remainder of this file is taken from
-# https://github.com/github/gitignore/blob/master/Go.gitignore
+# https://github.com/github/gitignore/blob/main/Go.gitignore
 
 # Binaries for programs and plugins
 *.exe

.go-version

@@ -0,0 +1 @@
+1.18

.golangci.yml

@@ -1,5 +1,47 @@
-# Run only staticcheck for now. Additional linters will be enabled one-by-one.
+---
+
+run:
+  deadline: 5m
+
+output:
+  sort-results: true
+
 linters:
   enable:
-  - staticcheck
-  disable-all: true
+    - deadcode
+    - depguard
+    - durationcheck
+    - errorlint
+    - exportloopref
+    - gofmt
+    - gofumpt
+    - goimports
+    - gosimple
+    - ineffassign
+    - misspell
+    - nolintlint
+    - predeclared
+    - revive
+    - staticcheck
+    - structcheck
+    - unconvert
+    - unused
+    - varcheck
+    - wastedassign
+
+issues:
+  max-same-issues: 0
+  exclude-rules:
+    - path: _test.go
+      linters:
+        - errcheck
+        - govet
+        - structcheck
+
+linters-settings:
+  errcheck:
+    exclude: scripts/errcheck_excludes.txt
+  goimports:
+    local-prefixes: git.internal/re/client_golang
+  gofumpt:
+    extra-rules: true

CHANGELOG.md

@@ -1,9 +1,69 @@
+## Unreleased
+
+## 1.14.0 / 2022-11-08
+
+* [FEATURE] Add Support for Native Histograms. #1150
+* [CHANGE] Extend `prometheus.Registry` to implement `prometheus.Collector` interface. #1103
+
+## 1.13.1 / 2022-11-01
+
+* [BUGFIX] Fix race condition with Exemplar in Counter. #1146
+* [BUGFIX] Fix `CumulativeCount` value of `+Inf` bucket created from exemplar. #1148
+* [BUGFIX] Fix double-counting bug in `promhttp.InstrumentRoundTripperCounter`. #1118
+
+## 1.13.0 / 2022-08-05
+
+* [CHANGE] Minimum required Go version is now 1.17 (we also test client_golang against new 1.19 version).
+* [ENHANCEMENT] Added `prometheus.TransactionalGatherer` interface for `promhttp.Handler` use which allows using low allocation update techniques for custom collectors. #989
+* [ENHANCEMENT] Added exemplar support to `prometheus.NewConstHistogram`. See [`ExampleNewConstHistogram_WithExemplar`](prometheus/examples_test.go#L602) example on how to use it. #986
+* [ENHANCEMENT] `prometheus/push.Pusher` has now context aware methods that pass context to HTTP request. #1028
+* [ENHANCEMENT] `prometheus/push.Pusher` has now `Error` method that retrieve last error. #1075
+* [ENHANCEMENT] `testutil.GatherAndCompare` provides now readable diff on failed comparisons. #998
+* [ENHANCEMENT] Query API now supports timeouts. #1014
+* [ENHANCEMENT] New `MetricVec` method `DeletePartialMatch(labels Labels)` for deleting all metrics that match provided labels. #1013
+* [ENHANCEMENT] `api.Config` now accepts passing custom `*http.Client`. #1025
+* [BUGFIX] Raise exemplar labels limit from 64 to 128 bytes as specified in OpenMetrics spec. #1091
+* [BUGFIX] Allow adding exemplar to +Inf bucket to const histograms. #1094
+* [ENHANCEMENT] Most `promhttp.Instrument*` middlewares now supports adding exemplars to metrics. This allows hooking those to your tracing middleware that retrieves trace ID and put it in exemplar if present. #1055
+* [ENHANCEMENT] Added `testutil.ScrapeAndCompare` method. #1043
+* [BUGFIX] Fixed `GopherJS` build support. #897
+* [ENHANCEMENT] :warning: Added way to specify what `runtime/metrics`  `collectors.NewGoCollector` should use. See [`ExampleGoCollector_WithAdvancedGoMetrics`](prometheus/collectors/go_collector_latest_test.go#L263). #1102
+
+## 1.12.2 / 2022-05-13
+
+* [CHANGE] Added `collectors.WithGoCollections` that allows to choose what collection of Go runtime metrics user wants: Equivalent of [`MemStats` structure](https://pkg.go.dev/runtime#MemStats) configured using `GoRuntimeMemStatsCollection`, new based on dedicated [runtime/metrics](https://pkg.go.dev/runtime/metrics) metrics represented by `GoRuntimeMetricsCollection` option, or both by specifying `GoRuntimeMemStatsCollection | GoRuntimeMetricsCollection` flag. #1031
+* [CHANGE] :warning: Change in `collectors.NewGoCollector` metrics: Reverting addition of new ~80 runtime metrics by default. You can enable this back with `GoRuntimeMetricsCollection` option or `GoRuntimeMemStatsCollection | GoRuntimeMetricsCollection` for smooth transition.
+* [BUGFIX] Fixed the bug that causes generated histogram metric names to end with `_total`. ⚠️ This changes 3 metric names in the new Go collector that was reverted from default in this release.
+  * `go_gc_heap_allocs_by_size_bytes_total` -> `go_gc_heap_allocs_by_size_bytes`,
+  * `go_gc_heap_frees_by_size_bytes_total` -> `go_gc_heap_allocs_by_size_bytes`
+  * `go_gc_pauses_seconds_total` -> `go_gc_pauses_seconds`.
+* [CHANCE] Removed `-Inf` buckets from new Go Collector histograms.
+
+## 1.12.1 / 2022-01-29
+
+* [BUGFIX] Make the Go 1.17 collector concurrency-safe #969
+  * Use simpler locking in the Go 1.17 collector #975
+* [BUGFIX] Reduce granularity of histogram buckets for Go 1.17 collector #974
+* [ENHANCEMENT] API client: make HTTP reads more efficient #976
+
+## 1.12.0 / 2022-01-19
+
+* [CHANGE] example/random: Move flags and metrics into main() #935
+* [FEATURE] API client: Support wal replay status api #944
+* [FEATURE] Use the runtime/metrics package for the Go collector for 1.17+ #955
+* [ENHANCEMENT] API client: Update /api/v1/status/tsdb to include headStats #925
+* [ENHANCEMENT] promhttp: Check validity of method and code label values #962
+
 ## 1.11.0 / 2021-06-07
 
-* [ENHANCEMENT] API client: Add newer fields to Rules API #855
-* [ENHANCEMENT] API client: Add missing fields to Targets API #856
-* [FEATURE] API client: Add exemplars API support #861
-* [CHANGE] Add new collectors package #862
+* [CHANGE] Add new collectors package. #862
+* [CHANGE] `prometheus.NewExpvarCollector` is deprecated, use `collectors.NewExpvarCollector` instead. #862
+* [CHANGE] `prometheus.NewGoCollector` is deprecated, use `collectors.NewGoCollector` instead. #862
+* [CHANGE] `prometheus.NewBuildInfoCollector` is deprecated, use `collectors.NewBuildInfoCollector` instead. #862
+* [FEATURE] Add new collector for database/sql#DBStats. #866
+* [FEATURE] API client: Add exemplars API support. #861
+* [ENHANCEMENT] API client: Add newer fields to Rules API. #855
+* [ENHANCEMENT] API client: Add missing fields to Targets API. #856
 
 ## 1.10.0 / 2021-03-18
 
@@ -21,7 +81,7 @@
 
 * [CHANGE] API client: Use `time.Time` rather than `string` for timestamps in `RuntimeinfoResult`. #777
 * [FEATURE] Export `MetricVec` to facilitate implementation of vectors of custom `Metric` types. #803
-* [FEATURE API client: Support `/status/tsdb` endpoint. #773
+* [FEATURE] API client: Support `/status/tsdb` endpoint. #773
 * [ENHANCEMENT] API client: Enable GET fallback on status code 501. #802
 * [ENHANCEMENT] Remove `Metric` references after reslicing to free up more memory. #784
 
@@ -101,6 +161,7 @@ _This release removes all previously deprecated features, resulting in the break
 * [BUGFIX] Make `AlreadyRegisteredError` usable for wrapped registries. #607
 
 ## 0.9.4 / 2019-06-07
+
 * [CHANGE] API client: Switch to alert values as strings. #585
 * [FEATURE] Add a collector for Go module build information. #595
 * [FEATURE] promhttp: Add an counter for internal errors during HTTP exposition. #594
@@ -110,6 +171,7 @@ _This release removes all previously deprecated features, resulting in the break
 * [BUGFIX] Reduce test flakiness. #573
 
 ## 0.9.3 / 2019-05-16
+
 * [CHANGE] Required Go version is now 1.9+. #561
 * [FEATURE] API client: Add POST with get fallback for Query/QueryRange. #557
 * [FEATURE] API client: Add alerts endpoint. #552
@@ -131,6 +193,7 @@ _This release removes all previously deprecated features, resulting in the break
 * [BUGFIX] API client: Deal with discovered labels properly. #529
 
 ## 0.9.2 / 2018-12-06
+
 * [FEATURE] Support for Go modules. #501
 * [FEATURE] `Timer.ObserveDuration` returns observed duration. #509
 * [ENHANCEMENT] Improved doc comments and error messages. #504
@@ -139,6 +202,7 @@ _This release removes all previously deprecated features, resulting in the break
   #498
 
 ## 0.9.1 / 2018-11-03
+
 * [FEATURE] Add `WriteToTextfile` function to facilitate the creation of
   *.prom files for the textfile collector of the node exporter. #489
 * [ENHANCEMENT] More descriptive error messages for inconsistent label
@@ -151,6 +215,7 @@ _This release removes all previously deprecated features, resulting in the break
   #479
 
 ## 0.9.0 / 2018-10-15
+
 * [CHANGE] Go1.6 is no longer supported.
 * [CHANGE] More refinements of the `Registry` consistency checks: Duplicated
   labels are now detected, but inconsistent label dimensions are now allowed.
@@ -203,6 +268,7 @@ _This release removes all previously deprecated features, resulting in the break
   responses. #476 #414
 
 ## 0.8.0 / 2016-08-17
+
 * [CHANGE] Registry is doing more consistency checks. This might break
   existing setups that used to export inconsistent metrics.
 * [CHANGE] Pushing to Pushgateway moved to package `push` and changed to allow
@@ -226,6 +292,7 @@ _This release removes all previously deprecated features, resulting in the break
 * [BUGFIX] Handle collisions in MetricVec.
 
 ## 0.7.0 / 2015-07-27
+
 * [CHANGE] Rename ExporterLabelPrefix to ExportedLabelPrefix.
 * [BUGFIX] Closed gaps in metric consistency check.
 * [BUGFIX] Validate LabelName/LabelSet on JSON unmarshaling.
@@ -236,12 +303,14 @@ _This release removes all previously deprecated features, resulting in the break
 * [ENHANCEMENT] Change responseWriterDelegator.written to int64.
 
 ## 0.6.0 / 2015-06-01
+
 * [CHANGE] Rename process_goroutines to go_goroutines.
 * [ENHANCEMENT] Validate label names during YAML decoding.
 * [ENHANCEMENT] Add LabelName regular expression.
 * [BUGFIX] Ensure alignment of struct members for 32-bit systems.
 
 ## 0.5.0 / 2015-05-06
+
 * [BUGFIX] Removed a weakness in the fingerprinting aka signature code.
   This makes fingerprinting slower and more allocation-heavy, but the
   weakness was too severe to be tolerated.
@@ -260,6 +329,7 @@ _This release removes all previously deprecated features, resulting in the break
 * [CHANGE] A number of new reserved labels and prefixes.
 
 ## 0.4.0 / 2015-04-08
+
 * [CHANGE] Return NaN when Summaries have no observations yet.
 * [BUGFIX] Properly handle Summary decay upon Write().
 * [BUGFIX] Fix the documentation link to the consumption library.
@@ -269,16 +339,19 @@ _This release removes all previously deprecated features, resulting in the break
 * [MAINTENANCE] Adjusted to changes in matttproud/golang_protobuf_extensions.
 
 ## 0.3.2 / 2015-03-11
+
 * [BUGFIX] Fixed the receiver type of COWMetric.Set(). This method is
   only used by the Prometheus server internally.
 * [CLEANUP] Added licenses of vendored code left out by godep.
 
 ## 0.3.1 / 2015-03-04
+
 * [ENHANCEMENT] Switched fingerprinting functions from own free list to
   sync.Pool.
 * [CHANGE] Makefile uses Go 1.4.2 now (only relevant for examples and tests).
 
 ## 0.3.0 / 2015-03-03
+
 * [CHANGE] Changed the fingerprinting for metrics. THIS WILL INVALIDATE ALL
   PERSISTED FINGERPRINTS. IF YOU COMPILE THE PROMETHEUS SERVER WITH THIS
   VERSION, YOU HAVE TO WIPE THE PREVIOUSLY CREATED STORAGE.
@@ -293,6 +366,7 @@ _This release removes all previously deprecated features, resulting in the break
   require fewer allocations than the ones currently used by the server.
 
 ## 0.2.0 / 2015-02-23
+
 * [FEATURE] Introduce new Histagram metric type.
 * [CHANGE] Ignore process collector errors for now (better error handling
   pending).
@@ -309,5 +383,6 @@ _This release removes all previously deprecated features, resulting in the break
 * [CLEANUP] Updated vendoring of beorn7/perks.
 
 ## 0.1.0 / 2015-02-02
+
 * [CLEANUP] Introduced semantic versioning and changelog. From now on,
   changes will be reported in this file.

CODE_OF_CONDUCT.md

@@ -1,3 +1,3 @@
-## Prometheus Community Code of Conduct
+# Prometheus Community Code of Conduct
 
-Prometheus follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).
+Prometheus follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/main/code-of-conduct.md).

Dockerfile

@@ -1,23 +1,34 @@
 # This Dockerfile builds an image for a client_golang example.
 #
 # Use as (from the root for the client_golang repository):
-#    docker build -f examples/$name/Dockerfile -t prometheus/golang-example-$name .
+#    docker build -f Dockerfile -t prometheus/golang-example .
+
+# Run as
+#    docker run -P prometheus/golang-example /random
+# or
+#    docker run -P prometheus/golang-example /simple
+
+# Test as
+#    curl $ip:$port/metrics
 
 # Builder image, where we build the example.
 FROM golang:1 AS builder
-WORKDIR /go/src/github.com/prometheus/client_golang
+WORKDIR /go/src/git.internal/re/client_golang
 COPY . .
-WORKDIR /go/src/github.com/prometheus/client_golang/prometheus
+WORKDIR /go/src/git.internal/re/client_golang/prometheus
 RUN go get -d
-WORKDIR /go/src/github.com/prometheus/client_golang/examples/random
+WORKDIR /go/src/git.internal/re/client_golang/examples/random
 RUN CGO_ENABLED=0 GOOS=linux go build -a -tags netgo -ldflags '-w'
-WORKDIR /go/src/github.com/prometheus/client_golang/examples/simple
+WORKDIR /go/src/git.internal/re/client_golang/examples/simple
+RUN CGO_ENABLED=0 GOOS=linux go build -a -tags netgo -ldflags '-w'
+WORKDIR /go/src/git.internal/re/client_golang/examples/gocollector
 RUN CGO_ENABLED=0 GOOS=linux go build -a -tags netgo -ldflags '-w'
 
 # Final image.
 FROM quay.io/prometheus/busybox:latest
 LABEL maintainer="The Prometheus Authors <prometheus-developers@googlegroups.com>"
-COPY --from=builder /go/src/github.com/prometheus/client_golang/examples/random \
-    /go/src/github.com/prometheus/client_golang/examples/simple ./
+COPY --from=builder /go/src/git.internal/re/client_golang/examples/random \
+    /go/src/git.internal/re/client_golang/examples/simple \
+    /go/src/git.internal/re/client_golang/examples/gocollector ./
 EXPOSE 8080
-CMD ["echo", "Please run an example. Either /random or /simple"]
+CMD ["echo", "Please run an example. Either /random, /simple or /gocollector"]

Makefile

@@ -18,3 +18,11 @@ test: deps common-test
 
 .PHONY: test-short
 test-short: deps common-test-short
+
+.PHONY: generate-go-collector-test-files
+VERSIONS := 1.17 1.18 1.19
+generate-go-collector-test-files:
+	for GO_VERSION in $(VERSIONS); do \
+    	docker run --rm -v $(PWD):/workspace -w /workspace golang:$$GO_VERSION go run prometheus/gen_go_collector_metrics_set.go; \
+		mv -f go_collector_metrics* prometheus; \
+    done

Makefile.common

@@ -36,29 +36,6 @@ GO_VERSION        ?= $(shell $(GO) version)
 GO_VERSION_NUMBER ?= $(word 3, $(GO_VERSION))
 PRE_GO_111        ?= $(shell echo $(GO_VERSION_NUMBER) | grep -E 'go1\.(10|[0-9])\.')
 
-GOVENDOR :=
-GO111MODULE :=
-ifeq (, $(PRE_GO_111))
-	ifneq (,$(wildcard go.mod))
-		# Enforce Go modules support just in case the directory is inside GOPATH (and for Travis CI).
-		GO111MODULE := on
-
-		ifneq (,$(wildcard vendor))
-			# Always use the local vendor/ directory to satisfy the dependencies.
-			GOOPTS := $(GOOPTS) -mod=vendor
-		endif
-	endif
-else
-	ifneq (,$(wildcard go.mod))
-		ifneq (,$(wildcard vendor))
-$(warning This repository requires Go >= 1.11 because of Go modules)
-$(warning Some recipes may not work as expected as the current Go runtime is '$(GO_VERSION_NUMBER)')
-		endif
-	else
-		# This repository isn't using Go modules (yet).
-		GOVENDOR := $(FIRST_GOPATH)/bin/govendor
-	endif
-endif
 PROMU        := $(FIRST_GOPATH)/bin/promu
 pkgs          = ./...
 
@@ -78,17 +55,23 @@ ifneq ($(shell which gotestsum),)
 endif
 endif
 
-PROMU_VERSION ?= 0.12.0
+PROMU_VERSION ?= 0.13.0
 PROMU_URL     := https://github.com/prometheus/promu/releases/download/v$(PROMU_VERSION)/promu-$(PROMU_VERSION).$(GO_BUILD_PLATFORM).tar.gz
 
 GOLANGCI_LINT :=
 GOLANGCI_LINT_OPTS ?=
-GOLANGCI_LINT_VERSION ?= v1.39.0
+GOLANGCI_LINT_VERSION ?= v1.45.2
 # golangci-lint only supports linux, darwin and windows platforms on i386/amd64.
 # windows isn't included here because of the path separator being different.
 ifeq ($(GOHOSTOS),$(filter $(GOHOSTOS),linux darwin))
 	ifeq ($(GOHOSTARCH),$(filter $(GOHOSTARCH),amd64 i386))
-		GOLANGCI_LINT := $(FIRST_GOPATH)/bin/golangci-lint
+		# If we're in CI and there is an Actions file, that means the linter
+		# is being run in Actions, so we don't need to run it here.
+		ifeq (,$(CIRCLE_JOB))
+			GOLANGCI_LINT := $(FIRST_GOPATH)/bin/golangci-lint
+		else ifeq (,$(wildcard .github/workflows/golangci-lint.yml))
+			GOLANGCI_LINT := $(FIRST_GOPATH)/bin/golangci-lint
+		endif
 	endif
 endif
 
@@ -118,7 +101,7 @@ endif
 %: common-% ;
 
 .PHONY: common-all
-common-all: precheck style check_license lint unused build test
+common-all: precheck style check_license lint yamllint unused build test
 
 .PHONY: common-style
 common-style:
@@ -144,32 +127,25 @@ common-check_license:
 .PHONY: common-deps
 common-deps:
 	@echo ">> getting dependencies"
-ifdef GO111MODULE
-	GO111MODULE=$(GO111MODULE) $(GO) mod download
-else
-	$(GO) get $(GOOPTS) -t ./...
-endif
+	$(GO) mod download
 
 .PHONY: update-go-deps
 update-go-deps:
 	@echo ">> updating Go dependencies"
 	@for m in $$($(GO) list -mod=readonly -m -f '{{ if and (not .Indirect) (not .Main)}}{{.Path}}{{end}}' all); do \
-		$(GO) get $$m; \
+		$(GO) get -d $$m; \
 	done
-	GO111MODULE=$(GO111MODULE) $(GO) mod tidy
-ifneq (,$(wildcard vendor))
-	GO111MODULE=$(GO111MODULE) $(GO) mod vendor
-endif
+	$(GO) mod tidy
 
 .PHONY: common-test-short
 common-test-short: $(GOTEST_DIR)
 	@echo ">> running short tests"
-	GO111MODULE=$(GO111MODULE) $(GOTEST) -short $(GOOPTS) $(pkgs)
+	$(GOTEST) -short $(GOOPTS) $(pkgs)
 
 .PHONY: common-test
 common-test: $(GOTEST_DIR)
 	@echo ">> running all tests"
-	GO111MODULE=$(GO111MODULE) $(GOTEST) $(test-flags) $(GOOPTS) $(pkgs)
+	$(GOTEST) $(test-flags) $(GOOPTS) $(pkgs)
 
 $(GOTEST_DIR):
 	@mkdir -p $@
@@ -177,25 +153,30 @@ $(GOTEST_DIR):
 .PHONY: common-format
 common-format:
 	@echo ">> formatting code"
-	GO111MODULE=$(GO111MODULE) $(GO) fmt $(pkgs)
+	$(GO) fmt $(pkgs)
 
 .PHONY: common-vet
 common-vet:
 	@echo ">> vetting code"
-	GO111MODULE=$(GO111MODULE) $(GO) vet $(GOOPTS) $(pkgs)
+	$(GO) vet $(GOOPTS) $(pkgs)
 
 .PHONY: common-lint
 common-lint: $(GOLANGCI_LINT)
 ifdef GOLANGCI_LINT
 	@echo ">> running golangci-lint"
-ifdef GO111MODULE
 # 'go list' needs to be executed before staticcheck to prepopulate the modules cache.
 # Otherwise staticcheck might fail randomly for some reason not yet explained.
-	GO111MODULE=$(GO111MODULE) $(GO) list -e -compiled -test=true -export=false -deps=true -find=false -tags= -- ./... > /dev/null
-	GO111MODULE=$(GO111MODULE) $(GOLANGCI_LINT) run $(GOLANGCI_LINT_OPTS) $(pkgs)
-else
-	$(GOLANGCI_LINT) run $(pkgs)
+	$(GO) list -e -compiled -test=true -export=false -deps=true -find=false -tags= -- ./... > /dev/null
+	$(GOLANGCI_LINT) run $(GOLANGCI_LINT_OPTS) $(pkgs)
 endif
+
+.PHONY: common-yamllint
+common-yamllint:
+	@echo ">> running yamllint on all YAML files in the repository"
+ifeq (, $(shell which yamllint))
+	@echo "yamllint not installed so skipping"
+else
+	yamllint .
 endif
 
 # For backward-compatibility.
@@ -203,28 +184,15 @@ endif
 common-staticcheck: lint
 
 .PHONY: common-unused
-common-unused: $(GOVENDOR)
-ifdef GOVENDOR
-	@echo ">> running check for unused packages"
-	@$(GOVENDOR) list +unused | grep . && exit 1 || echo 'No unused packages'
-else
-ifdef GO111MODULE
+common-unused:
 	@echo ">> running check for unused/missing packages in go.mod"
-	GO111MODULE=$(GO111MODULE) $(GO) mod tidy
-ifeq (,$(wildcard vendor))
+	$(GO) mod tidy
 	@git diff --exit-code -- go.sum go.mod
-else
-	@echo ">> running check for unused packages in vendor/"
-	GO111MODULE=$(GO111MODULE) $(GO) mod vendor
-	@git diff --exit-code -- go.sum go.mod vendor/
-endif
-endif
-endif
 
 .PHONY: common-build
 common-build: promu
 	@echo ">> building binaries"
-	GO111MODULE=$(GO111MODULE) $(PROMU) build --prefix $(PREFIX) $(PROMU_BINARIES)
+	$(PROMU) build --prefix $(PREFIX) $(PROMU_BINARIES)
 
 .PHONY: common-tarball
 common-tarball: promu
@@ -280,12 +248,6 @@ $(GOLANGCI_LINT):
 		| sh -s -- -b $(FIRST_GOPATH)/bin $(GOLANGCI_LINT_VERSION)
 endif
 
-ifdef GOVENDOR
-.PHONY: $(GOVENDOR)
-$(GOVENDOR):
-	GOOS= GOARCH= $(GO) get -u github.com/kardianos/govendor
-endif
-
 .PHONY: precheck
 precheck::
 

README.md

@@ -1,15 +1,16 @@
 # Prometheus Go client library
 
-[![Build Status](https://travis-ci.org/prometheus/client_golang.svg?branch=master)](https://travis-ci.org/prometheus/client_golang)
-[![Go Report Card](https://goreportcard.com/badge/github.com/prometheus/client_golang)](https://goreportcard.com/report/github.com/prometheus/client_golang)
-[![go-doc](https://godoc.org/github.com/prometheus/client_golang?status.svg)](https://godoc.org/github.com/prometheus/client_golang)
+[![CircleCI](https://circleci.com/gh/prometheus/client_golang/tree/main.svg?style=svg)](https://circleci.com/gh/prometheus/client_golang/tree/main)
+[![Go Report Card](https://goreportcard.com/badge/git.internal/re/client_golang)](https://goreportcard.com/report/git.internal/re/client_golang)
+[![Go Reference](https://pkg.go.dev/badge/git.internal/re/client_golang.svg)](https://pkg.go.dev/git.internal/re/client_golang)
+[![Slack](https://img.shields.io/badge/join%20slack-%23prometheus--client_golang-brightgreen.svg)](https://slack.cncf.io/)
 
 This is the [Go](http://golang.org) client library for
 [Prometheus](http://prometheus.io). It has two separate parts, one for
 instrumenting application code, and one for creating clients that talk to the
 Prometheus HTTP API.
 
-__This library requires Go1.13 or later.__
+__This library requires Go1.17 or later.__
 
 ## Important note about releases and stability
 
@@ -22,33 +23,33 @@ CHANGELOG.md.
 
 Features that require breaking changes in the stable parts of the repository
 are being batched up and tracked in the [v2
-milestone](https://github.com/prometheus/client_golang/milestone/2). The v2
+milestone](https://git.internal/re/client_golang/milestone/2). The v2
 development happens in a [separate
-branch](https://github.com/prometheus/client_golang/tree/dev-v2) for the time
+branch](https://git.internal/re/client_golang/tree/dev-v2) for the time
 being. v2 releases off that branch will happen once sufficient stability is
 reached. In view of the widespread use of this repository, v1 and v2 will
 coexist for a while to enable a convenient transition.
 
 ## Instrumenting applications
 
-[![code-coverage](http://gocover.io/_badge/github.com/prometheus/client_golang/prometheus)](http://gocover.io/github.com/prometheus/client_golang/prometheus) [![go-doc](https://godoc.org/github.com/prometheus/client_golang/prometheus?status.svg)](https://godoc.org/github.com/prometheus/client_golang/prometheus)
+[![code-coverage](http://gocover.io/_badge/git.internal/re/client_golang/prometheus)](http://gocover.io/git.internal/re/client_golang/prometheus) [![Go Reference](https://pkg.go.dev/badge/git.internal/re/client_golang/prometheus.svg)](https://pkg.go.dev/git.internal/re/client_golang/prometheus)
 
 The
-[`prometheus` directory](https://github.com/prometheus/client_golang/tree/master/prometheus)
+[`prometheus` directory](https://git.internal/re/client_golang/tree/main/prometheus)
 contains the instrumentation library. See the
 [guide](https://prometheus.io/docs/guides/go-application/) on the Prometheus
 website to learn more about instrumenting applications.
 
 The
-[`examples` directory](https://github.com/prometheus/client_golang/tree/master/examples)
+[`examples` directory](https://git.internal/re/client_golang/tree/main/examples)
 contains simple examples of instrumented code.
 
 ## Client for the Prometheus HTTP API
 
-[![code-coverage](http://gocover.io/_badge/github.com/prometheus/client_golang/api/prometheus/v1)](http://gocover.io/github.com/prometheus/client_golang/api/prometheus/v1) [![go-doc](https://godoc.org/github.com/prometheus/client_golang/api/prometheus?status.svg)](https://godoc.org/github.com/prometheus/client_golang/api)
+[![code-coverage](http://gocover.io/_badge/git.internal/re/client_golang/api/prometheus/v1)](http://gocover.io/git.internal/re/client_golang/api/prometheus/v1) [![Go Reference](https://pkg.go.dev/badge/git.internal/re/client_golang/api.svg)](https://pkg.go.dev/git.internal/re/client_golang/api)
 
 The
-[`api/prometheus` directory](https://github.com/prometheus/client_golang/tree/master/api/prometheus)
+[`api/prometheus` directory](https://git.internal/re/client_golang/tree/main/api/prometheus)
 contains the client for the
 [Prometheus HTTP API](http://prometheus.io/docs/querying/api/). It allows you
 to write Go applications that query time series data from a Prometheus
@@ -57,12 +58,35 @@ server. It is still in alpha stage.
 ## Where is `model`, `extraction`, and `text`?
 
 The `model` packages has been moved to
-[`prometheus/common/model`](https://github.com/prometheus/common/tree/master/model).
+[`prometheus/common/model`](https://github.com/prometheus/common/tree/main/model).
 
 The `extraction` and `text` packages are now contained in
-[`prometheus/common/expfmt`](https://github.com/prometheus/common/tree/master/expfmt).
+[`prometheus/common/expfmt`](https://github.com/prometheus/common/tree/main/expfmt).
 
 ## Contributing and community
 
 See the [contributing guidelines](CONTRIBUTING.md) and the
 [Community section](http://prometheus.io/community/) of the homepage.
+
+`clint_golang` community is also present on the CNCF Slack `#prometheus-client_golang`.
+
+### For Maintainers: Release Process
+
+To cut a minor version:
+
+1. Create a new branch `release-<major>.<minor>` on top of the `main` commit you want to cut the version from and push it.
+2. Create a new branch on top of the release branch, e.g. `<yourname>/cut-<major>.<minor>.<patch>`,
+3. Change the `VERSION` file.
+4. Update `CHANGELOG` (only user-impacting changes to mention).
+5. Create PR, and get it reviewed.
+6. Once merged, create a release with the `release-<major>.<minor>` tag on GitHub with the `<version> / <date>` title.
+7. Announce on the prometheus-announce mailing list, slack and Twitter.
+8. Merge the release branch back to the `main` using the "merge without squashing" approach (!).
+
+> NOTE: In case of merge conflicts, you can checkout the release branch in a new branch, e.g. <yourname>/resolve-conflicts`, fix the merge problems there, and then do a PR into main from the new branch. In that way, you still get all the commits in the release branch back into `main`, but leave the release branch alone.
+
+To cut the patch version:
+
+1. Create a branch on top of the release branch you want to use.
+2. Cherry-pick the fixes from the `main` branch (or add new commits) to fix critical bugs for that patch release.
+3. Follow steps 3-8 as above.

SECURITY.md

@@ -3,4 +3,4 @@
 The Prometheus security policy, including how to report vulnerabilities, can be
 found here:
 
-https://prometheus.io/docs/operating/security/
+<https://prometheus.io/docs/operating/security/>

VERSION

@@ -1 +1 @@
-1.11.0
+1.14.0

api/client.go

@@ -15,8 +15,9 @@
 package api
 
 import (
+	"bytes"
 	"context"
-	"io/ioutil"
+	"errors"
 	"net"
 	"net/http"
 	"net/url"
@@ -40,6 +41,10 @@ type Config struct {
 	// The address of the Prometheus to connect to.
 	Address string
 
+	// Client is used by the Client to drive HTTP requests. If not provided,
+	// a new one based on the provided RoundTripper (or DefaultRoundTripper) will be used.
+	Client *http.Client
+
 	// RoundTripper is used by the Client to drive HTTP requests. If not
 	// provided, DefaultRoundTripper will be used.
 	RoundTripper http.RoundTripper
@@ -52,6 +57,22 @@ func (cfg *Config) roundTripper() http.RoundTripper {
 	return cfg.RoundTripper
 }
 
+func (cfg *Config) client() http.Client {
+	if cfg.Client == nil {
+		return http.Client{
+			Transport: cfg.roundTripper(),
+		}
+	}
+	return *cfg.Client
+}
+
+func (cfg *Config) validate() error {
+	if cfg.Client != nil && cfg.RoundTripper != nil {
+		return errors.New("api.Config.RoundTripper and api.Config.Client are mutually exclusive")
+	}
+	return nil
+}
+
 // Client is the interface for an API client.
 type Client interface {
 	URL(ep string, args map[string]string) *url.URL
@@ -68,9 +89,13 @@ func NewClient(cfg Config) (Client, error) {
 	}
 	u.Path = strings.TrimRight(u.Path, "/")
 
+	if err := cfg.validate(); err != nil {
+		return nil, err
+	}
+
 	return &httpClient{
 		endpoint: u,
-		client:   http.Client{Transport: cfg.roundTripper()},
+		client:   cfg.client(),
 	}, nil
 }
 
@@ -84,7 +109,7 @@ func (c *httpClient) URL(ep string, args map[string]string) *url.URL {
 
 	for arg, val := range args {
 		arg = ":" + arg
-		p = strings.Replace(p, arg, val, -1)
+		p = strings.ReplaceAll(p, arg, val)
 	}
 
 	u := *c.endpoint
@@ -111,7 +136,9 @@ func (c *httpClient) Do(ctx context.Context, req *http.Request) (*http.Response,
 	var body []byte
 	done := make(chan struct{})
 	go func() {
-		body, err = ioutil.ReadAll(resp.Body)
+		var buf bytes.Buffer
+		_, err = buf.ReadFrom(resp.Body)
+		body = buf.Bytes()
 		close(done)
 	}()
 

api/client_test.go

@@ -14,7 +14,11 @@
 package api
 
 import (
+	"bytes"
+	"context"
+	"fmt"
 	"net/http"
+	"net/http/httptest"
 	"net/url"
 	"testing"
 )
@@ -111,3 +115,49 @@ func TestClientURL(t *testing.T) {
 		}
 	}
 }
+
+// Serve any http request with a response of N KB of spaces.
+type serveSpaces struct {
+	sizeKB int
+}
+
+func (t serveSpaces) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	kb := bytes.Repeat([]byte{' '}, 1024)
+	for i := 0; i < t.sizeKB; i++ {
+		w.Write(kb)
+	}
+}
+
+func BenchmarkClient(b *testing.B) {
+	b.ReportAllocs()
+	ctx := context.Background()
+
+	for _, sizeKB := range []int{4, 50, 1000, 2000} {
+		b.Run(fmt.Sprintf("%dKB", sizeKB), func(b *testing.B) {
+			testServer := httptest.NewServer(serveSpaces{sizeKB})
+			defer testServer.Close()
+
+			client, err := NewClient(Config{
+				Address: testServer.URL,
+			})
+			if err != nil {
+				b.Fatalf("Failed to initialize client: %v", err)
+			}
+			url, err := url.Parse(testServer.URL + "/prometheus/api/v1/query?query=up")
+			if err != nil {
+				b.Fatalf("Failed to parse url: %v", err)
+			}
+			req := &http.Request{
+				URL: url,
+			}
+			b.ResetTimer()
+			for i := 0; i < b.N; i++ {
+				_, _, err := client.Do(ctx, req)
+				if err != nil {
+					b.Fatalf("Query failed: %v", err)
+				}
+			}
+			b.StopTimer()
+		})
+	}
+}

api/prometheus/v1/api.go

@@ -31,7 +31,7 @@ import (
 
 	"github.com/prometheus/common/model"
 
-	"github.com/prometheus/client_golang/api"
+	"git.internal/re/client_golang/api"
 )
 
 func init() {
@@ -109,7 +109,6 @@ func marshalPointJSON(ptr unsafe.Pointer, stream *json.Stream) {
 
 	stream.WriteRaw(`"`)
 	stream.WriteArrayEnd()
-
 }
 
 func marshalPointJSONIsEmpty(ptr unsafe.Pointer) bool {
@@ -139,6 +138,7 @@ const (
 	epBuildinfo       = apiPrefix + "/status/buildinfo"
 	epRuntimeinfo     = apiPrefix + "/status/runtimeinfo"
 	epTSDB            = apiPrefix + "/status/tsdb"
+	epWalReplay       = apiPrefix + "/status/walreplay"
 )
 
 // AlertState models the state of an alert.
@@ -229,25 +229,25 @@ type API interface {
 	// Config returns the current Prometheus configuration.
 	Config(ctx context.Context) (ConfigResult, error)
 	// DeleteSeries deletes data for a selection of series in a time range.
-	DeleteSeries(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) error
+	DeleteSeries(ctx context.Context, matches []string, startTime, endTime time.Time) error
 	// Flags returns the flag values that Prometheus was launched with.
 	Flags(ctx context.Context) (FlagsResult, error)
 	// LabelNames returns the unique label names present in the block in sorted order by given time range and matchers.
-	LabelNames(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) ([]string, Warnings, error)
+	LabelNames(ctx context.Context, matches []string, startTime, endTime time.Time) ([]string, Warnings, error)
 	// LabelValues performs a query for the values of the given label, time range and matchers.
-	LabelValues(ctx context.Context, label string, matches []string, startTime time.Time, endTime time.Time) (model.LabelValues, Warnings, error)
+	LabelValues(ctx context.Context, label string, matches []string, startTime, endTime time.Time) (model.LabelValues, Warnings, error)
 	// Query performs a query for the given time.
-	Query(ctx context.Context, query string, ts time.Time) (model.Value, Warnings, error)
+	Query(ctx context.Context, query string, ts time.Time, opts ...Option) (model.Value, Warnings, error)
 	// QueryRange performs a query for the given range.
-	QueryRange(ctx context.Context, query string, r Range) (model.Value, Warnings, error)
+	QueryRange(ctx context.Context, query string, r Range, opts ...Option) (model.Value, Warnings, error)
 	// QueryExemplars performs a query for exemplars by the given query and time range.
-	QueryExemplars(ctx context.Context, query string, startTime time.Time, endTime time.Time) ([]ExemplarQueryResult, error)
+	QueryExemplars(ctx context.Context, query string, startTime, endTime time.Time) ([]ExemplarQueryResult, error)
 	// Buildinfo returns various build information properties about the Prometheus server
 	Buildinfo(ctx context.Context) (BuildinfoResult, error)
 	// Runtimeinfo returns the various runtime information properties about the Prometheus server.
 	Runtimeinfo(ctx context.Context) (RuntimeinfoResult, error)
 	// Series finds series by label matchers.
-	Series(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) ([]model.LabelSet, Warnings, error)
+	Series(ctx context.Context, matches []string, startTime, endTime time.Time) ([]model.LabelSet, Warnings, error)
 	// Snapshot creates a snapshot of all current data into snapshots/<datetime>-<rand>
 	// under the TSDB's data directory and returns the directory as response.
 	Snapshot(ctx context.Context, skipHead bool) (SnapshotResult, error)
@@ -256,11 +256,13 @@ type API interface {
 	// Targets returns an overview of the current state of the Prometheus target discovery.
 	Targets(ctx context.Context) (TargetsResult, error)
 	// TargetsMetadata returns metadata about metrics currently scraped by the target.
-	TargetsMetadata(ctx context.Context, matchTarget string, metric string, limit string) ([]MetricMetadata, error)
+	TargetsMetadata(ctx context.Context, matchTarget, metric, limit string) ([]MetricMetadata, error)
 	// Metadata returns metadata about metrics currently scraped by the metric name.
-	Metadata(ctx context.Context, metric string, limit string) (map[string][]Metadata, error)
+	Metadata(ctx context.Context, metric, limit string) (map[string][]Metadata, error)
 	// TSDB returns the cardinality statistics.
 	TSDB(ctx context.Context) (TSDBResult, error)
+	// WalReplay returns the current replay status of the wal.
+	WalReplay(ctx context.Context) (WalReplayStatus, error)
 }
 
 // AlertsResult contains the result from querying the alerts endpoint.
@@ -303,8 +305,6 @@ type RuntimeinfoResult struct {
 	CWD                 string    `json:"CWD"`
 	ReloadConfigSuccess bool      `json:"reloadConfigSuccess"`
 	LastConfigTime      time.Time `json:"lastConfigTime"`
-	ChunkCount          int       `json:"chunkCount"`
-	TimeSeriesCount     int       `json:"timeSeriesCount"`
 	CorruptionCount     int       `json:"corruptionCount"`
 	GoroutineCount      int       `json:"goroutineCount"`
 	GOMAXPROCS          int       `json:"GOMAXPROCS"`
@@ -335,14 +335,15 @@ type RuleGroup struct {
 // that rules are returned in by the API.
 //
 // Rule types can be determined using a type switch:
-//   switch v := rule.(type) {
-//   case RecordingRule:
-//   	fmt.Print("got a recording rule")
-//   case AlertingRule:
-//   	fmt.Print("got a alerting rule")
-//   default:
-//   	fmt.Printf("unknown rule type %s", v)
-//   }
+//
+//	switch v := rule.(type) {
+//	case RecordingRule:
+//		fmt.Print("got a recording rule")
+//	case AlertingRule:
+//		fmt.Print("got a alerting rule")
+//	default:
+//		fmt.Printf("unknown rule type %s", v)
+//	}
 type Rules []interface{}
 
 // AlertingRule models a alerting rule.
@@ -431,10 +432,27 @@ type queryResult struct {
 
 // TSDBResult contains the result from querying the tsdb endpoint.
 type TSDBResult struct {
-	SeriesCountByMetricName     []Stat `json:"seriesCountByMetricName"`
-	LabelValueCountByLabelName  []Stat `json:"labelValueCountByLabelName"`
-	MemoryInBytesByLabelName    []Stat `json:"memoryInBytesByLabelName"`
-	SeriesCountByLabelValuePair []Stat `json:"seriesCountByLabelValuePair"`
+	HeadStats                   TSDBHeadStats `json:"headStats"`
+	SeriesCountByMetricName     []Stat        `json:"seriesCountByMetricName"`
+	LabelValueCountByLabelName  []Stat        `json:"labelValueCountByLabelName"`
+	MemoryInBytesByLabelName    []Stat        `json:"memoryInBytesByLabelName"`
+	SeriesCountByLabelValuePair []Stat        `json:"seriesCountByLabelValuePair"`
+}
+
+// TSDBHeadStats contains TSDB stats
+type TSDBHeadStats struct {
+	NumSeries     int `json:"numSeries"`
+	NumLabelPairs int `json:"numLabelPairs"`
+	ChunkCount    int `json:"chunkCount"`
+	MinTime       int `json:"minTime"`
+	MaxTime       int `json:"maxTime"`
+}
+
+// WalReplayStatus represents the wal replay status.
+type WalReplayStatus struct {
+	Min     int `json:"min"`
+	Max     int `json:"max"`
+	Current int `json:"current"`
 }
 
 // Stat models information about statistic value.
@@ -681,7 +699,7 @@ func (h *httpAPI) Config(ctx context.Context) (ConfigResult, error) {
 	return res, json.Unmarshal(body, &res)
 }
 
-func (h *httpAPI) DeleteSeries(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) error {
+func (h *httpAPI) DeleteSeries(ctx context.Context, matches []string, startTime, endTime time.Time) error {
 	u := h.client.URL(epDeleteSeries, nil)
 	q := u.Query()
 
@@ -754,7 +772,7 @@ func (h *httpAPI) Runtimeinfo(ctx context.Context) (RuntimeinfoResult, error) {
 	return res, json.Unmarshal(body, &res)
 }
 
-func (h *httpAPI) LabelNames(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) ([]string, Warnings, error) {
+func (h *httpAPI) LabelNames(ctx context.Context, matches []string, startTime, endTime time.Time) ([]string, Warnings, error) {
 	u := h.client.URL(epLabels, nil)
 	q := u.Query()
 	q.Set("start", formatTime(startTime))
@@ -777,7 +795,7 @@ func (h *httpAPI) LabelNames(ctx context.Context, matches []string, startTime ti
 	return labelNames, w, json.Unmarshal(body, &labelNames)
 }
 
-func (h *httpAPI) LabelValues(ctx context.Context, label string, matches []string, startTime time.Time, endTime time.Time) (model.LabelValues, Warnings, error) {
+func (h *httpAPI) LabelValues(ctx context.Context, label string, matches []string, startTime, endTime time.Time) (model.LabelValues, Warnings, error) {
 	u := h.client.URL(epLabelValues, map[string]string{"name": label})
 	q := u.Query()
 	q.Set("start", formatTime(startTime))
@@ -800,10 +818,34 @@ func (h *httpAPI) LabelValues(ctx context.Context, label string, matches []strin
 	return labelValues, w, json.Unmarshal(body, &labelValues)
 }
 
-func (h *httpAPI) Query(ctx context.Context, query string, ts time.Time) (model.Value, Warnings, error) {
+type apiOptions struct {
+	timeout time.Duration
+}
+
+type Option func(c *apiOptions)
+
+// WithTimeout can be used to provide an optional query evaluation timeout for Query and QueryRange.
+// https://prometheus.io/docs/prometheus/latest/querying/api/#instant-queries
+func WithTimeout(timeout time.Duration) Option {
+	return func(o *apiOptions) {
+		o.timeout = timeout
+	}
+}
+
+func (h *httpAPI) Query(ctx context.Context, query string, ts time.Time, opts ...Option) (model.Value, Warnings, error) {
 	u := h.client.URL(epQuery, nil)
 	q := u.Query()
 
+	opt := &apiOptions{}
+	for _, o := range opts {
+		o(opt)
+	}
+
+	d := opt.timeout
+	if d > 0 {
+		q.Set("timeout", d.String())
+	}
+
 	q.Set("query", query)
 	if !ts.IsZero() {
 		q.Set("time", formatTime(ts))
@@ -815,10 +857,10 @@ func (h *httpAPI) Query(ctx context.Context, query string, ts time.Time) (model.
 	}
 
 	var qres queryResult
-	return model.Value(qres.v), warnings, json.Unmarshal(body, &qres)
+	return qres.v, warnings, json.Unmarshal(body, &qres)
 }
 
-func (h *httpAPI) QueryRange(ctx context.Context, query string, r Range) (model.Value, Warnings, error) {
+func (h *httpAPI) QueryRange(ctx context.Context, query string, r Range, opts ...Option) (model.Value, Warnings, error) {
 	u := h.client.URL(epQueryRange, nil)
 	q := u.Query()
 
@@ -827,6 +869,16 @@ func (h *httpAPI) QueryRange(ctx context.Context, query string, r Range) (model.
 	q.Set("end", formatTime(r.End))
 	q.Set("step", strconv.FormatFloat(r.Step.Seconds(), 'f', -1, 64))
 
+	opt := &apiOptions{}
+	for _, o := range opts {
+		o(opt)
+	}
+
+	d := opt.timeout
+	if d > 0 {
+		q.Set("timeout", d.String())
+	}
+
 	_, body, warnings, err := h.client.DoGetFallback(ctx, u, q)
 	if err != nil {
 		return nil, warnings, err
@@ -834,10 +886,10 @@ func (h *httpAPI) QueryRange(ctx context.Context, query string, r Range) (model.
 
 	var qres queryResult
 
-	return model.Value(qres.v), warnings, json.Unmarshal(body, &qres)
+	return qres.v, warnings, json.Unmarshal(body, &qres)
 }
 
-func (h *httpAPI) Series(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) ([]model.LabelSet, Warnings, error) {
+func (h *httpAPI) Series(ctx context.Context, matches []string, startTime, endTime time.Time) ([]model.LabelSet, Warnings, error) {
 	u := h.client.URL(epSeries, nil)
 	q := u.Query()
 
@@ -920,7 +972,7 @@ func (h *httpAPI) Targets(ctx context.Context) (TargetsResult, error) {
 	return res, json.Unmarshal(body, &res)
 }
 
-func (h *httpAPI) TargetsMetadata(ctx context.Context, matchTarget string, metric string, limit string) ([]MetricMetadata, error) {
+func (h *httpAPI) TargetsMetadata(ctx context.Context, matchTarget, metric, limit string) ([]MetricMetadata, error) {
 	u := h.client.URL(epTargetsMetadata, nil)
 	q := u.Query()
 
@@ -944,7 +996,7 @@ func (h *httpAPI) TargetsMetadata(ctx context.Context, matchTarget string, metri
 	return res, json.Unmarshal(body, &res)
 }
 
-func (h *httpAPI) Metadata(ctx context.Context, metric string, limit string) (map[string][]Metadata, error) {
+func (h *httpAPI) Metadata(ctx context.Context, metric, limit string) (map[string][]Metadata, error) {
 	u := h.client.URL(epMetadata, nil)
 	q := u.Query()
 
@@ -984,7 +1036,24 @@ func (h *httpAPI) TSDB(ctx context.Context) (TSDBResult, error) {
 	return res, json.Unmarshal(body, &res)
 }
 
-func (h *httpAPI) QueryExemplars(ctx context.Context, query string, startTime time.Time, endTime time.Time) ([]ExemplarQueryResult, error) {
+func (h *httpAPI) WalReplay(ctx context.Context) (WalReplayStatus, error) {
+	u := h.client.URL(epWalReplay, nil)
+
+	req, err := http.NewRequest(http.MethodGet, u.String(), nil)
+	if err != nil {
+		return WalReplayStatus{}, err
+	}
+
+	_, body, _, err := h.client.Do(ctx, req)
+	if err != nil {
+		return WalReplayStatus{}, err
+	}
+
+	var res WalReplayStatus
+	return res, json.Unmarshal(body, &res)
+}
+
+func (h *httpAPI) QueryExemplars(ctx context.Context, query string, startTime, endTime time.Time) ([]ExemplarQueryResult, error) {
 	u := h.client.URL(epQueryExemplars, nil)
 	q := u.Query()
 
@@ -1092,33 +1161,36 @@ func (h *apiClientImpl) Do(ctx context.Context, req *http.Request) (*http.Respon
 	}
 
 	return resp, []byte(result.Data), result.Warnings, err
-
 }
 
 // DoGetFallback will attempt to do the request as-is, and on a 405 or 501 it
 // will fallback to a GET request.
 func (h *apiClientImpl) DoGetFallback(ctx context.Context, u *url.URL, args url.Values) (*http.Response, []byte, Warnings, error) {
-	req, err := http.NewRequest(http.MethodPost, u.String(), strings.NewReader(args.Encode()))
+	encodedArgs := args.Encode()
+	req, err := http.NewRequest(http.MethodPost, u.String(), strings.NewReader(encodedArgs))
 	if err != nil {
 		return nil, nil, nil, err
 	}
 	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	// Following comment originates from https://pkg.go.dev/net/http#Transport
+	// Transport only retries a request upon encountering a network error if the request is
+	// idempotent and either has no body or has its Request.GetBody defined. HTTP requests
+	// are considered idempotent if they have HTTP methods GET, HEAD, OPTIONS, or TRACE; or
+	// if their Header map contains an "Idempotency-Key" or "X-Idempotency-Key" entry. If the
+	// idempotency key value is a zero-length slice, the request is treated as idempotent but
+	// the header is not sent on the wire.
+	req.Header["Idempotency-Key"] = nil
 
 	resp, body, warnings, err := h.Do(ctx, req)
 	if resp != nil && (resp.StatusCode == http.StatusMethodNotAllowed || resp.StatusCode == http.StatusNotImplemented) {
-		u.RawQuery = args.Encode()
+		u.RawQuery = encodedArgs
 		req, err = http.NewRequest(http.MethodGet, u.String(), nil)
 		if err != nil {
 			return nil, nil, warnings, err
 		}
-
-	} else {
-		if err != nil {
-			return resp, body, warnings, err
-		}
-		return resp, body, warnings, nil
+		return h.Do(ctx, req)
 	}
-	return h.Do(ctx, req)
+	return resp, body, warnings, err
 }
 
 func formatTime(t time.Time) string {

api/prometheus/v1/api_test.go

@@ -17,7 +17,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"math"
 	"net/http"
 	"net/http/httptest"
@@ -40,10 +40,8 @@ type apiTest struct {
 	inRes        interface{}
 
 	reqPath   string
-	reqParam  url.Values
 	reqMethod string
 	res       interface{}
-	warnings  Warnings
 	err       error
 }
 
@@ -55,7 +53,7 @@ type apiTestClient struct {
 func (c *apiTestClient) URL(ep string, args map[string]string) *url.URL {
 	path := ep
 	for k, v := range args {
-		path = strings.Replace(path, ":"+k, v, -1)
+		path = strings.ReplaceAll(path, ":"+k, v)
 	}
 	u := &url.URL{
 		Host: "test:9090",
@@ -64,8 +62,7 @@ func (c *apiTestClient) URL(ep string, args map[string]string) *url.URL {
 	return u
 }
 
-func (c *apiTestClient) Do(ctx context.Context, req *http.Request) (*http.Response, []byte, Warnings, error) {
-
+func (c *apiTestClient) Do(_ context.Context, req *http.Request) (*http.Response, []byte, Warnings, error) {
 	test := c.curTest
 
 	if req.URL.Path != test.reqPath {
@@ -101,7 +98,6 @@ func (c *apiTestClient) DoGetFallback(ctx context.Context, u *url.URL, args url.
 }
 
 func TestAPIs(t *testing.T) {
-
 	testTime := time.Now()
 
 	tc := &apiTestClient{
@@ -131,7 +127,7 @@ func TestAPIs(t *testing.T) {
 		}
 	}
 
-	doDeleteSeries := func(matcher string, startTime time.Time, endTime time.Time) func() (interface{}, Warnings, error) {
+	doDeleteSeries := func(matcher string, startTime, endTime time.Time) func() (interface{}, Warnings, error) {
 		return func() (interface{}, Warnings, error) {
 			return nil, nil, promAPI.DeleteSeries(context.Background(), []string{matcher}, startTime, endTime)
 		}
@@ -158,31 +154,31 @@ func TestAPIs(t *testing.T) {
 		}
 	}
 
-	doLabelNames := func(matches []string) func() (interface{}, Warnings, error) {
+	doLabelNames := func(matches []string, startTime, endTime time.Time) func() (interface{}, Warnings, error) {
 		return func() (interface{}, Warnings, error) {
-			return promAPI.LabelNames(context.Background(), matches, time.Now().Add(-100*time.Hour), time.Now())
+			return promAPI.LabelNames(context.Background(), matches, startTime, endTime)
 		}
 	}
 
-	doLabelValues := func(matches []string, label string) func() (interface{}, Warnings, error) {
+	doLabelValues := func(matches []string, label string, startTime, endTime time.Time) func() (interface{}, Warnings, error) {
 		return func() (interface{}, Warnings, error) {
-			return promAPI.LabelValues(context.Background(), label, matches, time.Now().Add(-100*time.Hour), time.Now())
+			return promAPI.LabelValues(context.Background(), label, matches, startTime, endTime)
 		}
 	}
 
-	doQuery := func(q string, ts time.Time) func() (interface{}, Warnings, error) {
+	doQuery := func(q string, ts time.Time, opts ...Option) func() (interface{}, Warnings, error) {
 		return func() (interface{}, Warnings, error) {
-			return promAPI.Query(context.Background(), q, ts)
+			return promAPI.Query(context.Background(), q, ts, opts...)
 		}
 	}
 
-	doQueryRange := func(q string, rng Range) func() (interface{}, Warnings, error) {
+	doQueryRange := func(q string, rng Range, opts ...Option) func() (interface{}, Warnings, error) {
 		return func() (interface{}, Warnings, error) {
-			return promAPI.QueryRange(context.Background(), q, rng)
+			return promAPI.QueryRange(context.Background(), q, rng, opts...)
 		}
 	}
 
-	doSeries := func(matcher string, startTime time.Time, endTime time.Time) func() (interface{}, Warnings, error) {
+	doSeries := func(matcher string, startTime, endTime time.Time) func() (interface{}, Warnings, error) {
 		return func() (interface{}, Warnings, error) {
 			return promAPI.Series(context.Background(), []string{matcher}, startTime, endTime)
 		}
@@ -209,14 +205,14 @@ func TestAPIs(t *testing.T) {
 		}
 	}
 
-	doTargetsMetadata := func(matchTarget string, metric string, limit string) func() (interface{}, Warnings, error) {
+	doTargetsMetadata := func(matchTarget, metric, limit string) func() (interface{}, Warnings, error) {
 		return func() (interface{}, Warnings, error) {
 			v, err := promAPI.TargetsMetadata(context.Background(), matchTarget, metric, limit)
 			return v, nil, err
 		}
 	}
 
-	doMetadata := func(metric string, limit string) func() (interface{}, Warnings, error) {
+	doMetadata := func(metric, limit string) func() (interface{}, Warnings, error) {
 		return func() (interface{}, Warnings, error) {
 			v, err := promAPI.Metadata(context.Background(), metric, limit)
 			return v, nil, err
@@ -230,7 +226,14 @@ func TestAPIs(t *testing.T) {
 		}
 	}
 
-	doQueryExemplars := func(query string, startTime time.Time, endTime time.Time) func() (interface{}, Warnings, error) {
+	doWalReply := func() func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
+			v, err := promAPI.WalReplay(context.Background())
+			return v, nil, err
+		}
+	}
+
+	doQueryExemplars := func(query string, startTime, endTime time.Time) func() (interface{}, Warnings, error) {
 		return func() (interface{}, Warnings, error) {
 			v, err := promAPI.QueryExemplars(context.Background(), query, startTime, endTime)
 			return v, nil, err
@@ -239,7 +242,7 @@ func TestAPIs(t *testing.T) {
 
 	queryTests := []apiTest{
 		{
-			do: doQuery("2", testTime),
+			do: doQuery("2", testTime, WithTimeout(5*time.Second)),
 			inRes: &queryResult{
 				Type: model.ValScalar,
 				Result: &model.Scalar{
@@ -250,10 +253,6 @@ func TestAPIs(t *testing.T) {
 
 			reqMethod: "POST",
 			reqPath:   "/api/v1/query",
-			reqParam: url.Values{
-				"query": []string{"2"},
-				"time":  []string{testTime.Format(time.RFC3339Nano)},
-			},
 			res: &model.Scalar{
 				Value:     2,
 				Timestamp: model.TimeFromUnix(testTime.Unix()),
@@ -265,11 +264,7 @@ func TestAPIs(t *testing.T) {
 
 			reqMethod: "POST",
 			reqPath:   "/api/v1/query",
-			reqParam: url.Values{
-				"query": []string{"2"},
-				"time":  []string{testTime.Format(time.RFC3339Nano)},
-			},
-			err: fmt.Errorf("some error"),
+			err:       errors.New("some error"),
 		},
 		{
 			do:           doQuery("2", testTime),
@@ -283,11 +278,7 @@ func TestAPIs(t *testing.T) {
 
 			reqMethod: "POST",
 			reqPath:   "/api/v1/query",
-			reqParam: url.Values{
-				"query": []string{"2"},
-				"time":  []string{testTime.Format(time.RFC3339Nano)},
-			},
-			err: errors.New("server_error: server error: 500"),
+			err:       errors.New("server_error: server error: 500"),
 		},
 		{
 			do:           doQuery("2", testTime),
@@ -301,11 +292,7 @@ func TestAPIs(t *testing.T) {
 
 			reqMethod: "POST",
 			reqPath:   "/api/v1/query",
-			reqParam: url.Values{
-				"query": []string{"2"},
-				"time":  []string{testTime.Format(time.RFC3339Nano)},
-			},
-			err: errors.New("client_error: client error: 404"),
+			err:       errors.New("client_error: client error: 404"),
 		},
 		// Warning only.
 		{
@@ -321,15 +308,10 @@ func TestAPIs(t *testing.T) {
 
 			reqMethod: "POST",
 			reqPath:   "/api/v1/query",
-			reqParam: url.Values{
-				"query": []string{"2"},
-				"time":  []string{testTime.Format(time.RFC3339Nano)},
-			},
 			res: &model.Scalar{
 				Value:     2,
 				Timestamp: model.TimeFromUnix(testTime.Unix()),
 			},
-			warnings: []string{"warning"},
 		},
 		// Warning + error.
 		{
@@ -345,114 +327,97 @@ func TestAPIs(t *testing.T) {
 
 			reqMethod: "POST",
 			reqPath:   "/api/v1/query",
-			reqParam: url.Values{
-				"query": []string{"2"},
-				"time":  []string{testTime.Format(time.RFC3339Nano)},
-			},
-			err:      errors.New("client_error: client error: 404"),
-			warnings: []string{"warning"},
+			err:       errors.New("client_error: client error: 404"),
 		},
 
 		{
 			do: doQueryRange("2", Range{
 				Start: testTime.Add(-time.Minute),
 				End:   testTime,
-				Step:  time.Minute,
-			}),
+				Step:  1 * time.Minute,
+			}, WithTimeout(5*time.Second)),
 			inErr: fmt.Errorf("some error"),
 
 			reqMethod: "POST",
 			reqPath:   "/api/v1/query_range",
-			reqParam: url.Values{
-				"query": []string{"2"},
-				"start": []string{testTime.Add(-time.Minute).Format(time.RFC3339Nano)},
-				"end":   []string{testTime.Format(time.RFC3339Nano)},
-				"step":  []string{time.Minute.String()},
-			},
-			err: fmt.Errorf("some error"),
+			err:       errors.New("some error"),
 		},
 
 		{
-			do:        doLabelNames(nil),
+			do:        doLabelNames(nil, testTime.Add(-100*time.Hour), testTime),
 			inRes:     []string{"val1", "val2"},
 			reqMethod: "GET",
 			reqPath:   "/api/v1/labels",
 			res:       []string{"val1", "val2"},
 		},
 		{
-			do:         doLabelNames(nil),
+			do:         doLabelNames(nil, testTime.Add(-100*time.Hour), testTime),
 			inRes:      []string{"val1", "val2"},
 			inWarnings: []string{"a"},
 			reqMethod:  "GET",
 			reqPath:    "/api/v1/labels",
 			res:        []string{"val1", "val2"},
-			warnings:   []string{"a"},
 		},
 
 		{
-			do:        doLabelNames(nil),
+			do:        doLabelNames(nil, testTime.Add(-100*time.Hour), testTime),
 			inErr:     fmt.Errorf("some error"),
 			reqMethod: "GET",
 			reqPath:   "/api/v1/labels",
-			err:       fmt.Errorf("some error"),
+			err:       errors.New("some error"),
 		},
 		{
-			do:         doLabelNames(nil),
+			do:         doLabelNames(nil, testTime.Add(-100*time.Hour), testTime),
 			inErr:      fmt.Errorf("some error"),
 			inWarnings: []string{"a"},
 			reqMethod:  "GET",
 			reqPath:    "/api/v1/labels",
-			err:        fmt.Errorf("some error"),
-			warnings:   []string{"a"},
+			err:        errors.New("some error"),
 		},
 		{
-			do:        doLabelNames([]string{"up"}),
+			do:        doLabelNames([]string{"up"}, testTime.Add(-100*time.Hour), testTime),
 			inRes:     []string{"val1", "val2"},
 			reqMethod: "GET",
 			reqPath:   "/api/v1/labels",
-			reqParam:  url.Values{"match[]": {"up"}},
 			res:       []string{"val1", "val2"},
 		},
 
 		{
-			do:        doLabelValues(nil, "mylabel"),
+			do:        doLabelValues(nil, "mylabel", testTime.Add(-100*time.Hour), testTime),
 			inRes:     []string{"val1", "val2"},
 			reqMethod: "GET",
 			reqPath:   "/api/v1/label/mylabel/values",
 			res:       model.LabelValues{"val1", "val2"},
 		},
 		{
-			do:         doLabelValues(nil, "mylabel"),
+			do:         doLabelValues(nil, "mylabel", testTime.Add(-100*time.Hour), testTime),
 			inRes:      []string{"val1", "val2"},
 			inWarnings: []string{"a"},
 			reqMethod:  "GET",
 			reqPath:    "/api/v1/label/mylabel/values",
 			res:        model.LabelValues{"val1", "val2"},
-			warnings:   []string{"a"},
 		},
 
 		{
-			do:        doLabelValues(nil, "mylabel"),
+			do:        doLabelValues(nil, "mylabel", testTime.Add(-100*time.Hour), testTime),
 			inErr:     fmt.Errorf("some error"),
 			reqMethod: "GET",
 			reqPath:   "/api/v1/label/mylabel/values",
-			err:       fmt.Errorf("some error"),
+			err:       errors.New("some error"),
 		},
 		{
-			do:         doLabelValues(nil, "mylabel"),
+			do:         doLabelValues(nil, "mylabel", testTime.Add(-100*time.Hour), testTime),
 			inErr:      fmt.Errorf("some error"),
 			inWarnings: []string{"a"},
 			reqMethod:  "GET",
 			reqPath:    "/api/v1/label/mylabel/values",
-			err:        fmt.Errorf("some error"),
-			warnings:   []string{"a"},
+			err:        errors.New("some error"),
 		},
 		{
-			do:        doLabelValues([]string{"up"}, "mylabel"),
+			do:        doLabelValues([]string{"up"}, "mylabel", testTime.Add(-100*time.Hour), testTime),
 			inRes:     []string{"val1", "val2"},
 			reqMethod: "GET",
 			reqPath:   "/api/v1/label/mylabel/values",
-			reqParam:  url.Values{"match[]": {"up"}},
 			res:       model.LabelValues{"val1", "val2"},
 		},
 
@@ -462,15 +427,11 @@ func TestAPIs(t *testing.T) {
 				{
 					"__name__": "up",
 					"job":      "prometheus",
-					"instance": "localhost:9090"},
+					"instance": "localhost:9090",
+				},
 			},
 			reqMethod: "GET",
 			reqPath:   "/api/v1/series",
-			reqParam: url.Values{
-				"match": []string{"up"},
-				"start": []string{testTime.Add(-time.Minute).Format(time.RFC3339Nano)},
-				"end":   []string{testTime.Format(time.RFC3339Nano)},
-			},
 			res: []model.LabelSet{
 				{
 					"__name__": "up",
@@ -486,16 +447,12 @@ func TestAPIs(t *testing.T) {
 				{
 					"__name__": "up",
 					"job":      "prometheus",
-					"instance": "localhost:9090"},
+					"instance": "localhost:9090",
+				},
 			},
 			inWarnings: []string{"a"},
 			reqMethod:  "GET",
 			reqPath:    "/api/v1/series",
-			reqParam: url.Values{
-				"match": []string{"up"},
-				"start": []string{testTime.Add(-time.Minute).Format(time.RFC3339Nano)},
-				"end":   []string{testTime.Format(time.RFC3339Nano)},
-			},
 			res: []model.LabelSet{
 				{
 					"__name__": "up",
@@ -503,7 +460,6 @@ func TestAPIs(t *testing.T) {
 					"instance": "localhost:9090",
 				},
 			},
-			warnings: []string{"a"},
 		},
 
 		{
@@ -511,12 +467,7 @@ func TestAPIs(t *testing.T) {
 			inErr:     fmt.Errorf("some error"),
 			reqMethod: "GET",
 			reqPath:   "/api/v1/series",
-			reqParam: url.Values{
-				"match": []string{"up"},
-				"start": []string{testTime.Add(-time.Minute).Format(time.RFC3339Nano)},
-				"end":   []string{testTime.Format(time.RFC3339Nano)},
-			},
-			err: fmt.Errorf("some error"),
+			err:       errors.New("some error"),
 		},
 		// Series with error and warning.
 		{
@@ -525,13 +476,7 @@ func TestAPIs(t *testing.T) {
 			inWarnings: []string{"a"},
 			reqMethod:  "GET",
 			reqPath:    "/api/v1/series",
-			reqParam: url.Values{
-				"match": []string{"up"},
-				"start": []string{testTime.Add(-time.Minute).Format(time.RFC3339Nano)},
-				"end":   []string{testTime.Format(time.RFC3339Nano)},
-			},
-			err:      fmt.Errorf("some error"),
-			warnings: []string{"a"},
+			err:        errors.New("some error"),
 		},
 
 		{
@@ -541,9 +486,6 @@ func TestAPIs(t *testing.T) {
 			},
 			reqMethod: "POST",
 			reqPath:   "/api/v1/admin/tsdb/snapshot",
-			reqParam: url.Values{
-				"skip_head": []string{"true"},
-			},
 			res: SnapshotResult{
 				Name: "20171210T211224Z-2be650b6d019eb54",
 			},
@@ -554,7 +496,7 @@ func TestAPIs(t *testing.T) {
 			inErr:     fmt.Errorf("some error"),
 			reqMethod: "POST",
 			reqPath:   "/api/v1/admin/tsdb/snapshot",
-			err:       fmt.Errorf("some error"),
+			err:       errors.New("some error"),
 		},
 
 		{
@@ -568,7 +510,7 @@ func TestAPIs(t *testing.T) {
 			inErr:     fmt.Errorf("some error"),
 			reqMethod: "POST",
 			reqPath:   "/api/v1/admin/tsdb/clean_tombstones",
-			err:       fmt.Errorf("some error"),
+			err:       errors.New("some error"),
 		},
 
 		{
@@ -577,15 +519,11 @@ func TestAPIs(t *testing.T) {
 				{
 					"__name__": "up",
 					"job":      "prometheus",
-					"instance": "localhost:9090"},
+					"instance": "localhost:9090",
+				},
 			},
 			reqMethod: "POST",
 			reqPath:   "/api/v1/admin/tsdb/delete_series",
-			reqParam: url.Values{
-				"match": []string{"up"},
-				"start": []string{testTime.Add(-time.Minute).Format(time.RFC3339Nano)},
-				"end":   []string{testTime.Format(time.RFC3339Nano)},
-			},
 		},
 
 		{
@@ -593,12 +531,7 @@ func TestAPIs(t *testing.T) {
 			inErr:     fmt.Errorf("some error"),
 			reqMethod: "POST",
 			reqPath:   "/api/v1/admin/tsdb/delete_series",
-			reqParam: url.Values{
-				"match": []string{"up"},
-				"start": []string{testTime.Add(-time.Minute).Format(time.RFC3339Nano)},
-				"end":   []string{testTime.Format(time.RFC3339Nano)},
-			},
-			err: fmt.Errorf("some error"),
+			err:       errors.New("some error"),
 		},
 
 		{
@@ -696,8 +629,6 @@ func TestAPIs(t *testing.T) {
 				"CWD":                 "/prometheus",
 				"reloadConfigSuccess": true,
 				"lastConfigTime":      "2020-05-18T15:52:56Z",
-				"chunkCount":          72692,
-				"timeSeriesCount":     18476,
 				"corruptionCount":     0,
 				"goroutineCount":      217,
 				"GOMAXPROCS":          2,
@@ -710,8 +641,6 @@ func TestAPIs(t *testing.T) {
 				CWD:                 "/prometheus",
 				ReloadConfigSuccess: true,
 				LastConfigTime:      time.Date(2020, 5, 18, 15, 52, 56, 0, time.UTC),
-				ChunkCount:          72692,
-				TimeSeriesCount:     18476,
 				CorruptionCount:     0,
 				GoroutineCount:      217,
 				GOMAXPROCS:          2,
@@ -1061,11 +990,6 @@ func TestAPIs(t *testing.T) {
 			},
 			reqMethod: "GET",
 			reqPath:   "/api/v1/targets/metadata",
-			reqParam: url.Values{
-				"match_target": []string{"{job=\"prometheus\"}"},
-				"metric":       []string{"go_goroutines"},
-				"limit":        []string{"1"},
-			},
 			res: []MetricMetadata{
 				{
 					Target: map[string]string{
@@ -1084,12 +1008,7 @@ func TestAPIs(t *testing.T) {
 			inErr:     fmt.Errorf("some error"),
 			reqMethod: "GET",
 			reqPath:   "/api/v1/targets/metadata",
-			reqParam: url.Values{
-				"match_target": []string{"{job=\"prometheus\"}"},
-				"metric":       []string{"go_goroutines"},
-				"limit":        []string{"1"},
-			},
-			err: fmt.Errorf("some error"),
+			err:       errors.New("some error"),
 		},
 
 		{
@@ -1105,12 +1024,8 @@ func TestAPIs(t *testing.T) {
 			},
 			reqMethod: "GET",
 			reqPath:   "/api/v1/metadata",
-			reqParam: url.Values{
-				"metric": []string{"go_goroutines"},
-				"limit":  []string{"1"},
-			},
 			res: map[string][]Metadata{
-				"go_goroutines": []Metadata{
+				"go_goroutines": {
 					{
 						Type: "gauge",
 						Help: "Number of goroutines that currently exist.",
@@ -1125,11 +1040,7 @@ func TestAPIs(t *testing.T) {
 			inErr:     fmt.Errorf("some error"),
 			reqMethod: "GET",
 			reqPath:   "/api/v1/metadata",
-			reqParam: url.Values{
-				"metric": []string{""},
-				"limit":  []string{"1"},
-			},
-			err: fmt.Errorf("some error"),
+			err:       errors.New("some error"),
 		},
 
 		{
@@ -1145,6 +1056,13 @@ func TestAPIs(t *testing.T) {
 			reqMethod: "GET",
 			reqPath:   "/api/v1/status/tsdb",
 			inRes: map[string]interface{}{
+				"headStats": map[string]interface{}{
+					"numSeries":     18476,
+					"numLabelPairs": 4301,
+					"chunkCount":    72692,
+					"minTime":       1634644800304,
+					"maxTime":       1634650590304,
+				},
 				"seriesCountByMetricName": []interface{}{
 					map[string]interface{}{
 						"name":  "kubelet_http_requests_duration_seconds_bucket",
@@ -1171,6 +1089,13 @@ func TestAPIs(t *testing.T) {
 				},
 			},
 			res: TSDBResult{
+				HeadStats: TSDBHeadStats{
+					NumSeries:     18476,
+					NumLabelPairs: 4301,
+					ChunkCount:    72692,
+					MinTime:       1634644800304,
+					MaxTime:       1634650590304,
+				},
 				SeriesCountByMetricName: []Stat{
 					{
 						Name:  "kubelet_http_requests_duration_seconds_bucket",
@@ -1198,12 +1123,36 @@ func TestAPIs(t *testing.T) {
 			},
 		},
 
+		{
+			do:        doWalReply(),
+			reqMethod: "GET",
+			reqPath:   "/api/v1/status/walreplay",
+			inErr:     fmt.Errorf("some error"),
+			err:       fmt.Errorf("some error"),
+		},
+
+		{
+			do:        doWalReply(),
+			reqMethod: "GET",
+			reqPath:   "/api/v1/status/walreplay",
+			inRes: map[string]interface{}{
+				"min":     2,
+				"max":     5,
+				"current": 40,
+			},
+			res: WalReplayStatus{
+				Min:     2,
+				Max:     5,
+				Current: 40,
+			},
+		},
+
 		{
 			do:        doQueryExemplars("tns_request_duration_seconds_bucket", testTime.Add(-1*time.Minute), testTime),
 			reqMethod: "GET",
 			reqPath:   "/api/v1/query_exemplars",
-			inErr:     fmt.Errorf("some error"),
-			err:       fmt.Errorf("some error"),
+			inErr:     errors.New("some error"),
+			err:       errors.New("some error"),
 		},
 
 		{
@@ -1279,7 +1228,9 @@ func TestAPIs(t *testing.T) {
 				if err.Error() != test.err.Error() {
 					t.Errorf("unexpected error: want %s, got %s", test.err, err)
 				}
-				if apiErr, ok := err.(*Error); ok {
+
+				apiErr := &Error{}
+				if ok := errors.As(err, &apiErr); ok {
 					if apiErr.Detail != test.inRes {
 						t.Errorf("%q should be %q", apiErr.Detail, test.inRes)
 					}
@@ -1480,7 +1431,6 @@ func TestAPIClientDo(t *testing.T) {
 
 	for i, test := range tests {
 		t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
-
 			tc.ch <- test
 
 			_, body, warnings, err := client.Do(context.Background(), tc.req)
@@ -1505,9 +1455,13 @@ func TestAPIClientDo(t *testing.T) {
 				}
 
 				if test.expectedErr.Detail != "" {
-					apiErr := err.(*Error)
-					if apiErr.Detail != test.expectedErr.Detail {
-						t.Fatalf("expected error detail :%v, but got:%v", apiErr.Detail, test.expectedErr.Detail)
+					apiErr := &Error{}
+					if errors.As(err, &apiErr) {
+						if apiErr.Detail != test.expectedErr.Detail {
+							t.Fatalf("expected error detail :%v, but got:%v", apiErr.Detail, test.expectedErr.Detail)
+						}
+					} else {
+						t.Fatalf("expected v1.Error instance, but got:%T", err)
 					}
 				}
 
@@ -1521,7 +1475,6 @@ func TestAPIClientDo(t *testing.T) {
 				t.Fatalf("expected body :%v, but got:%v", test.expectedBody, string(body))
 			}
 		})
-
 	}
 }
 
@@ -1638,7 +1591,7 @@ func (c *httpTestClient) Do(ctx context.Context, req *http.Request) (*http.Respo
 	var body []byte
 	done := make(chan struct{})
 	go func() {
-		body, err = ioutil.ReadAll(resp.Body)
+		body, err = io.ReadAll(resp.Body)
 		close(done)
 	}()
 

api/prometheus/v1/example_test.go

@@ -22,9 +22,10 @@ import (
 	"os"
 	"time"
 
-	"github.com/prometheus/client_golang/api"
-	v1 "github.com/prometheus/client_golang/api/prometheus/v1"
 	"github.com/prometheus/common/config"
+
+	"git.internal/re/client_golang/api"
+	v1 "git.internal/re/client_golang/api/prometheus/v1"
 )
 
 func ExampleAPI_query() {
@@ -39,7 +40,7 @@ func ExampleAPI_query() {
 	v1api := v1.NewAPI(client)
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 	defer cancel()
-	result, warnings, err := v1api.Query(ctx, "up", time.Now())
+	result, warnings, err := v1api.Query(ctx, "up", time.Now(), v1.WithTimeout(5*time.Second))
 	if err != nil {
 		fmt.Printf("Error querying Prometheus: %v\n", err)
 		os.Exit(1)
@@ -67,7 +68,7 @@ func ExampleAPI_queryRange() {
 		End:   time.Now(),
 		Step:  time.Minute,
 	}
-	result, warnings, err := v1api.QueryRange(ctx, "rate(prometheus_tsdb_head_samples_appended_total[5m])", r)
+	result, warnings, err := v1api.QueryRange(ctx, "rate(prometheus_tsdb_head_samples_appended_total[5m])", r, v1.WithTimeout(5*time.Second))
 	if err != nil {
 		fmt.Printf("Error querying Prometheus: %v\n", err)
 		os.Exit(1)

examples/exemplars/main.go

@@ -0,0 +1,69 @@
+// Copyright 2022 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// A simple example of how to record a latency metric with exemplars, using a fictional id
+// as a prometheus label.
+
+package main
+
+import (
+	"fmt"
+	"log"
+	"math/rand"
+	"net/http"
+	"time"
+
+	"git.internal/re/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus/collectors"
+	"git.internal/re/client_golang/prometheus/promhttp"
+)
+
+func main() {
+	requestDurations := prometheus.NewHistogram(prometheus.HistogramOpts{
+		Name:    "http_request_duration_seconds",
+		Help:    "A histogram of the HTTP request durations in seconds.",
+		Buckets: prometheus.ExponentialBuckets(0.1, 1.5, 5),
+	})
+
+	// Create non-global registry.
+	registry := prometheus.NewRegistry()
+
+	// Add go runtime metrics and process collectors.
+	registry.MustRegister(
+		collectors.NewGoCollector(),
+		collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
+		requestDurations,
+	)
+
+	go func() {
+		for {
+			// Record fictional latency.
+			now := time.Now()
+			requestDurations.(prometheus.ExemplarObserver).ObserveWithExemplar(
+				time.Since(now).Seconds(), prometheus.Labels{"dummyID": fmt.Sprint(rand.Intn(100000))},
+			)
+			time.Sleep(600 * time.Millisecond)
+		}
+	}()
+
+	// Expose /metrics HTTP endpoint using the created custom registry.
+	http.Handle(
+		"/metrics", promhttp.HandlerFor(
+			registry,
+			promhttp.HandlerOpts{
+				EnableOpenMetrics: true,
+			}),
+	)
+	// To test: curl -H 'Accept: application/openmetrics-text' localhost:8080/metrics
+	log.Fatalln(http.ListenAndServe(":8080", nil))
+}

examples/gocollector/main.go

@@ -0,0 +1,56 @@
+// Copyright 2022 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build go1.17
+// +build go1.17
+
+// A minimal example of how to include Prometheus instrumentation.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"regexp"
+
+	"git.internal/re/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus/collectors"
+	"git.internal/re/client_golang/prometheus/promhttp"
+)
+
+var addr = flag.String("listen-address", ":8080", "The address to listen on for HTTP requests.")
+
+func main() {
+	flag.Parse()
+
+	// Create a new registry.
+	reg := prometheus.NewRegistry()
+
+	// Add Go module build info.
+	reg.MustRegister(collectors.NewBuildInfoCollector())
+	reg.MustRegister(collectors.NewGoCollector(
+		collectors.WithGoCollectorRuntimeMetrics(collectors.GoRuntimeMetricsRule{Matcher: regexp.MustCompile("/.*")}),
+	))
+
+	// Expose the registered metrics via HTTP.
+	http.Handle("/metrics", promhttp.HandlerFor(
+		reg,
+		promhttp.HandlerOpts{
+			// Opt into OpenMetrics to support exemplars.
+			EnableOpenMetrics: true,
+		},
+	))
+	fmt.Println("Hello world from new Go Collector!")
+	log.Fatal(http.ListenAndServe(*addr, nil))
+}

examples/middleware/go.mod

@@ -0,0 +1,17 @@
+module github.com/jessicalins/instrumentation-practices-examples/middleware
+
+go 1.17
+
+require git.internal/re/client_golang v1.13.1
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.37.0 // indirect
+	github.com/prometheus/procfs v0.8.0 // indirect
+	golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
+)

examples/middleware/go.sum

@@ -0,0 +1,477 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
+cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
+cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
+cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
+cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
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examples/middleware/httpmiddleware/httpmiddleware.go

@@ -0,0 +1,103 @@
+// Copyright 2022 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package httpmiddleware is adapted from
+// https://github.com/bwplotka/correlator/tree/main/examples/observability/ping/pkg/httpinstrumentation
+package httpmiddleware
+
+import (
+	"net/http"
+
+	"git.internal/re/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus/promauto"
+	"git.internal/re/client_golang/prometheus/promhttp"
+)
+
+type Middleware interface {
+	// WrapHandler wraps the given HTTP handler for instrumentation.
+	WrapHandler(handlerName string, handler http.Handler) http.HandlerFunc
+}
+
+type middleware struct {
+	buckets  []float64
+	registry prometheus.Registerer
+}
+
+// WrapHandler wraps the given HTTP handler for instrumentation:
+// It registers four metric collectors (if not already done) and reports HTTP
+// metrics to the (newly or already) registered collectors.
+// Each has a constant label named "handler" with the provided handlerName as
+// value.
+func (m *middleware) WrapHandler(handlerName string, handler http.Handler) http.HandlerFunc {
+	reg := prometheus.WrapRegistererWith(prometheus.Labels{"handler": handlerName}, m.registry)
+
+	requestsTotal := promauto.With(reg).NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "http_requests_total",
+			Help: "Tracks the number of HTTP requests.",
+		}, []string{"method", "code"},
+	)
+	requestDuration := promauto.With(reg).NewHistogramVec(
+		prometheus.HistogramOpts{
+			Name:    "http_request_duration_seconds",
+			Help:    "Tracks the latencies for HTTP requests.",
+			Buckets: m.buckets,
+		},
+		[]string{"method", "code"},
+	)
+	requestSize := promauto.With(reg).NewSummaryVec(
+		prometheus.SummaryOpts{
+			Name: "http_request_size_bytes",
+			Help: "Tracks the size of HTTP requests.",
+		},
+		[]string{"method", "code"},
+	)
+	responseSize := promauto.With(reg).NewSummaryVec(
+		prometheus.SummaryOpts{
+			Name: "http_response_size_bytes",
+			Help: "Tracks the size of HTTP responses.",
+		},
+		[]string{"method", "code"},
+	)
+
+	// Wraps the provided http.Handler to observe the request result with the provided metrics.
+	base := promhttp.InstrumentHandlerCounter(
+		requestsTotal,
+		promhttp.InstrumentHandlerDuration(
+			requestDuration,
+			promhttp.InstrumentHandlerRequestSize(
+				requestSize,
+				promhttp.InstrumentHandlerResponseSize(
+					responseSize,
+					http.HandlerFunc(func(writer http.ResponseWriter, r *http.Request) {
+						handler.ServeHTTP(writer, r)
+					}),
+				),
+			),
+		),
+	)
+
+	return base.ServeHTTP
+}
+
+// New returns a Middleware interface.
+func New(registry prometheus.Registerer, buckets []float64) Middleware {
+	if buckets == nil {
+		buckets = prometheus.ExponentialBuckets(0.1, 1.5, 5)
+	}
+
+	return &middleware{
+		buckets:  buckets,
+		registry: registry,
+	}
+}

examples/middleware/main.go

@@ -0,0 +1,50 @@
+// Copyright 2022 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Simple example of auto-instrumentation by using an HTTP Middleware with relevant metrics.
+
+package main
+
+import (
+	"log"
+	"net/http"
+
+	"git.internal/re/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus/collectors"
+	"git.internal/re/client_golang/prometheus/promhttp"
+
+	"github.com/jessicalins/instrumentation-practices-examples/middleware/httpmiddleware"
+)
+
+func main() {
+	// Create non-global registry.
+	registry := prometheus.NewRegistry()
+
+	// Add go runtime metrics and process collectors.
+	registry.MustRegister(
+		collectors.NewGoCollector(),
+		collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
+	)
+
+	// Expose /metrics HTTP endpoint using the created custom registry.
+	http.Handle(
+		"/metrics",
+		httpmiddleware.New(
+			registry, nil).
+			WrapHandler("/metrics", promhttp.HandlerFor(
+				registry,
+				promhttp.HandlerOpts{}),
+			))
+
+	log.Fatalln(http.ListenAndServe(":8080", nil))
+}

examples/random/main.go

@@ -25,52 +25,71 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"git.internal/re/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus/collectors"
+	"git.internal/re/client_golang/prometheus/promhttp"
 )
 
-var (
-	addr              = flag.String("listen-address", ":8080", "The address to listen on for HTTP requests.")
-	uniformDomain     = flag.Float64("uniform.domain", 0.0002, "The domain for the uniform distribution.")
-	normDomain        = flag.Float64("normal.domain", 0.0002, "The domain for the normal distribution.")
-	normMean          = flag.Float64("normal.mean", 0.00001, "The mean for the normal distribution.")
-	oscillationPeriod = flag.Duration("oscillation-period", 10*time.Minute, "The duration of the rate oscillation period.")
-)
+type metrics struct {
+	rpcDurations          *prometheus.SummaryVec
+	rpcDurationsHistogram prometheus.Histogram
+}
 
-var (
-	// Create a summary to track fictional interservice RPC latencies for three
-	// distinct services with different latency distributions. These services are
-	// differentiated via a "service" label.
-	rpcDurations = prometheus.NewSummaryVec(
-		prometheus.SummaryOpts{
-			Name:       "rpc_durations_seconds",
-			Help:       "RPC latency distributions.",
-			Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
-		},
-		[]string{"service"},
-	)
-	// The same as above, but now as a histogram, and only for the normal
-	// distribution. The buckets are targeted to the parameters of the
-	// normal distribution, with 20 buckets centered on the mean, each
-	// half-sigma wide.
-	rpcDurationsHistogram = prometheus.NewHistogram(prometheus.HistogramOpts{
-		Name:    "rpc_durations_histogram_seconds",
-		Help:    "RPC latency distributions.",
-		Buckets: prometheus.LinearBuckets(*normMean-5**normDomain, .5**normDomain, 20),
-	})
-)
-
-func init() {
-	// Register the summary and the histogram with Prometheus's default registry.
-	prometheus.MustRegister(rpcDurations)
-	prometheus.MustRegister(rpcDurationsHistogram)
-	// Add Go module build info.
-	prometheus.MustRegister(prometheus.NewBuildInfoCollector())
+func NewMetrics(reg prometheus.Registerer, normMean, normDomain float64) *metrics {
+	m := &metrics{
+		// Create a summary to track fictional inter service RPC latencies for three
+		// distinct services with different latency distributions. These services are
+		// differentiated via a "service" label.
+		rpcDurations: prometheus.NewSummaryVec(
+			prometheus.SummaryOpts{
+				Name:       "rpc_durations_seconds",
+				Help:       "RPC latency distributions.",
+				Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
+			},
+			[]string{"service"},
+		),
+		// The same as above, but now as a histogram, and only for the
+		// normal distribution. The histogram features both conventional
+		// buckets as well as sparse buckets, the latter needed for the
+		// experimental native histograms (ingested by a Prometheus
+		// server v2.40 with the corresponding feature flag
+		// enabled). The conventional buckets are targeted to the
+		// parameters of the normal distribution, with 20 buckets
+		// centered on the mean, each half-sigma wide. The sparse
+		// buckets are always centered on zero, with a growth factor of
+		// one bucket to the next of (at most) 1.1. (The precise factor
+		// is 2^2^-3 = 1.0905077...)
+		rpcDurationsHistogram: prometheus.NewHistogram(prometheus.HistogramOpts{
+			Name:                        "rpc_durations_histogram_seconds",
+			Help:                        "RPC latency distributions.",
+			Buckets:                     prometheus.LinearBuckets(normMean-5*normDomain, .5*normDomain, 20),
+			NativeHistogramBucketFactor: 1.1,
+		}),
+	}
+	reg.MustRegister(m.rpcDurations)
+	reg.MustRegister(m.rpcDurationsHistogram)
+	return m
 }
 
 func main() {
+	var (
+		addr              = flag.String("listen-address", ":8080", "The address to listen on for HTTP requests.")
+		uniformDomain     = flag.Float64("uniform.domain", 0.0002, "The domain for the uniform distribution.")
+		normDomain        = flag.Float64("normal.domain", 0.0002, "The domain for the normal distribution.")
+		normMean          = flag.Float64("normal.mean", 0.00001, "The mean for the normal distribution.")
+		oscillationPeriod = flag.Duration("oscillation-period", 10*time.Minute, "The duration of the rate oscillation period.")
+	)
+
 	flag.Parse()
 
+	// Create a non-global registry.
+	reg := prometheus.NewRegistry()
+
+	// Create new metrics and register them using the custom registry.
+	m := NewMetrics(reg, *normMean, *normDomain)
+	// Add Go module build info.
+	reg.MustRegister(collectors.NewBuildInfoCollector())
+
 	start := time.Now()
 
 	oscillationFactor := func() float64 {
@@ -81,7 +100,7 @@ func main() {
 	go func() {
 		for {
 			v := rand.Float64() * *uniformDomain
-			rpcDurations.WithLabelValues("uniform").Observe(v)
+			m.rpcDurations.WithLabelValues("uniform").Observe(v)
 			time.Sleep(time.Duration(100*oscillationFactor()) * time.Millisecond)
 		}
 	}()
@@ -89,14 +108,14 @@ func main() {
 	go func() {
 		for {
 			v := (rand.NormFloat64() * *normDomain) + *normMean
-			rpcDurations.WithLabelValues("normal").Observe(v)
+			m.rpcDurations.WithLabelValues("normal").Observe(v)
 			// Demonstrate exemplar support with a dummy ID. This
 			// would be something like a trace ID in a real
 			// application.  Note the necessary type assertion. We
 			// already know that rpcDurationsHistogram implements
 			// the ExemplarObserver interface and thus don't need to
 			// check the outcome of the type assertion.
-			rpcDurationsHistogram.(prometheus.ExemplarObserver).ObserveWithExemplar(
+			m.rpcDurationsHistogram.(prometheus.ExemplarObserver).ObserveWithExemplar(
 				v, prometheus.Labels{"dummyID": fmt.Sprint(rand.Intn(100000))},
 			)
 			time.Sleep(time.Duration(75*oscillationFactor()) * time.Millisecond)
@@ -106,17 +125,19 @@ func main() {
 	go func() {
 		for {
 			v := rand.ExpFloat64() / 1e6
-			rpcDurations.WithLabelValues("exponential").Observe(v)
+			m.rpcDurations.WithLabelValues("exponential").Observe(v)
 			time.Sleep(time.Duration(50*oscillationFactor()) * time.Millisecond)
 		}
 	}()
 
 	// Expose the registered metrics via HTTP.
 	http.Handle("/metrics", promhttp.HandlerFor(
-		prometheus.DefaultGatherer,
+		reg,
 		promhttp.HandlerOpts{
 			// Opt into OpenMetrics to support exemplars.
 			EnableOpenMetrics: true,
+			// Pass custom registry
+			Registry: reg,
 		},
 	))
 	log.Fatal(http.ListenAndServe(*addr, nil))

examples/simple/main.go

@@ -19,13 +19,27 @@ import (
 	"log"
 	"net/http"
 
-	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"git.internal/re/client_golang/prometheus/collectors"
+
+	"git.internal/re/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus/promhttp"
 )
 
 var addr = flag.String("listen-address", ":8080", "The address to listen on for HTTP requests.")
 
 func main() {
 	flag.Parse()
-	http.Handle("/metrics", promhttp.Handler())
+
+	// Create non-global registry.
+	reg := prometheus.NewRegistry()
+
+	// Add go runtime metrics and process collectors.
+	reg.MustRegister(
+		collectors.NewGoCollector(),
+		collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
+	)
+
+	// Expose /metrics HTTP endpoint using the created custom registry.
+	http.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{Registry: reg}))
 	log.Fatal(http.ListenAndServe(*addr, nil))
 }

go.mod

@@ -1,16 +1,32 @@
-module github.com/prometheus/client_golang
+module git.internal/re/client_golang
+
+go 1.17
 
 require (
 	github.com/beorn7/perks v1.0.1
-	github.com/cespare/xxhash/v2 v2.1.1
-	github.com/golang/protobuf v1.4.3
-	github.com/json-iterator/go v1.1.11
-	github.com/prometheus/client_model v0.2.0
-	github.com/prometheus/common v0.26.0
-	github.com/prometheus/procfs v0.6.0
-	golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40
-	golang.org/x/text v0.3.2 // indirect
-	google.golang.org/protobuf v1.26.0-rc.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2
+	github.com/davecgh/go-spew v1.1.1
+	github.com/golang/protobuf v1.5.2
+	github.com/json-iterator/go v1.1.12
+	github.com/prometheus/client_model v0.3.0
+	github.com/prometheus/common v0.37.0
+	github.com/prometheus/procfs v0.8.0
+	golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a
+	google.golang.org/protobuf v1.28.1
 )
 
-go 1.13
+require (
+	github.com/jpillora/backoff v1.0.0 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f // indirect
+	github.com/prometheus/client_golang v1.12.1 // indirect
+	golang.org/x/net v0.0.0-20220225172249-27dd8689420f // indirect
+	golang.org/x/oauth2 v0.0.0-20220223155221-ee480838109b // indirect
+	golang.org/x/text v0.3.7 // indirect
+	google.golang.org/appengine v1.6.6 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)
+
+exclude git.internal/re/client_golang v1.12.1

go.sum

@@ -1,4 +1,38 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
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+cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
+cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
+cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
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+cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
+cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
@@ -8,45 +42,104 @@ github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
-github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
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+github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
+github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
+github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
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 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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@@ -61,8 +154,9 @@ github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJ
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@@ -74,19 +168,29 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
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@@ -96,57 +200,295 @@ github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXf
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+google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
+google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.28.0/go.mod h1:rpkK4SK4GF4Ach/+MFLZUBavHOvF2JJB5uozKKal+60=
+google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
+google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
+google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
 google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
+google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.26.0-rc.1 h1:7QnIQpGRHE5RnLKnESfDoxm2dTapTZua5a0kS0A+VXQ=
+google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
+google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
+google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=

prometheus/README.md

@@ -1 +1 @@
-See [![go-doc](https://godoc.org/github.com/prometheus/client_golang/prometheus?status.svg)](https://godoc.org/github.com/prometheus/client_golang/prometheus).
+See [![Go Reference](https://pkg.go.dev/badge/git.internal/re/client_golang/prometheus.svg)](https://pkg.go.dev/git.internal/re/client_golang/prometheus).

prometheus/build_info_collector.go

@@ -0,0 +1,38 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package prometheus
+
+import "runtime/debug"
+
+// NewBuildInfoCollector is the obsolete version of collectors.NewBuildInfoCollector.
+// See there for documentation.
+//
+// Deprecated: Use collectors.NewBuildInfoCollector instead.
+func NewBuildInfoCollector() Collector {
+	path, version, sum := "unknown", "unknown", "unknown"
+	if bi, ok := debug.ReadBuildInfo(); ok {
+		path = bi.Main.Path
+		version = bi.Main.Version
+		sum = bi.Main.Sum
+	}
+	c := &selfCollector{MustNewConstMetric(
+		NewDesc(
+			"go_build_info",
+			"Build information about the main Go module.",
+			nil, Labels{"path": path, "version": version, "checksum": sum},
+		),
+		GaugeValue, 1)}
+	c.init(c.self)
+	return c
+}

prometheus/collector.go

@@ -69,9 +69,9 @@ type Collector interface {
 // If a Collector collects the same metrics throughout its lifetime, its
 // Describe method can simply be implemented as:
 //
-//   func (c customCollector) Describe(ch chan<- *Desc) {
-//   	DescribeByCollect(c, ch)
-//   }
+//	func (c customCollector) Describe(ch chan<- *Desc) {
+//		DescribeByCollect(c, ch)
+//	}
 //
 // However, this will not work if the metrics collected change dynamically over
 // the lifetime of the Collector in a way that their combined set of descriptors
@@ -118,3 +118,11 @@ func (c *selfCollector) Describe(ch chan<- *Desc) {
 func (c *selfCollector) Collect(ch chan<- Metric) {
 	ch <- c.self
 }
+
+// collectorMetric is a metric that is also a collector.
+// Because of selfCollector, most (if not all) Metrics in
+// this package are also collectors.
+type collectorMetric interface {
+	Metric
+	Collector
+}

prometheus/collector_test.go

@@ -30,7 +30,6 @@ func (c collectorDescribedByCollect) Describe(ch chan<- *Desc) {
 }
 
 func TestDescribeByCollect(t *testing.T) {
-
 	goodCollector := collectorDescribedByCollect{
 		cnt: NewCounter(CounterOpts{Name: "c1", Help: "help c1"}),
 		gge: NewGauge(GaugeOpts{Name: "g1", Help: "help g1"}),

prometheus/collectors/collectors.go

@@ -14,3 +14,27 @@
 // Package collectors provides implementations of prometheus.Collector to
 // conveniently collect process and Go-related metrics.
 package collectors
+
+import "git.internal/re/client_golang/prometheus"
+
+// NewBuildInfoCollector returns a collector collecting a single metric
+// "go_build_info" with the constant value 1 and three labels "path", "version",
+// and "checksum". Their label values contain the main module path, version, and
+// checksum, respectively. The labels will only have meaningful values if the
+// binary is built with Go module support and from source code retrieved from
+// the source repository (rather than the local file system). This is usually
+// accomplished by building from outside of GOPATH, specifying the full address
+// of the main package, e.g. "GO111MODULE=on go run
+// git.internal/re/client_golang/examples/random". If built without Go
+// module support, all label values will be "unknown". If built with Go module
+// support but using the source code from the local file system, the "path" will
+// be set appropriately, but "checksum" will be empty and "version" will be
+// "(devel)".
+//
+// This collector uses only the build information for the main module. See
+// https://github.com/povilasv/prommod for an example of a collector for the
+// module dependencies.
+func NewBuildInfoCollector() prometheus.Collector {
+	//nolint:staticcheck // Ignore SA1019 until v2.
+	return prometheus.NewBuildInfoCollector()
+}

prometheus/collectors/dbstats_collector.go

@@ -16,7 +16,7 @@ package collectors
 import (
 	"database/sql"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
 )
 
 type dbStatsCollector struct {
@@ -101,7 +101,7 @@ func (c *dbStatsCollector) Describe(ch chan<- *prometheus.Desc) {
 	ch <- c.waitDuration
 	ch <- c.maxIdleClosed
 	ch <- c.maxLifetimeClosed
-	c.describeNewInGo115(ch)
+	ch <- c.maxIdleTimeClosed
 }
 
 // Collect implements Collector.
@@ -115,5 +115,5 @@ func (c *dbStatsCollector) Collect(ch chan<- prometheus.Metric) {
 	ch <- prometheus.MustNewConstMetric(c.waitDuration, prometheus.CounterValue, stats.WaitDuration.Seconds())
 	ch <- prometheus.MustNewConstMetric(c.maxIdleClosed, prometheus.CounterValue, float64(stats.MaxIdleClosed))
 	ch <- prometheus.MustNewConstMetric(c.maxLifetimeClosed, prometheus.CounterValue, float64(stats.MaxLifetimeClosed))
-	c.collectNewInGo115(ch, stats)
+	ch <- prometheus.MustNewConstMetric(c.maxIdleTimeClosed, prometheus.CounterValue, float64(stats.MaxIdleTimeClosed))
 }

prometheus/collectors/dbstats_collector_test.go

@@ -15,10 +15,9 @@ package collectors
 
 import (
 	"database/sql"
-	"runtime"
 	"testing"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
 )
 
 func TestDBStatsCollector(t *testing.T) {
@@ -50,9 +49,7 @@ func TestDBStatsCollector(t *testing.T) {
 		"go_sql_wait_duration_seconds_total",
 		"go_sql_max_idle_closed_total",
 		"go_sql_max_lifetime_closed_total",
-	}
-	if runtime.Version() >= "go1.15" {
-		names = append(names, "go_sql_max_idle_time_closed_total")
+		"go_sql_max_idle_time_closed_total",
 	}
 	type result struct {
 		found bool

prometheus/collectors/expvar_collector.go

@@ -13,7 +13,7 @@
 
 package collectors
 
-import "github.com/prometheus/client_golang/prometheus"
+import "git.internal/re/client_golang/prometheus"
 
 // NewExpvarCollector returns a newly allocated expvar Collector.
 //

prometheus/collectors/go_collector_go116.go

@@ -11,9 +11,12 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build !go1.17
+// +build !go1.17
+
 package collectors
 
-import "github.com/prometheus/client_golang/prometheus"
+import "git.internal/re/client_golang/prometheus"
 
 // NewGoCollector returns a collector that exports metrics about the current Go
 // process. This includes memory stats. To collect those, runtime.ReadMemStats
@@ -42,28 +45,5 @@ import "github.com/prometheus/client_golang/prometheus"
 // NOTE: The problem is solved in Go 1.15, see
 // https://github.com/golang/go/issues/19812 for the related Go issue.
 func NewGoCollector() prometheus.Collector {
-	//nolint:staticcheck // Ignore SA1019 until v2.
 	return prometheus.NewGoCollector()
 }
-
-// NewBuildInfoCollector returns a collector collecting a single metric
-// "go_build_info" with the constant value 1 and three labels "path", "version",
-// and "checksum". Their label values contain the main module path, version, and
-// checksum, respectively. The labels will only have meaningful values if the
-// binary is built with Go module support and from source code retrieved from
-// the source repository (rather than the local file system). This is usually
-// accomplished by building from outside of GOPATH, specifying the full address
-// of the main package, e.g. "GO111MODULE=on go run
-// github.com/prometheus/client_golang/examples/random". If built without Go
-// module support, all label values will be "unknown". If built with Go module
-// support but using the source code from the local file system, the "path" will
-// be set appropriately, but "checksum" will be empty and "version" will be
-// "(devel)".
-//
-// This collector uses only the build information for the main module. See
-// https://github.com/povilasv/prommod for an example of a collector for the
-// module dependencies.
-func NewBuildInfoCollector() prometheus.Collector {
-	//nolint:staticcheck // Ignore SA1019 until v2.
-	return prometheus.NewBuildInfoCollector()
-}

prometheus/collectors/go_collector_go117_test.go

@@ -0,0 +1,100 @@
+// Copyright 2022 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build go1.17 && !go1.19
+// +build go1.17,!go1.19
+
+package collectors
+
+func withAllMetrics() []string {
+	return withBaseMetrics([]string{
+		"go_gc_cycles_automatic_gc_cycles_total",
+		"go_gc_cycles_forced_gc_cycles_total",
+		"go_gc_cycles_total_gc_cycles_total",
+		"go_gc_heap_allocs_by_size_bytes",
+		"go_gc_heap_allocs_bytes_total",
+		"go_gc_heap_allocs_objects_total",
+		"go_gc_heap_frees_by_size_bytes",
+		"go_gc_heap_frees_bytes_total",
+		"go_gc_heap_frees_objects_total",
+		"go_gc_heap_goal_bytes",
+		"go_gc_heap_objects_objects",
+		"go_gc_heap_tiny_allocs_objects_total",
+		"go_gc_pauses_seconds",
+		"go_memory_classes_heap_free_bytes",
+		"go_memory_classes_heap_objects_bytes",
+		"go_memory_classes_heap_released_bytes",
+		"go_memory_classes_heap_stacks_bytes",
+		"go_memory_classes_heap_unused_bytes",
+		"go_memory_classes_metadata_mcache_free_bytes",
+		"go_memory_classes_metadata_mcache_inuse_bytes",
+		"go_memory_classes_metadata_mspan_free_bytes",
+		"go_memory_classes_metadata_mspan_inuse_bytes",
+		"go_memory_classes_metadata_other_bytes",
+		"go_memory_classes_os_stacks_bytes",
+		"go_memory_classes_other_bytes",
+		"go_memory_classes_profiling_buckets_bytes",
+		"go_memory_classes_total_bytes",
+		"go_sched_goroutines_goroutines",
+		"go_sched_latencies_seconds",
+	})
+}
+
+func withGCMetrics() []string {
+	return withBaseMetrics([]string{
+		"go_gc_cycles_automatic_gc_cycles_total",
+		"go_gc_cycles_forced_gc_cycles_total",
+		"go_gc_cycles_total_gc_cycles_total",
+		"go_gc_heap_allocs_by_size_bytes",
+		"go_gc_heap_allocs_bytes_total",
+		"go_gc_heap_allocs_objects_total",
+		"go_gc_heap_frees_by_size_bytes",
+		"go_gc_heap_frees_bytes_total",
+		"go_gc_heap_frees_objects_total",
+		"go_gc_heap_goal_bytes",
+		"go_gc_heap_objects_objects",
+		"go_gc_heap_tiny_allocs_objects_total",
+		"go_gc_pauses_seconds",
+	})
+}
+
+func withMemoryMetrics() []string {
+	return withBaseMetrics([]string{
+		"go_memory_classes_heap_free_bytes",
+		"go_memory_classes_heap_objects_bytes",
+		"go_memory_classes_heap_released_bytes",
+		"go_memory_classes_heap_stacks_bytes",
+		"go_memory_classes_heap_unused_bytes",
+		"go_memory_classes_metadata_mcache_free_bytes",
+		"go_memory_classes_metadata_mcache_inuse_bytes",
+		"go_memory_classes_metadata_mspan_free_bytes",
+		"go_memory_classes_metadata_mspan_inuse_bytes",
+		"go_memory_classes_metadata_other_bytes",
+		"go_memory_classes_os_stacks_bytes",
+		"go_memory_classes_other_bytes",
+		"go_memory_classes_profiling_buckets_bytes",
+		"go_memory_classes_total_bytes",
+	})
+}
+
+func withSchedulerMetrics() []string {
+	return []string{
+		"go_gc_duration_seconds",
+		"go_goroutines",
+		"go_info",
+		"go_memstats_last_gc_time_seconds",
+		"go_sched_goroutines_goroutines",
+		"go_sched_latencies_seconds",
+		"go_threads",
+	}
+}

prometheus/collectors/go_collector_go119_test.go

@@ -0,0 +1,107 @@
+// Copyright 2022 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build go1.19 && !go1.20
+// +build go1.19,!go1.20
+
+package collectors
+
+func withAllMetrics() []string {
+	return withBaseMetrics([]string{
+		"go_cgo_go_to_c_calls_calls_total",
+		"go_gc_cycles_automatic_gc_cycles_total",
+		"go_gc_cycles_forced_gc_cycles_total",
+		"go_gc_cycles_total_gc_cycles_total",
+		"go_gc_heap_allocs_by_size_bytes",
+		"go_gc_heap_allocs_bytes_total",
+		"go_gc_heap_allocs_objects_total",
+		"go_gc_heap_frees_by_size_bytes",
+		"go_gc_heap_frees_bytes_total",
+		"go_gc_heap_frees_objects_total",
+		"go_gc_heap_goal_bytes",
+		"go_gc_heap_objects_objects",
+		"go_gc_heap_tiny_allocs_objects_total",
+		"go_gc_limiter_last_enabled_gc_cycle",
+		"go_gc_pauses_seconds",
+		"go_gc_stack_starting_size_bytes",
+		"go_memory_classes_heap_free_bytes",
+		"go_memory_classes_heap_objects_bytes",
+		"go_memory_classes_heap_released_bytes",
+		"go_memory_classes_heap_stacks_bytes",
+		"go_memory_classes_heap_unused_bytes",
+		"go_memory_classes_metadata_mcache_free_bytes",
+		"go_memory_classes_metadata_mcache_inuse_bytes",
+		"go_memory_classes_metadata_mspan_free_bytes",
+		"go_memory_classes_metadata_mspan_inuse_bytes",
+		"go_memory_classes_metadata_other_bytes",
+		"go_memory_classes_os_stacks_bytes",
+		"go_memory_classes_other_bytes",
+		"go_memory_classes_profiling_buckets_bytes",
+		"go_memory_classes_total_bytes",
+		"go_sched_gomaxprocs_threads",
+		"go_sched_goroutines_goroutines",
+		"go_sched_latencies_seconds",
+	})
+}
+
+func withGCMetrics() []string {
+	return withBaseMetrics([]string{
+		"go_gc_cycles_automatic_gc_cycles_total",
+		"go_gc_cycles_forced_gc_cycles_total",
+		"go_gc_cycles_total_gc_cycles_total",
+		"go_gc_heap_allocs_by_size_bytes",
+		"go_gc_heap_allocs_bytes_total",
+		"go_gc_heap_allocs_objects_total",
+		"go_gc_heap_frees_by_size_bytes",
+		"go_gc_heap_frees_bytes_total",
+		"go_gc_heap_frees_objects_total",
+		"go_gc_heap_goal_bytes",
+		"go_gc_heap_objects_objects",
+		"go_gc_heap_tiny_allocs_objects_total",
+		"go_gc_limiter_last_enabled_gc_cycle",
+		"go_gc_pauses_seconds",
+		"go_gc_stack_starting_size_bytes",
+	})
+}
+
+func withMemoryMetrics() []string {
+	return withBaseMetrics([]string{
+		"go_memory_classes_heap_free_bytes",
+		"go_memory_classes_heap_objects_bytes",
+		"go_memory_classes_heap_released_bytes",
+		"go_memory_classes_heap_stacks_bytes",
+		"go_memory_classes_heap_unused_bytes",
+		"go_memory_classes_metadata_mcache_free_bytes",
+		"go_memory_classes_metadata_mcache_inuse_bytes",
+		"go_memory_classes_metadata_mspan_free_bytes",
+		"go_memory_classes_metadata_mspan_inuse_bytes",
+		"go_memory_classes_metadata_other_bytes",
+		"go_memory_classes_os_stacks_bytes",
+		"go_memory_classes_other_bytes",
+		"go_memory_classes_profiling_buckets_bytes",
+		"go_memory_classes_total_bytes",
+	})
+}
+
+func withSchedulerMetrics() []string {
+	return []string{
+		"go_gc_duration_seconds",
+		"go_goroutines",
+		"go_info",
+		"go_memstats_last_gc_time_seconds",
+		"go_sched_gomaxprocs_threads",
+		"go_sched_goroutines_goroutines",
+		"go_sched_latencies_seconds",
+		"go_threads",
+	}
+}

prometheus/collectors/go_collector_latest.go

@@ -0,0 +1,160 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build go1.17
+// +build go1.17
+
+package collectors
+
+import (
+	"regexp"
+
+	"git.internal/re/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus/internal"
+)
+
+var (
+	// MetricsAll allows all the metrics to be collected from Go runtime.
+	MetricsAll = GoRuntimeMetricsRule{regexp.MustCompile("/.*")}
+	// MetricsGC allows only GC metrics to be collected from Go runtime.
+	// e.g. go_gc_cycles_automatic_gc_cycles_total
+	MetricsGC = GoRuntimeMetricsRule{regexp.MustCompile(`^/gc/.*`)}
+	// MetricsMemory allows only memory metrics to be collected from Go runtime.
+	// e.g. go_memory_classes_heap_free_bytes
+	MetricsMemory = GoRuntimeMetricsRule{regexp.MustCompile(`^/memory/.*`)}
+	// MetricsScheduler allows only scheduler metrics to be collected from Go runtime.
+	// e.g. go_sched_goroutines_goroutines
+	MetricsScheduler = GoRuntimeMetricsRule{regexp.MustCompile(`^/sched/.*`)}
+)
+
+// WithGoCollectorMemStatsMetricsDisabled disables metrics that is gathered in runtime.MemStats structure such as:
+//
+// go_memstats_alloc_bytes
+// go_memstats_alloc_bytes_total
+// go_memstats_sys_bytes
+// go_memstats_lookups_total
+// go_memstats_mallocs_total
+// go_memstats_frees_total
+// go_memstats_heap_alloc_bytes
+// go_memstats_heap_sys_bytes
+// go_memstats_heap_idle_bytes
+// go_memstats_heap_inuse_bytes
+// go_memstats_heap_released_bytes
+// go_memstats_heap_objects
+// go_memstats_stack_inuse_bytes
+// go_memstats_stack_sys_bytes
+// go_memstats_mspan_inuse_bytes
+// go_memstats_mspan_sys_bytes
+// go_memstats_mcache_inuse_bytes
+// go_memstats_mcache_sys_bytes
+// go_memstats_buck_hash_sys_bytes
+// go_memstats_gc_sys_bytes
+// go_memstats_other_sys_bytes
+// go_memstats_next_gc_bytes
+//
+// so the metrics known from pre client_golang v1.12.0,
+//
+// NOTE(bwplotka): The above represents runtime.MemStats statistics, but they are
+// actually implemented using new runtime/metrics package. (except skipped go_memstats_gc_cpu_fraction
+// -- see  https://git.internal/re/client_golang/issues/842#issuecomment-861812034 for explanation).
+//
+// Some users might want to disable this on collector level (although you can use scrape relabelling on Prometheus),
+// because similar metrics can be now obtained using WithGoCollectorRuntimeMetrics. Note that the semantics of new
+// metrics might be different, plus the names can be change over time with different Go version.
+//
+// NOTE(bwplotka): Changing metric names can be tedious at times as the alerts, recording rules and dashboards have to be adjusted.
+// The old metrics are also very useful, with many guides and books written about how to interpret them.
+//
+// As a result our recommendation would be to stick with MemStats like metrics and enable other runtime/metrics if you are interested
+// in advanced insights Go provides. See ExampleGoCollector_WithAdvancedGoMetrics.
+func WithGoCollectorMemStatsMetricsDisabled() func(options *internal.GoCollectorOptions) {
+	return func(o *internal.GoCollectorOptions) {
+		o.DisableMemStatsLikeMetrics = true
+	}
+}
+
+// GoRuntimeMetricsRule allow enabling and configuring particular group of runtime/metrics.
+// TODO(bwplotka): Consider adding ability to adjust buckets.
+type GoRuntimeMetricsRule struct {
+	// Matcher represents RE2 expression will match the runtime/metrics from https://golang.bg/src/runtime/metrics/description.go
+	// Use `regexp.MustCompile` or `regexp.Compile` to create this field.
+	Matcher *regexp.Regexp
+}
+
+// WithGoCollectorRuntimeMetrics allows enabling and configuring particular group of runtime/metrics.
+// See the list of metrics https://golang.bg/src/runtime/metrics/description.go (pick the Go version you use there!).
+// You can use this option in repeated manner, which will add new rules. The order of rules is important, the last rule
+// that matches particular metrics is applied.
+func WithGoCollectorRuntimeMetrics(rules ...GoRuntimeMetricsRule) func(options *internal.GoCollectorOptions) {
+	rs := make([]internal.GoCollectorRule, len(rules))
+	for i, r := range rules {
+		rs[i] = internal.GoCollectorRule{
+			Matcher: r.Matcher,
+		}
+	}
+
+	return func(o *internal.GoCollectorOptions) {
+		o.RuntimeMetricRules = append(o.RuntimeMetricRules, rs...)
+	}
+}
+
+// WithoutGoCollectorRuntimeMetrics allows disabling group of runtime/metrics that you might have added in WithGoCollectorRuntimeMetrics.
+// It behaves similarly to WithGoCollectorRuntimeMetrics just with deny-list semantics.
+func WithoutGoCollectorRuntimeMetrics(matchers ...*regexp.Regexp) func(options *internal.GoCollectorOptions) {
+	rs := make([]internal.GoCollectorRule, len(matchers))
+	for i, m := range matchers {
+		rs[i] = internal.GoCollectorRule{
+			Matcher: m,
+			Deny:    true,
+		}
+	}
+
+	return func(o *internal.GoCollectorOptions) {
+		o.RuntimeMetricRules = append(o.RuntimeMetricRules, rs...)
+	}
+}
+
+// GoCollectionOption represents Go collection option flag.
+// Deprecated.
+type GoCollectionOption uint32
+
+const (
+	// GoRuntimeMemStatsCollection represents the metrics represented by runtime.MemStats structure.
+	// Deprecated. Use WithGoCollectorMemStatsMetricsDisabled() function to disable those metrics in the collector.
+	GoRuntimeMemStatsCollection GoCollectionOption = 1 << iota
+	// GoRuntimeMetricsCollection is the new set of metrics represented by runtime/metrics package.
+	// Deprecated. Use WithGoCollectorRuntimeMetrics(GoRuntimeMetricsRule{Matcher: regexp.MustCompile("/.*")})
+	// function to enable those metrics in the collector.
+	GoRuntimeMetricsCollection
+)
+
+// WithGoCollections allows enabling different collections for Go collector on top of base metrics.
+// Deprecated. Use WithGoCollectorRuntimeMetrics() and WithGoCollectorMemStatsMetricsDisabled() instead to control metrics.
+func WithGoCollections(flags GoCollectionOption) func(options *internal.GoCollectorOptions) {
+	return func(options *internal.GoCollectorOptions) {
+		if flags&GoRuntimeMemStatsCollection == 0 {
+			WithGoCollectorMemStatsMetricsDisabled()(options)
+		}
+
+		if flags&GoRuntimeMetricsCollection != 0 {
+			WithGoCollectorRuntimeMetrics(GoRuntimeMetricsRule{Matcher: regexp.MustCompile("/.*")})(options)
+		}
+	}
+}
+
+// NewGoCollector returns a collector that exports metrics about the current Go
+// process using debug.GCStats (base metrics) and runtime/metrics (both in MemStats style and new ones).
+func NewGoCollector(opts ...func(o *internal.GoCollectorOptions)) prometheus.Collector {
+	//nolint:staticcheck // Ignore SA1019 until v2.
+	return prometheus.NewGoCollector(opts...)
+}

prometheus/collectors/go_collector_latest_test.go

@@ -0,0 +1,233 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build go1.17
+// +build go1.17
+
+package collectors
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+	"reflect"
+	"regexp"
+	"sort"
+	"testing"
+
+	"git.internal/re/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus/promhttp"
+)
+
+var baseMetrics = []string{
+	"go_gc_duration_seconds",
+	"go_goroutines",
+	"go_info",
+	"go_memstats_last_gc_time_seconds",
+	"go_threads",
+}
+
+func TestGoCollectorMarshalling(t *testing.T) {
+	reg := prometheus.NewRegistry()
+	reg.MustRegister(NewGoCollector(
+		WithGoCollectorRuntimeMetrics(GoRuntimeMetricsRule{
+			Matcher: regexp.MustCompile("/.*"),
+		}),
+	))
+	result, err := reg.Gather()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := json.Marshal(result); err != nil {
+		t.Errorf("json marshalling shoud not fail, %v", err)
+	}
+}
+
+func TestWithGoCollectorMemStatsMetricsDisabled(t *testing.T) {
+	reg := prometheus.NewRegistry()
+	reg.MustRegister(NewGoCollector(
+		WithGoCollectorMemStatsMetricsDisabled(),
+	))
+	result, err := reg.Gather()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	got := []string{}
+	for _, r := range result {
+		got = append(got, r.GetName())
+	}
+
+	if !reflect.DeepEqual(got, baseMetrics) {
+		t.Errorf("got %v, want %v", got, baseMetrics)
+	}
+}
+
+func TestGoCollectorAllowList(t *testing.T) {
+	for _, test := range []struct {
+		name     string
+		rules    []GoRuntimeMetricsRule
+		expected []string
+	}{
+		{
+			name:     "Without any rules",
+			rules:    nil,
+			expected: baseMetrics,
+		},
+		{
+			name:     "allow all",
+			rules:    []GoRuntimeMetricsRule{MetricsAll},
+			expected: withAllMetrics(),
+		},
+		{
+			name:     "allow GC",
+			rules:    []GoRuntimeMetricsRule{MetricsGC},
+			expected: withGCMetrics(),
+		},
+		{
+			name:     "allow Memory",
+			rules:    []GoRuntimeMetricsRule{MetricsMemory},
+			expected: withMemoryMetrics(),
+		},
+		{
+			name:     "allow Scheduler",
+			rules:    []GoRuntimeMetricsRule{MetricsScheduler},
+			expected: withSchedulerMetrics(),
+		},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			reg := prometheus.NewRegistry()
+			reg.MustRegister(NewGoCollector(
+				WithGoCollectorMemStatsMetricsDisabled(),
+				WithGoCollectorRuntimeMetrics(test.rules...),
+			))
+			result, err := reg.Gather()
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			got := []string{}
+			for _, r := range result {
+				got = append(got, r.GetName())
+			}
+
+			if !reflect.DeepEqual(got, test.expected) {
+				t.Errorf("got %v, want %v", got, test.expected)
+			}
+		})
+	}
+}
+
+func withBaseMetrics(metricNames []string) []string {
+	metricNames = append(metricNames, baseMetrics...)
+	sort.Strings(metricNames)
+	return metricNames
+}
+
+func TestGoCollectorDenyList(t *testing.T) {
+	for _, test := range []struct {
+		name     string
+		matchers []*regexp.Regexp
+		expected []string
+	}{
+		{
+			name:     "Without any matchers",
+			matchers: nil,
+			expected: baseMetrics,
+		},
+		{
+			name:     "deny all",
+			matchers: []*regexp.Regexp{regexp.MustCompile("/.*")},
+			expected: baseMetrics,
+		},
+		{
+			name: "deny gc and scheduler latency",
+			matchers: []*regexp.Regexp{
+				regexp.MustCompile("^/gc/.*"),
+				regexp.MustCompile("^/sched/latencies:.*"),
+			},
+			expected: baseMetrics,
+		},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			reg := prometheus.NewRegistry()
+			reg.MustRegister(NewGoCollector(
+				WithGoCollectorMemStatsMetricsDisabled(),
+				WithoutGoCollectorRuntimeMetrics(test.matchers...),
+			))
+			result, err := reg.Gather()
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			got := []string{}
+			for _, r := range result {
+				got = append(got, r.GetName())
+			}
+
+			if !reflect.DeepEqual(got, test.expected) {
+				t.Errorf("got %v, want %v", got, test.expected)
+			}
+		})
+	}
+}
+
+func ExampleGoCollector() {
+	reg := prometheus.NewRegistry()
+
+	// Register the GoCollector with the default options. Only the base metrics will be enabled.
+	reg.MustRegister(NewGoCollector())
+
+	http.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{}))
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}
+
+func ExampleGoCollector_WithAdvancedGoMetrics() {
+	reg := prometheus.NewRegistry()
+
+	// Enable Go metrics with pre-defined rules. Or your custom rules.
+	reg.MustRegister(
+		NewGoCollector(
+			WithGoCollectorMemStatsMetricsDisabled(),
+			WithGoCollectorRuntimeMetrics(
+				MetricsScheduler,
+				MetricsMemory,
+				GoRuntimeMetricsRule{
+					Matcher: regexp.MustCompile("^/mycustomrule.*"),
+				},
+			),
+			WithoutGoCollectorRuntimeMetrics(regexp.MustCompile("^/gc/.*")),
+		))
+
+	http.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{}))
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}
+
+func ExampleGoCollector_DefaultRegister() {
+	// Unregister the default GoCollector.
+	prometheus.Unregister(NewGoCollector())
+
+	// Register the default GoCollector with a custom config.
+	prometheus.MustRegister(NewGoCollector(WithGoCollectorRuntimeMetrics(
+		MetricsScheduler,
+		MetricsGC,
+		GoRuntimeMetricsRule{
+			Matcher: regexp.MustCompile("^/mycustomrule.*"),
+		},
+	),
+	))
+
+	http.Handle("/metrics", promhttp.Handler())
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}

prometheus/collectors/process_collector.go

@@ -13,7 +13,7 @@
 
 package collectors
 
-import "github.com/prometheus/client_golang/prometheus"
+import "git.internal/re/client_golang/prometheus"
 
 // ProcessCollectorOpts defines the behavior of a process metrics collector
 // created with NewProcessCollector.

prometheus/counter.go

@@ -51,7 +51,7 @@ type Counter interface {
 // will lead to a valid (label-less) exemplar. But if Labels is nil, the current
 // exemplar is left in place. AddWithExemplar panics if the value is < 0, if any
 // of the provided labels are invalid, or if the provided labels contain more
-// than 64 runes in total.
+// than 128 runes in total.
 type ExemplarAdder interface {
 	AddWithExemplar(value float64, exemplar Labels)
 }
@@ -133,15 +133,20 @@ func (c *counter) Inc() {
 	atomic.AddUint64(&c.valInt, 1)
 }
 
-func (c *counter) Write(out *dto.Metric) error {
+func (c *counter) get() float64 {
 	fval := math.Float64frombits(atomic.LoadUint64(&c.valBits))
 	ival := atomic.LoadUint64(&c.valInt)
-	val := fval + float64(ival)
+	return fval + float64(ival)
+}
 
+func (c *counter) Write(out *dto.Metric) error {
+	// Read the Exemplar first and the value second. This is to avoid a race condition
+	// where users see an exemplar for a not-yet-existing observation.
 	var exemplar *dto.Exemplar
 	if e := c.exemplar.Load(); e != nil {
 		exemplar = e.(*dto.Exemplar)
 	}
+	val := c.get()
 
 	return populateMetric(CounterValue, val, c.labelPairs, exemplar, out)
 }
@@ -241,7 +246,8 @@ func (v *CounterVec) GetMetricWith(labels Labels) (Counter, error) {
 // WithLabelValues works as GetMetricWithLabelValues, but panics where
 // GetMetricWithLabelValues would have returned an error. Not returning an
 // error allows shortcuts like
-//     myVec.WithLabelValues("404", "GET").Add(42)
+//
+//	myVec.WithLabelValues("404", "GET").Add(42)
 func (v *CounterVec) WithLabelValues(lvs ...string) Counter {
 	c, err := v.GetMetricWithLabelValues(lvs...)
 	if err != nil {
@@ -252,7 +258,8 @@ func (v *CounterVec) WithLabelValues(lvs ...string) Counter {
 
 // With works as GetMetricWith, but panics where GetMetricWithLabels would have
 // returned an error. Not returning an error allows shortcuts like
-//     myVec.With(prometheus.Labels{"code": "404", "method": "GET"}).Add(42)
+//
+//	myVec.With(prometheus.Labels{"code": "404", "method": "GET"}).Add(42)
 func (v *CounterVec) With(labels Labels) Counter {
 	c, err := v.GetMetricWith(labels)
 	if err != nil {

prometheus/counter_test.go

@@ -16,12 +16,13 @@ package prometheus
 import (
 	"fmt"
 	"math"
+	"strings"
 	"testing"
 	"time"
 
 	//nolint:staticcheck // Ignore SA1019. Need to keep deprecated package for compatibility.
 	"github.com/golang/protobuf/proto"
-	"github.com/golang/protobuf/ptypes"
+	"google.golang.org/protobuf/types/known/timestamppb"
 
 	dto "github.com/prometheus/client_model/go"
 )
@@ -225,13 +226,13 @@ func TestCounterExemplar(t *testing.T) {
 	}).(*counter)
 	counter.now = func() time.Time { return now }
 
-	ts, err := ptypes.TimestampProto(now)
-	if err != nil {
+	ts := timestamppb.New(now)
+	if err := ts.CheckValid(); err != nil {
 		t.Fatal(err)
 	}
 	expectedExemplar := &dto.Exemplar{
 		Label: []*dto.LabelPair{
-			&dto.LabelPair{Name: proto.String("foo"), Value: proto.String("bar")},
+			{Name: proto.String("foo"), Value: proto.String("bar")},
 		},
 		Value:     proto.Float64(42),
 		Timestamp: ts,
@@ -262,10 +263,11 @@ func TestCounterExemplar(t *testing.T) {
 				err = e.(error)
 			}
 		}()
-		// Should panic because of 65 runes.
+		// Should panic because of 129 runes.
 		counter.AddWithExemplar(42, Labels{
 			"abcdefghijklmnopqrstuvwxyz": "26+16 characters",
 			"x1234567":                   "8+15 characters",
+			"z":                          strings.Repeat("x", 63),
 		})
 		return nil
 	}

prometheus/desc.go

@@ -20,6 +20,9 @@ import (
 	"strings"
 
 	"github.com/cespare/xxhash/v2"
+
+	"git.internal/re/client_golang/prometheus/internal"
+
 	//nolint:staticcheck // Ignore SA1019. Need to keep deprecated package for compatibility.
 	"github.com/golang/protobuf/proto"
 	"github.com/prometheus/common/model"
@@ -154,7 +157,7 @@ func NewDesc(fqName, help string, variableLabels []string, constLabels Labels) *
 			Value: proto.String(v),
 		})
 	}
-	sort.Sort(labelPairSorter(d.constLabelPairs))
+	sort.Sort(internal.LabelPairSorter(d.constLabelPairs))
 	return d
 }
 

prometheus/doc.go

@@ -21,55 +21,66 @@
 // All exported functions and methods are safe to be used concurrently unless
 // specified otherwise.
 //
-// A Basic Example
+// # A Basic Example
 //
 // As a starting point, a very basic usage example:
 //
-//    package main
+//	package main
 //
-//    import (
-//    	"log"
-//    	"net/http"
+//	import (
+//		"log"
+//		"net/http"
 //
-//    	"github.com/prometheus/client_golang/prometheus"
-//    	"github.com/prometheus/client_golang/prometheus/promhttp"
-//    )
+//		"git.internal/re/client_golang/prometheus"
+//		"git.internal/re/client_golang/prometheus/promhttp"
+//	)
 //
-//    var (
-//    	cpuTemp = prometheus.NewGauge(prometheus.GaugeOpts{
-//    		Name: "cpu_temperature_celsius",
-//    		Help: "Current temperature of the CPU.",
-//    	})
-//    	hdFailures = prometheus.NewCounterVec(
-//    		prometheus.CounterOpts{
-//    			Name: "hd_errors_total",
-//    			Help: "Number of hard-disk errors.",
-//    		},
-//    		[]string{"device"},
-//    	)
-//    )
+//	type metrics struct {
+//		cpuTemp  prometheus.Gauge
+//	  hdFailures *prometheus.CounterVec
+//	}
 //
-//    func init() {
-//    	// Metrics have to be registered to be exposed:
-//    	prometheus.MustRegister(cpuTemp)
-//    	prometheus.MustRegister(hdFailures)
-//    }
+//	func NewMetrics(reg prometheus.Registerer) *metrics {
+//	  m := &metrics{
+//	    cpuTemp: prometheus.NewGauge(prometheus.GaugeOpts{
+//	      Name: "cpu_temperature_celsius",
+//	      Help: "Current temperature of the CPU.",
+//	    }),
+//	    hdFailures: prometheus.NewCounterVec(
+//	      prometheus.CounterOpts{
+//	        Name: "hd_errors_total",
+//	        Help: "Number of hard-disk errors.",
+//	      },
+//	      []string{"device"},
+//	    ),
+//	  }
+//	  reg.MustRegister(m.cpuTemp)
+//	  reg.MustRegister(m.hdFailures)
+//	  return m
+//	}
 //
-//    func main() {
-//    	cpuTemp.Set(65.3)
-//    	hdFailures.With(prometheus.Labels{"device":"/dev/sda"}).Inc()
+//	func main() {
+//	  // Create a non-global registry.
+//	  reg := prometheus.NewRegistry()
 //
-//    	// The Handler function provides a default handler to expose metrics
-//    	// via an HTTP server. "/metrics" is the usual endpoint for that.
-//    	http.Handle("/metrics", promhttp.Handler())
-//    	log.Fatal(http.ListenAndServe(":8080", nil))
-//    }
+//	  // Create new metrics and register them using the custom registry.
+//	  m := NewMetrics(reg)
+//	  // Set values for the new created metrics.
+//		m.cpuTemp.Set(65.3)
+//		m.hdFailures.With(prometheus.Labels{"device":"/dev/sda"}).Inc()
 //
+//		// Expose metrics and custom registry via an HTTP server
+//		// using the HandleFor function. "/metrics" is the usual endpoint for that.
+//		http.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{Registry: reg}))
+//		log.Fatal(http.ListenAndServe(":8080", nil))
+//	}
 //
 // This is a complete program that exports two metrics, a Gauge and a Counter,
 // the latter with a label attached to turn it into a (one-dimensional) vector.
+// It register the metrics using a custom registry and exposes them via an HTTP server
+// on the /metrics endpoint.
 //
-// Metrics
+// # Metrics
 //
 // The number of exported identifiers in this package might appear a bit
 // overwhelming. However, in addition to the basic plumbing shown in the example
@@ -100,7 +111,7 @@
 // To create instances of Metrics and their vector versions, you need a suitable
 // …Opts struct, i.e. GaugeOpts, CounterOpts, SummaryOpts, or HistogramOpts.
 //
-// Custom Collectors and constant Metrics
+// # Custom Collectors and constant Metrics
 //
 // While you could create your own implementations of Metric, most likely you
 // will only ever implement the Collector interface on your own. At a first
@@ -141,7 +152,7 @@
 // a metric, GaugeFunc, CounterFunc, or UntypedFunc might be interesting
 // shortcuts.
 //
-// Advanced Uses of the Registry
+// # Advanced Uses of the Registry
 //
 // While MustRegister is the by far most common way of registering a Collector,
 // sometimes you might want to handle the errors the registration might cause.
@@ -176,23 +187,23 @@
 // NewProcessCollector). With a custom registry, you are in control and decide
 // yourself about the Collectors to register.
 //
-// HTTP Exposition
+// # HTTP Exposition
 //
 // The Registry implements the Gatherer interface. The caller of the Gather
 // method can then expose the gathered metrics in some way. Usually, the metrics
 // are served via HTTP on the /metrics endpoint. That's happening in the example
 // above. The tools to expose metrics via HTTP are in the promhttp sub-package.
 //
-// Pushing to the Pushgateway
+// # Pushing to the Pushgateway
 //
 // Function for pushing to the Pushgateway can be found in the push sub-package.
 //
-// Graphite Bridge
+// # Graphite Bridge
 //
 // Functions and examples to push metrics from a Gatherer to Graphite can be
 // found in the graphite sub-package.
 //
-// Other Means of Exposition
+// # Other Means of Exposition
 //
 // More ways of exposing metrics can easily be added by following the approaches
 // of the existing implementations.

prometheus/example_clustermanager_test.go

@@ -17,8 +17,8 @@ import (
 	"log"
 	"net/http"
 
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"git.internal/re/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus/promhttp"
 )
 
 // ClusterManager is an example for a system that might have been built without

prometheus/example_metricvec_test.go

@@ -21,7 +21,7 @@ import (
 
 	dto "github.com/prometheus/client_model/go"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
 )
 
 // Info implements an info pseudo-metric, which is modeled as a Gauge that
@@ -108,7 +108,6 @@ func (v *InfoVec) MustCurryWith(labels prometheus.Labels) *InfoVec {
 }
 
 func ExampleMetricVec() {
-
 	infoVec := NewInfoVec(
 		"library_version_info",
 		"Versions of the libraries used in this binary.",

prometheus/example_timer_complex_test.go

@@ -16,30 +16,28 @@ package prometheus_test
 import (
 	"net/http"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
 )
 
-var (
-	// apiRequestDuration tracks the duration separate for each HTTP status
-	// class (1xx, 2xx, ...). This creates a fair amount of time series on
-	// the Prometheus server. Usually, you would track the duration of
-	// serving HTTP request without partitioning by outcome. Do something
-	// like this only if needed. Also note how only status classes are
-	// tracked, not every single status code. The latter would create an
-	// even larger amount of time series. Request counters partitioned by
-	// status code are usually OK as each counter only creates one time
-	// series. Histograms are way more expensive, so partition with care and
-	// only where you really need separate latency tracking. Partitioning by
-	// status class is only an example. In concrete cases, other partitions
-	// might make more sense.
-	apiRequestDuration = prometheus.NewHistogramVec(
-		prometheus.HistogramOpts{
-			Name:    "api_request_duration_seconds",
-			Help:    "Histogram for the request duration of the public API, partitioned by status class.",
-			Buckets: prometheus.ExponentialBuckets(0.1, 1.5, 5),
-		},
-		[]string{"status_class"},
-	)
+// apiRequestDuration tracks the duration separate for each HTTP status
+// class (1xx, 2xx, ...). This creates a fair amount of time series on
+// the Prometheus server. Usually, you would track the duration of
+// serving HTTP request without partitioning by outcome. Do something
+// like this only if needed. Also note how only status classes are
+// tracked, not every single status code. The latter would create an
+// even larger amount of time series. Request counters partitioned by
+// status code are usually OK as each counter only creates one time
+// series. Histograms are way more expensive, so partition with care and
+// only where you really need separate latency tracking. Partitioning by
+// status class is only an example. In concrete cases, other partitions
+// might make more sense.
+var apiRequestDuration = prometheus.NewHistogramVec(
+	prometheus.HistogramOpts{
+		Name:    "api_request_duration_seconds",
+		Help:    "Histogram for the request duration of the public API, partitioned by status class.",
+		Buckets: prometheus.ExponentialBuckets(0.1, 1.5, 5),
+	},
+	[]string{"status_class"},
 )
 
 func handler(w http.ResponseWriter, r *http.Request) {

prometheus/example_timer_gauge_test.go

@@ -16,20 +16,18 @@ package prometheus_test
 import (
 	"os"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
 )
 
-var (
-	// If a function is called rarely (i.e. not more often than scrapes
-	// happen) or ideally only once (like in a batch job), it can make sense
-	// to use a Gauge for timing the function call. For timing a batch job
-	// and pushing the result to a Pushgateway, see also the comprehensive
-	// example in the push package.
-	funcDuration = prometheus.NewGauge(prometheus.GaugeOpts{
-		Name: "example_function_duration_seconds",
-		Help: "Duration of the last call of an example function.",
-	})
-)
+// If a function is called rarely (i.e. not more often than scrapes
+// happen) or ideally only once (like in a batch job), it can make sense
+// to use a Gauge for timing the function call. For timing a batch job
+// and pushing the result to a Pushgateway, see also the comprehensive
+// example in the push package.
+var funcDuration = prometheus.NewGauge(prometheus.GaugeOpts{
+	Name: "example_function_duration_seconds",
+	Help: "Duration of the last call of an example function.",
+})
 
 func run() error {
 	// The Set method of the Gauge is used to observe the duration.

prometheus/example_timer_test.go

@@ -17,16 +17,14 @@ import (
 	"math/rand"
 	"time"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
 )
 
-var (
-	requestDuration = prometheus.NewHistogram(prometheus.HistogramOpts{
-		Name:    "example_request_duration_seconds",
-		Help:    "Histogram for the runtime of a simple example function.",
-		Buckets: prometheus.LinearBuckets(0.01, 0.01, 10),
-	})
-)
+var requestDuration = prometheus.NewHistogram(prometheus.HistogramOpts{
+	Name:    "example_request_duration_seconds",
+	Help:    "Histogram for the runtime of a simple example function.",
+	Buckets: prometheus.LinearBuckets(0.01, 0.01, 10),
+})
 
 func ExampleTimer() {
 	// timer times this example function. It uses a Histogram, but a Summary

prometheus/examples_test.go

@@ -15,6 +15,7 @@ package prometheus_test
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"math"
 	"net/http"
@@ -24,12 +25,11 @@ import (
 
 	//nolint:staticcheck // Ignore SA1019. Need to keep deprecated package for compatibility.
 	"github.com/golang/protobuf/proto"
+	dto "github.com/prometheus/client_model/go"
 	"github.com/prometheus/common/expfmt"
 
-	dto "github.com/prometheus/client_model/go"
-
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"git.internal/re/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus/promhttp"
 )
 
 func ExampleGauge() {
@@ -599,13 +599,123 @@ func ExampleNewConstHistogram() {
 	// >
 }
 
+func ExampleNewConstHistogram_WithExemplar() {
+	desc := prometheus.NewDesc(
+		"http_request_duration_seconds",
+		"A histogram of the HTTP request durations.",
+		[]string{"code", "method"},
+		prometheus.Labels{"owner": "example"},
+	)
+
+	// Create a constant histogram from values we got from a 3rd party telemetry system.
+	h := prometheus.MustNewConstHistogram(
+		desc,
+		4711, 403.34,
+		map[float64]uint64{25: 121, 50: 2403, 100: 3221, 200: 4233},
+		"200", "get",
+	)
+
+	// Wrap const histogram with exemplars for each bucket.
+	exemplarTs, _ := time.Parse(time.RFC850, "Monday, 02-Jan-06 15:04:05 GMT")
+	exemplarLabels := prometheus.Labels{"testName": "testVal"}
+	h = prometheus.MustNewMetricWithExemplars(
+		h,
+		prometheus.Exemplar{Labels: exemplarLabels, Timestamp: exemplarTs, Value: 24.0},
+		prometheus.Exemplar{Labels: exemplarLabels, Timestamp: exemplarTs, Value: 42.0},
+		prometheus.Exemplar{Labels: exemplarLabels, Timestamp: exemplarTs, Value: 89.0},
+		prometheus.Exemplar{Labels: exemplarLabels, Timestamp: exemplarTs, Value: 157.0},
+	)
+
+	// Just for demonstration, let's check the state of the histogram by
+	// (ab)using its Write method (which is usually only used by Prometheus
+	// internally).
+	metric := &dto.Metric{}
+	h.Write(metric)
+	fmt.Println(proto.MarshalTextString(metric))
+
+	// Output:
+	// label: <
+	//   name: "code"
+	//   value: "200"
+	// >
+	// label: <
+	//   name: "method"
+	//   value: "get"
+	// >
+	// label: <
+	//   name: "owner"
+	//   value: "example"
+	// >
+	// histogram: <
+	//   sample_count: 4711
+	//   sample_sum: 403.34
+	//   bucket: <
+	//     cumulative_count: 121
+	//     upper_bound: 25
+	//     exemplar: <
+	//       label: <
+	//         name: "testName"
+	//         value: "testVal"
+	//       >
+	//       value: 24
+	//       timestamp: <
+	//         seconds: 1136214245
+	//       >
+	//     >
+	//   >
+	//   bucket: <
+	//     cumulative_count: 2403
+	//     upper_bound: 50
+	//     exemplar: <
+	//       label: <
+	//         name: "testName"
+	//         value: "testVal"
+	//       >
+	//       value: 42
+	//       timestamp: <
+	//         seconds: 1136214245
+	//       >
+	//     >
+	//   >
+	//   bucket: <
+	//     cumulative_count: 3221
+	//     upper_bound: 100
+	//     exemplar: <
+	//       label: <
+	//         name: "testName"
+	//         value: "testVal"
+	//       >
+	//       value: 89
+	//       timestamp: <
+	//         seconds: 1136214245
+	//       >
+	//     >
+	//   >
+	//   bucket: <
+	//     cumulative_count: 4233
+	//     upper_bound: 200
+	//     exemplar: <
+	//       label: <
+	//         name: "testName"
+	//         value: "testVal"
+	//       >
+	//       value: 157
+	//       timestamp: <
+	//         seconds: 1136214245
+	//       >
+	//     >
+	//   >
+	// >
+}
+
 func ExampleAlreadyRegisteredError() {
 	reqCounter := prometheus.NewCounter(prometheus.CounterOpts{
 		Name: "requests_total",
 		Help: "The total number of requests served.",
 	})
 	if err := prometheus.Register(reqCounter); err != nil {
-		if are, ok := err.(prometheus.AlreadyRegisteredError); ok {
+		are := &prometheus.AlreadyRegisteredError{}
+		if errors.As(err, are) {
 			// A counter for that metric has been registered before.
 			// Use the old counter from now on.
 			reqCounter = are.ExistingCollector.(prometheus.Counter)

prometheus/expvar_collector_test.go

@@ -21,7 +21,7 @@ import (
 
 	dto "github.com/prometheus/client_model/go"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
 )
 
 func ExampleNewExpvarCollector() {

prometheus/gauge.go

@@ -210,7 +210,8 @@ func (v *GaugeVec) GetMetricWith(labels Labels) (Gauge, error) {
 // WithLabelValues works as GetMetricWithLabelValues, but panics where
 // GetMetricWithLabelValues would have returned an error. Not returning an
 // error allows shortcuts like
-//     myVec.WithLabelValues("404", "GET").Add(42)
+//
+//	myVec.WithLabelValues("404", "GET").Add(42)
 func (v *GaugeVec) WithLabelValues(lvs ...string) Gauge {
 	g, err := v.GetMetricWithLabelValues(lvs...)
 	if err != nil {
@@ -221,7 +222,8 @@ func (v *GaugeVec) WithLabelValues(lvs ...string) Gauge {
 
 // With works as GetMetricWith, but panics where GetMetricWithLabels would have
 // returned an error. Not returning an error allows shortcuts like
-//     myVec.With(prometheus.Labels{"code": "404", "method": "GET"}).Add(42)
+//
+//	myVec.With(prometheus.Labels{"code": "404", "method": "GET"}).Add(42)
 func (v *GaugeVec) With(labels Labels) Gauge {
 	g, err := v.GetMetricWith(labels)
 	if err != nil {

prometheus/gen_go_collector_metrics_set.go

@@ -0,0 +1,178 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build ignore
+// +build ignore
+
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"go/format"
+	"log"
+	"math"
+	"os"
+	"runtime"
+	"runtime/metrics"
+	"strings"
+	"text/template"
+
+	"git.internal/re/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus/internal"
+
+	"github.com/hashicorp/go-version"
+)
+
+func main() {
+	var givenVersion string
+	toolVersion := runtime.Version()
+	if len(os.Args) != 2 {
+		log.Printf("requires Go version (e.g. go1.17) as an argument. Since it is not specified, assuming %s.", toolVersion)
+		givenVersion = toolVersion
+	} else {
+		givenVersion = os.Args[1]
+	}
+	log.Printf("given version for Go: %s", givenVersion)
+	log.Printf("tool version for Go: %s", toolVersion)
+
+	tv, err := version.NewVersion(strings.TrimPrefix(givenVersion, "go"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	gv, err := version.NewVersion(strings.TrimPrefix(toolVersion, "go"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	if !gv.Equal(tv) {
+		log.Fatalf("using Go version %q but expected Go version %q", tv, gv)
+	}
+
+	v := goVersion(gv.Segments()[1])
+	log.Printf("generating metrics for Go version %q", v)
+
+	// Generate code.
+	var buf bytes.Buffer
+	err = testFile.Execute(&buf, struct {
+		Descriptions []metrics.Description
+		GoVersion    goVersion
+		Cardinality  int
+	}{
+		Descriptions: metrics.All(),
+		GoVersion:    v,
+		Cardinality:  rmCardinality(),
+	})
+	if err != nil {
+		log.Fatalf("executing template: %v", err)
+	}
+
+	// Format it.
+	result, err := format.Source(buf.Bytes())
+	if err != nil {
+		log.Fatalf("formatting code: %v", err)
+	}
+
+	// Write it to a file.
+	fname := fmt.Sprintf("go_collector_metrics_%s_test.go", v.Abbr())
+	if err := os.WriteFile(fname, result, 0o644); err != nil {
+		log.Fatalf("writing file: %v", err)
+	}
+}
+
+type goVersion int
+
+func (g goVersion) String() string {
+	return fmt.Sprintf("go1.%d", g)
+}
+
+func (g goVersion) Abbr() string {
+	return fmt.Sprintf("go1%d", g)
+}
+
+func rmCardinality() int {
+	cardinality := 0
+
+	// Collect all histogram samples so that we can get their buckets.
+	// The API guarantees that the buckets are always fixed for the lifetime
+	// of the process.
+	var histograms []metrics.Sample
+	for _, d := range metrics.All() {
+		if d.Kind == metrics.KindFloat64Histogram {
+			histograms = append(histograms, metrics.Sample{Name: d.Name})
+		} else {
+			cardinality++
+		}
+	}
+
+	// Handle histograms.
+	metrics.Read(histograms)
+	for i := range histograms {
+		name := histograms[i].Name
+		buckets := internal.RuntimeMetricsBucketsForUnit(
+			histograms[i].Value.Float64Histogram().Buckets,
+			name[strings.IndexRune(name, ':')+1:],
+		)
+		cardinality += len(buckets) + 3 // Plus total count, sum, and the implicit infinity bucket.
+
+		// runtime/metrics bucket boundaries are lower-bound-inclusive, but
+		// always represents each actual *boundary* so Buckets is always
+		// 1 longer than Counts, while in Prometheus the mapping is one-to-one,
+		// as the bottom bucket extends to -Inf, and the top infinity bucket is
+		// implicit. Therefore, we should have one fewer bucket than is listed
+		// above.
+		cardinality--
+		if buckets[len(buckets)-1] == math.Inf(1) {
+			// We already counted the infinity bucket separately.
+			cardinality--
+		}
+		// Prometheus also doesn't have buckets for -Inf, so they need to be omitted.
+		// See the following PR for more information:
+		// https://git.internal/re/client_golang/pull/1049
+		if buckets[0] == math.Inf(-1) {
+			cardinality--
+		}
+	}
+
+	return cardinality
+}
+
+var testFile = template.Must(template.New("testFile").Funcs(map[string]interface{}{
+	"rm2prom": func(d metrics.Description) string {
+		ns, ss, n, ok := internal.RuntimeMetricsToProm(&d)
+		if !ok {
+			return ""
+		}
+		return prometheus.BuildFQName(ns, ss, n)
+	},
+	"nextVersion": func(version goVersion) string {
+		return (version + goVersion(1)).String()
+	},
+}).Parse(`// Code generated by gen_go_collector_metrics_set.go; DO NOT EDIT.
+//go:generate go run gen_go_collector_metrics_set.go {{.GoVersion}}
+
+//go:build {{.GoVersion}} && !{{nextVersion .GoVersion}}
+// +build {{.GoVersion}},!{{nextVersion .GoVersion}}
+
+package prometheus
+
+var expectedRuntimeMetrics = map[string]string{
+{{- range .Descriptions -}}
+	{{- $trans := rm2prom . -}}
+	{{- if ne $trans "" }}
+	{{.Name | printf "%q"}}: {{$trans | printf "%q"}},
+	{{- end -}}
+{{end}}
+}
+
+const expectedRuntimeMetricsCardinality = {{.Cardinality}}
+`))

prometheus/get_pid.go

@@ -1,4 +1,4 @@
-// Copyright 2021 The Prometheus Authors
+// Copyright 2015 The Prometheus Authors
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
@@ -11,16 +11,16 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !go1.15
+//go:build !js || wasm
+// +build !js wasm
 
-package collectors
+package prometheus
 
-import (
-	"database/sql"
+import "os"
 
-	"github.com/prometheus/client_golang/prometheus"
-)
-
-func (c *dbStatsCollector) describeNewInGo115(ch chan<- *prometheus.Desc) {}
-
-func (c *dbStatsCollector) collectNewInGo115(ch chan<- prometheus.Metric, stats sql.DBStats) {}
+func getPIDFn() func() (int, error) {
+	pid := os.Getpid()
+	return func() (int, error) {
+		return pid, nil
+	}
+}

prometheus/get_pid_gopherjs.go

@@ -0,0 +1,23 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build js && !wasm
+// +build js,!wasm
+
+package prometheus
+
+func getPIDFn() func() (int, error) {
+	return func() (int, error) {
+		return 1, nil
+	}
+}

prometheus/go_collector.go

@@ -16,32 +16,205 @@ package prometheus
 import (
 	"runtime"
 	"runtime/debug"
-	"sync"
 	"time"
 )
 
-type goCollector struct {
+// goRuntimeMemStats provides the metrics initially provided by runtime.ReadMemStats.
+// From Go 1.17 those similar (and better) statistics are provided by runtime/metrics, so
+// while eval closure works on runtime.MemStats, the struct from Go 1.17+ is
+// populated using runtime/metrics.
+func goRuntimeMemStats() memStatsMetrics {
+	return memStatsMetrics{
+		{
+			desc: NewDesc(
+				memstatNamespace("alloc_bytes"),
+				"Number of bytes allocated and still in use.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.Alloc) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("alloc_bytes_total"),
+				"Total number of bytes allocated, even if freed.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.TotalAlloc) },
+			valType: CounterValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("sys_bytes"),
+				"Number of bytes obtained from system.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.Sys) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("lookups_total"),
+				"Total number of pointer lookups.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.Lookups) },
+			valType: CounterValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("mallocs_total"),
+				"Total number of mallocs.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.Mallocs) },
+			valType: CounterValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("frees_total"),
+				"Total number of frees.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.Frees) },
+			valType: CounterValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("heap_alloc_bytes"),
+				"Number of heap bytes allocated and still in use.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.HeapAlloc) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("heap_sys_bytes"),
+				"Number of heap bytes obtained from system.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.HeapSys) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("heap_idle_bytes"),
+				"Number of heap bytes waiting to be used.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.HeapIdle) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("heap_inuse_bytes"),
+				"Number of heap bytes that are in use.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.HeapInuse) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("heap_released_bytes"),
+				"Number of heap bytes released to OS.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.HeapReleased) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("heap_objects"),
+				"Number of allocated objects.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.HeapObjects) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("stack_inuse_bytes"),
+				"Number of bytes in use by the stack allocator.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.StackInuse) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("stack_sys_bytes"),
+				"Number of bytes obtained from system for stack allocator.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.StackSys) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("mspan_inuse_bytes"),
+				"Number of bytes in use by mspan structures.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.MSpanInuse) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("mspan_sys_bytes"),
+				"Number of bytes used for mspan structures obtained from system.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.MSpanSys) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("mcache_inuse_bytes"),
+				"Number of bytes in use by mcache structures.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.MCacheInuse) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("mcache_sys_bytes"),
+				"Number of bytes used for mcache structures obtained from system.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.MCacheSys) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("buck_hash_sys_bytes"),
+				"Number of bytes used by the profiling bucket hash table.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.BuckHashSys) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("gc_sys_bytes"),
+				"Number of bytes used for garbage collection system metadata.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.GCSys) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("other_sys_bytes"),
+				"Number of bytes used for other system allocations.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.OtherSys) },
+			valType: GaugeValue,
+		}, {
+			desc: NewDesc(
+				memstatNamespace("next_gc_bytes"),
+				"Number of heap bytes when next garbage collection will take place.",
+				nil, nil,
+			),
+			eval:    func(ms *runtime.MemStats) float64 { return float64(ms.NextGC) },
+			valType: GaugeValue,
+		},
+	}
+}
+
+type baseGoCollector struct {
 	goroutinesDesc *Desc
 	threadsDesc    *Desc
 	gcDesc         *Desc
+	gcLastTimeDesc *Desc
 	goInfoDesc     *Desc
-
-	// ms... are memstats related.
-	msLast          *runtime.MemStats // Previously collected memstats.
-	msLastTimestamp time.Time
-	msMtx           sync.Mutex // Protects msLast and msLastTimestamp.
-	msMetrics       memStatsMetrics
-	msRead          func(*runtime.MemStats) // For mocking in tests.
-	msMaxWait       time.Duration           // Wait time for fresh memstats.
-	msMaxAge        time.Duration           // Maximum allowed age of old memstats.
 }
 
-// NewGoCollector is the obsolete version of collectors.NewGoCollector.
-// See there for documentation.
-//
-// Deprecated: Use collectors.NewGoCollector instead.
-func NewGoCollector() Collector {
-	return &goCollector{
+func newBaseGoCollector() baseGoCollector {
+	return baseGoCollector{
 		goroutinesDesc: NewDesc(
 			"go_goroutines",
 			"Number of goroutines that currently exist.",
@@ -54,246 +227,32 @@ func NewGoCollector() Collector {
 			"go_gc_duration_seconds",
 			"A summary of the pause duration of garbage collection cycles.",
 			nil, nil),
+		gcLastTimeDesc: NewDesc(
+			"go_memstats_last_gc_time_seconds",
+			"Number of seconds since 1970 of last garbage collection.",
+			nil, nil),
 		goInfoDesc: NewDesc(
 			"go_info",
 			"Information about the Go environment.",
 			nil, Labels{"version": runtime.Version()}),
-		msLast:    &runtime.MemStats{},
-		msRead:    runtime.ReadMemStats,
-		msMaxWait: time.Second,
-		msMaxAge:  5 * time.Minute,
-		msMetrics: memStatsMetrics{
-			{
-				desc: NewDesc(
-					memstatNamespace("alloc_bytes"),
-					"Number of bytes allocated and still in use.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.Alloc) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("alloc_bytes_total"),
-					"Total number of bytes allocated, even if freed.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.TotalAlloc) },
-				valType: CounterValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("sys_bytes"),
-					"Number of bytes obtained from system.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.Sys) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("lookups_total"),
-					"Total number of pointer lookups.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.Lookups) },
-				valType: CounterValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("mallocs_total"),
-					"Total number of mallocs.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.Mallocs) },
-				valType: CounterValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("frees_total"),
-					"Total number of frees.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.Frees) },
-				valType: CounterValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("heap_alloc_bytes"),
-					"Number of heap bytes allocated and still in use.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.HeapAlloc) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("heap_sys_bytes"),
-					"Number of heap bytes obtained from system.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.HeapSys) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("heap_idle_bytes"),
-					"Number of heap bytes waiting to be used.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.HeapIdle) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("heap_inuse_bytes"),
-					"Number of heap bytes that are in use.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.HeapInuse) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("heap_released_bytes"),
-					"Number of heap bytes released to OS.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.HeapReleased) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("heap_objects"),
-					"Number of allocated objects.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.HeapObjects) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("stack_inuse_bytes"),
-					"Number of bytes in use by the stack allocator.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.StackInuse) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("stack_sys_bytes"),
-					"Number of bytes obtained from system for stack allocator.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.StackSys) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("mspan_inuse_bytes"),
-					"Number of bytes in use by mspan structures.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.MSpanInuse) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("mspan_sys_bytes"),
-					"Number of bytes used for mspan structures obtained from system.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.MSpanSys) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("mcache_inuse_bytes"),
-					"Number of bytes in use by mcache structures.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.MCacheInuse) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("mcache_sys_bytes"),
-					"Number of bytes used for mcache structures obtained from system.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.MCacheSys) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("buck_hash_sys_bytes"),
-					"Number of bytes used by the profiling bucket hash table.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.BuckHashSys) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("gc_sys_bytes"),
-					"Number of bytes used for garbage collection system metadata.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.GCSys) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("other_sys_bytes"),
-					"Number of bytes used for other system allocations.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.OtherSys) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("next_gc_bytes"),
-					"Number of heap bytes when next garbage collection will take place.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.NextGC) },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("last_gc_time_seconds"),
-					"Number of seconds since 1970 of last garbage collection.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return float64(ms.LastGC) / 1e9 },
-				valType: GaugeValue,
-			}, {
-				desc: NewDesc(
-					memstatNamespace("gc_cpu_fraction"),
-					"The fraction of this program's available CPU time used by the GC since the program started.",
-					nil, nil,
-				),
-				eval:    func(ms *runtime.MemStats) float64 { return ms.GCCPUFraction },
-				valType: GaugeValue,
-			},
-		},
 	}
 }
 
-func memstatNamespace(s string) string {
-	return "go_memstats_" + s
-}
-
 // Describe returns all descriptions of the collector.
-func (c *goCollector) Describe(ch chan<- *Desc) {
+func (c *baseGoCollector) Describe(ch chan<- *Desc) {
 	ch <- c.goroutinesDesc
 	ch <- c.threadsDesc
 	ch <- c.gcDesc
+	ch <- c.gcLastTimeDesc
 	ch <- c.goInfoDesc
-	for _, i := range c.msMetrics {
-		ch <- i.desc
-	}
 }
 
 // Collect returns the current state of all metrics of the collector.
-func (c *goCollector) Collect(ch chan<- Metric) {
-	var (
-		ms   = &runtime.MemStats{}
-		done = make(chan struct{})
-	)
-	// Start reading memstats first as it might take a while.
-	go func() {
-		c.msRead(ms)
-		c.msMtx.Lock()
-		c.msLast = ms
-		c.msLastTimestamp = time.Now()
-		c.msMtx.Unlock()
-		close(done)
-	}()
-
+func (c *baseGoCollector) Collect(ch chan<- Metric) {
 	ch <- MustNewConstMetric(c.goroutinesDesc, GaugeValue, float64(runtime.NumGoroutine()))
-	n, _ := runtime.ThreadCreateProfile(nil)
-	ch <- MustNewConstMetric(c.threadsDesc, GaugeValue, float64(n))
+
+	n := getRuntimeNumThreads()
+	ch <- MustNewConstMetric(c.threadsDesc, GaugeValue, n)
 
 	var stats debug.GCStats
 	stats.PauseQuantiles = make([]time.Duration, 5)
@@ -305,63 +264,18 @@ func (c *goCollector) Collect(ch chan<- Metric) {
 	}
 	quantiles[0.0] = stats.PauseQuantiles[0].Seconds()
 	ch <- MustNewConstSummary(c.gcDesc, uint64(stats.NumGC), stats.PauseTotal.Seconds(), quantiles)
-
+	ch <- MustNewConstMetric(c.gcLastTimeDesc, GaugeValue, float64(stats.LastGC.UnixNano())/1e9)
 	ch <- MustNewConstMetric(c.goInfoDesc, GaugeValue, 1)
-
-	timer := time.NewTimer(c.msMaxWait)
-	select {
-	case <-done: // Our own ReadMemStats succeeded in time. Use it.
-		timer.Stop() // Important for high collection frequencies to not pile up timers.
-		c.msCollect(ch, ms)
-		return
-	case <-timer.C: // Time out, use last memstats if possible. Continue below.
-	}
-	c.msMtx.Lock()
-	if time.Since(c.msLastTimestamp) < c.msMaxAge {
-		// Last memstats are recent enough. Collect from them under the lock.
-		c.msCollect(ch, c.msLast)
-		c.msMtx.Unlock()
-		return
-	}
-	// If we are here, the last memstats are too old or don't exist. We have
-	// to wait until our own ReadMemStats finally completes. For that to
-	// happen, we have to release the lock.
-	c.msMtx.Unlock()
-	<-done
-	c.msCollect(ch, ms)
 }
 
-func (c *goCollector) msCollect(ch chan<- Metric, ms *runtime.MemStats) {
-	for _, i := range c.msMetrics {
-		ch <- MustNewConstMetric(i.desc, i.valType, i.eval(ms))
-	}
+func memstatNamespace(s string) string {
+	return "go_memstats_" + s
 }
 
-// memStatsMetrics provide description, value, and value type for memstat metrics.
+// memStatsMetrics provide description, evaluator, runtime/metrics name, and
+// value type for memstat metrics.
 type memStatsMetrics []struct {
 	desc    *Desc
 	eval    func(*runtime.MemStats) float64
 	valType ValueType
 }
-
-// NewBuildInfoCollector is the obsolete version of collectors.NewBuildInfoCollector.
-// See there for documentation.
-//
-// Deprecated: Use collectors.NewBuildInfoCollector instead.
-func NewBuildInfoCollector() Collector {
-	path, version, sum := "unknown", "unknown", "unknown"
-	if bi, ok := debug.ReadBuildInfo(); ok {
-		path = bi.Main.Path
-		version = bi.Main.Version
-		sum = bi.Main.Sum
-	}
-	c := &selfCollector{MustNewConstMetric(
-		NewDesc(
-			"go_build_info",
-			"Build information about the main Go module.",
-			nil, Labels{"path": path, "version": version, "checksum": sum},
-		),
-		GaugeValue, 1)}
-	c.init(c.self)
-	return c
-}

prometheus/go_collector_go116.go

@@ -0,0 +1,122 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !go1.17
+// +build !go1.17
+
+package prometheus
+
+import (
+	"runtime"
+	"sync"
+	"time"
+)
+
+type goCollector struct {
+	base baseGoCollector
+
+	// ms... are memstats related.
+	msLast          *runtime.MemStats // Previously collected memstats.
+	msLastTimestamp time.Time
+	msMtx           sync.Mutex // Protects msLast and msLastTimestamp.
+	msMetrics       memStatsMetrics
+	msRead          func(*runtime.MemStats) // For mocking in tests.
+	msMaxWait       time.Duration           // Wait time for fresh memstats.
+	msMaxAge        time.Duration           // Maximum allowed age of old memstats.
+}
+
+// NewGoCollector is the obsolete version of collectors.NewGoCollector.
+// See there for documentation.
+//
+// Deprecated: Use collectors.NewGoCollector instead.
+func NewGoCollector() Collector {
+	msMetrics := goRuntimeMemStats()
+	msMetrics = append(msMetrics, struct {
+		desc    *Desc
+		eval    func(*runtime.MemStats) float64
+		valType ValueType
+	}{
+		// This metric is omitted in Go1.17+, see https://git.internal/re/client_golang/issues/842#issuecomment-861812034
+		desc: NewDesc(
+			memstatNamespace("gc_cpu_fraction"),
+			"The fraction of this program's available CPU time used by the GC since the program started.",
+			nil, nil,
+		),
+		eval:    func(ms *runtime.MemStats) float64 { return ms.GCCPUFraction },
+		valType: GaugeValue,
+	})
+	return &goCollector{
+		base:      newBaseGoCollector(),
+		msLast:    &runtime.MemStats{},
+		msRead:    runtime.ReadMemStats,
+		msMaxWait: time.Second,
+		msMaxAge:  5 * time.Minute,
+		msMetrics: msMetrics,
+	}
+}
+
+// Describe returns all descriptions of the collector.
+func (c *goCollector) Describe(ch chan<- *Desc) {
+	c.base.Describe(ch)
+	for _, i := range c.msMetrics {
+		ch <- i.desc
+	}
+}
+
+// Collect returns the current state of all metrics of the collector.
+func (c *goCollector) Collect(ch chan<- Metric) {
+	var (
+		ms   = &runtime.MemStats{}
+		done = make(chan struct{})
+	)
+	// Start reading memstats first as it might take a while.
+	go func() {
+		c.msRead(ms)
+		c.msMtx.Lock()
+		c.msLast = ms
+		c.msLastTimestamp = time.Now()
+		c.msMtx.Unlock()
+		close(done)
+	}()
+
+	// Collect base non-memory metrics.
+	c.base.Collect(ch)
+
+	timer := time.NewTimer(c.msMaxWait)
+	select {
+	case <-done: // Our own ReadMemStats succeeded in time. Use it.
+		timer.Stop() // Important for high collection frequencies to not pile up timers.
+		c.msCollect(ch, ms)
+		return
+	case <-timer.C: // Time out, use last memstats if possible. Continue below.
+	}
+	c.msMtx.Lock()
+	if time.Since(c.msLastTimestamp) < c.msMaxAge {
+		// Last memstats are recent enough. Collect from them under the lock.
+		c.msCollect(ch, c.msLast)
+		c.msMtx.Unlock()
+		return
+	}
+	// If we are here, the last memstats are too old or don't exist. We have
+	// to wait until our own ReadMemStats finally completes. For that to
+	// happen, we have to release the lock.
+	c.msMtx.Unlock()
+	<-done
+	c.msCollect(ch, ms)
+}
+
+func (c *goCollector) msCollect(ch chan<- Metric, ms *runtime.MemStats) {
+	for _, i := range c.msMetrics {
+		ch <- MustNewConstMetric(i.desc, i.valType, i.eval(ms))
+	}
+}

prometheus/go_collector_go116_test.go

@@ -0,0 +1,118 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !go1.17
+// +build !go1.17
+
+package prometheus
+
+import (
+	"runtime"
+	"testing"
+	"time"
+
+	dto "github.com/prometheus/client_model/go"
+)
+
+func TestGoCollectorMemStats(t *testing.T) {
+	var (
+		c   = NewGoCollector().(*goCollector)
+		got uint64
+	)
+
+	checkCollect := func(want uint64) {
+		metricCh := make(chan Metric)
+		endCh := make(chan struct{})
+
+		go func() {
+			c.Collect(metricCh)
+			close(endCh)
+		}()
+	Collect:
+		for {
+			select {
+			case metric := <-metricCh:
+				if metric.Desc().fqName != "go_memstats_alloc_bytes" {
+					continue Collect
+				}
+				pb := &dto.Metric{}
+				metric.Write(pb)
+				got = uint64(pb.GetGauge().GetValue())
+			case <-endCh:
+				break Collect
+			}
+		}
+		if want != got {
+			t.Errorf("unexpected value of go_memstats_alloc_bytes, want %d, got %d", want, got)
+		}
+	}
+
+	// Speed up the timing to make the test faster.
+	c.msMaxWait = 5 * time.Millisecond
+	c.msMaxAge = 50 * time.Millisecond
+
+	// Scenario 1: msRead responds slowly, no previous memstats available,
+	// msRead is executed anyway.
+	c.msRead = func(ms *runtime.MemStats) {
+		time.Sleep(20 * time.Millisecond)
+		ms.Alloc = 1
+	}
+	checkCollect(1)
+	// Now msLast is set.
+	c.msMtx.Lock()
+	if want, got := uint64(1), c.msLast.Alloc; want != got {
+		t.Errorf("unexpected of msLast.Alloc, want %d, got %d", want, got)
+	}
+	c.msMtx.Unlock()
+
+	// Scenario 2: msRead responds fast, previous memstats available, new
+	// value collected.
+	c.msRead = func(ms *runtime.MemStats) {
+		ms.Alloc = 2
+	}
+	checkCollect(2)
+	// msLast is set, too.
+	c.msMtx.Lock()
+	if want, got := uint64(2), c.msLast.Alloc; want != got {
+		t.Errorf("unexpected of msLast.Alloc, want %d, got %d", want, got)
+	}
+	c.msMtx.Unlock()
+
+	// Scenario 3: msRead responds slowly, previous memstats available, old
+	// value collected.
+	c.msRead = func(ms *runtime.MemStats) {
+		time.Sleep(20 * time.Millisecond)
+		ms.Alloc = 3
+	}
+	checkCollect(2)
+	// After waiting, new value is still set in msLast.
+	time.Sleep(80 * time.Millisecond)
+	c.msMtx.Lock()
+	if want, got := uint64(3), c.msLast.Alloc; want != got {
+		t.Errorf("unexpected of msLast.Alloc, want %d, got %d", want, got)
+	}
+	c.msMtx.Unlock()
+
+	// Scenario 4: msRead responds slowly, previous memstats is too old, new
+	// value collected.
+	c.msRead = func(ms *runtime.MemStats) {
+		time.Sleep(20 * time.Millisecond)
+		ms.Alloc = 4
+	}
+	checkCollect(4)
+	c.msMtx.Lock()
+	if want, got := uint64(4), c.msLast.Alloc; want != got {
+		t.Errorf("unexpected of msLast.Alloc, want %d, got %d", want, got)
+	}
+	c.msMtx.Unlock()
+}

prometheus/go_collector_latest.go

@@ -0,0 +1,568 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build go1.17
+// +build go1.17
+
+package prometheus
+
+import (
+	"math"
+	"runtime"
+	"runtime/metrics"
+	"strings"
+	"sync"
+
+	//nolint:staticcheck // Ignore SA1019. Need to keep deprecated package for compatibility.
+	"github.com/golang/protobuf/proto"
+	dto "github.com/prometheus/client_model/go"
+
+	"git.internal/re/client_golang/prometheus/internal"
+)
+
+const (
+	// constants for strings referenced more than once.
+	goGCHeapTinyAllocsObjects               = "/gc/heap/tiny/allocs:objects"
+	goGCHeapAllocsObjects                   = "/gc/heap/allocs:objects"
+	goGCHeapFreesObjects                    = "/gc/heap/frees:objects"
+	goGCHeapFreesBytes                      = "/gc/heap/frees:bytes"
+	goGCHeapAllocsBytes                     = "/gc/heap/allocs:bytes"
+	goGCHeapObjects                         = "/gc/heap/objects:objects"
+	goGCHeapGoalBytes                       = "/gc/heap/goal:bytes"
+	goMemoryClassesTotalBytes               = "/memory/classes/total:bytes"
+	goMemoryClassesHeapObjectsBytes         = "/memory/classes/heap/objects:bytes"
+	goMemoryClassesHeapUnusedBytes          = "/memory/classes/heap/unused:bytes"
+	goMemoryClassesHeapReleasedBytes        = "/memory/classes/heap/released:bytes"
+	goMemoryClassesHeapFreeBytes            = "/memory/classes/heap/free:bytes"
+	goMemoryClassesHeapStacksBytes          = "/memory/classes/heap/stacks:bytes"
+	goMemoryClassesOSStacksBytes            = "/memory/classes/os-stacks:bytes"
+	goMemoryClassesMetadataMSpanInuseBytes  = "/memory/classes/metadata/mspan/inuse:bytes"
+	goMemoryClassesMetadataMSPanFreeBytes   = "/memory/classes/metadata/mspan/free:bytes"
+	goMemoryClassesMetadataMCacheInuseBytes = "/memory/classes/metadata/mcache/inuse:bytes"
+	goMemoryClassesMetadataMCacheFreeBytes  = "/memory/classes/metadata/mcache/free:bytes"
+	goMemoryClassesProfilingBucketsBytes    = "/memory/classes/profiling/buckets:bytes"
+	goMemoryClassesMetadataOtherBytes       = "/memory/classes/metadata/other:bytes"
+	goMemoryClassesOtherBytes               = "/memory/classes/other:bytes"
+)
+
+// rmNamesForMemStatsMetrics represents runtime/metrics names required to populate goRuntimeMemStats from like logic.
+var rmNamesForMemStatsMetrics = []string{
+	goGCHeapTinyAllocsObjects,
+	goGCHeapAllocsObjects,
+	goGCHeapFreesObjects,
+	goGCHeapAllocsBytes,
+	goGCHeapObjects,
+	goGCHeapGoalBytes,
+	goMemoryClassesTotalBytes,
+	goMemoryClassesHeapObjectsBytes,
+	goMemoryClassesHeapUnusedBytes,
+	goMemoryClassesHeapReleasedBytes,
+	goMemoryClassesHeapFreeBytes,
+	goMemoryClassesHeapStacksBytes,
+	goMemoryClassesOSStacksBytes,
+	goMemoryClassesMetadataMSpanInuseBytes,
+	goMemoryClassesMetadataMSPanFreeBytes,
+	goMemoryClassesMetadataMCacheInuseBytes,
+	goMemoryClassesMetadataMCacheFreeBytes,
+	goMemoryClassesProfilingBucketsBytes,
+	goMemoryClassesMetadataOtherBytes,
+	goMemoryClassesOtherBytes,
+}
+
+func bestEffortLookupRM(lookup []string) []metrics.Description {
+	ret := make([]metrics.Description, 0, len(lookup))
+	for _, rm := range metrics.All() {
+		for _, m := range lookup {
+			if m == rm.Name {
+				ret = append(ret, rm)
+			}
+		}
+	}
+	return ret
+}
+
+type goCollector struct {
+	base baseGoCollector
+
+	// mu protects updates to all fields ensuring a consistent
+	// snapshot is always produced by Collect.
+	mu sync.Mutex
+
+	// Contains all samples that has to retrieved from runtime/metrics (not all of them will be exposed).
+	sampleBuf []metrics.Sample
+	// sampleMap allows lookup for MemStats metrics and runtime/metrics histograms for exact sums.
+	sampleMap map[string]*metrics.Sample
+
+	// rmExposedMetrics represents all runtime/metrics package metrics
+	// that were configured to be exposed.
+	rmExposedMetrics     []collectorMetric
+	rmExactSumMapForHist map[string]string
+
+	// With Go 1.17, the runtime/metrics package was introduced.
+	// From that point on, metric names produced by the runtime/metrics
+	// package could be generated from runtime/metrics names. However,
+	// these differ from the old names for the same values.
+	//
+	// This field exists to export the same values under the old names
+	// as well.
+	msMetrics        memStatsMetrics
+	msMetricsEnabled bool
+}
+
+type rmMetricDesc struct {
+	metrics.Description
+}
+
+func matchRuntimeMetricsRules(rules []internal.GoCollectorRule) []rmMetricDesc {
+	var descs []rmMetricDesc
+	for _, d := range metrics.All() {
+		var (
+			deny = true
+			desc rmMetricDesc
+		)
+
+		for _, r := range rules {
+			if !r.Matcher.MatchString(d.Name) {
+				continue
+			}
+			deny = r.Deny
+		}
+		if deny {
+			continue
+		}
+
+		desc.Description = d
+		descs = append(descs, desc)
+	}
+	return descs
+}
+
+func defaultGoCollectorOptions() internal.GoCollectorOptions {
+	return internal.GoCollectorOptions{
+		RuntimeMetricSumForHist: map[string]string{
+			"/gc/heap/allocs-by-size:bytes": goGCHeapAllocsBytes,
+			"/gc/heap/frees-by-size:bytes":  goGCHeapFreesBytes,
+		},
+		RuntimeMetricRules: []internal.GoCollectorRule{
+			//{Matcher: regexp.MustCompile("")},
+		},
+	}
+}
+
+// NewGoCollector is the obsolete version of collectors.NewGoCollector.
+// See there for documentation.
+//
+// Deprecated: Use collectors.NewGoCollector instead.
+func NewGoCollector(opts ...func(o *internal.GoCollectorOptions)) Collector {
+	opt := defaultGoCollectorOptions()
+	for _, o := range opts {
+		o(&opt)
+	}
+
+	exposedDescriptions := matchRuntimeMetricsRules(opt.RuntimeMetricRules)
+
+	// Collect all histogram samples so that we can get their buckets.
+	// The API guarantees that the buckets are always fixed for the lifetime
+	// of the process.
+	var histograms []metrics.Sample
+	for _, d := range exposedDescriptions {
+		if d.Kind == metrics.KindFloat64Histogram {
+			histograms = append(histograms, metrics.Sample{Name: d.Name})
+		}
+	}
+
+	if len(histograms) > 0 {
+		metrics.Read(histograms)
+	}
+
+	bucketsMap := make(map[string][]float64)
+	for i := range histograms {
+		bucketsMap[histograms[i].Name] = histograms[i].Value.Float64Histogram().Buckets
+	}
+
+	// Generate a collector for each exposed runtime/metrics metric.
+	metricSet := make([]collectorMetric, 0, len(exposedDescriptions))
+	// SampleBuf is used for reading from runtime/metrics.
+	// We are assuming the largest case to have stable pointers for sampleMap purposes.
+	sampleBuf := make([]metrics.Sample, 0, len(exposedDescriptions)+len(opt.RuntimeMetricSumForHist)+len(rmNamesForMemStatsMetrics))
+	sampleMap := make(map[string]*metrics.Sample, len(exposedDescriptions))
+	for _, d := range exposedDescriptions {
+		namespace, subsystem, name, ok := internal.RuntimeMetricsToProm(&d.Description)
+		if !ok {
+			// Just ignore this metric; we can't do anything with it here.
+			// If a user decides to use the latest version of Go, we don't want
+			// to fail here. This condition is tested in TestExpectedRuntimeMetrics.
+			continue
+		}
+
+		sampleBuf = append(sampleBuf, metrics.Sample{Name: d.Name})
+		sampleMap[d.Name] = &sampleBuf[len(sampleBuf)-1]
+
+		var m collectorMetric
+		if d.Kind == metrics.KindFloat64Histogram {
+			_, hasSum := opt.RuntimeMetricSumForHist[d.Name]
+			unit := d.Name[strings.IndexRune(d.Name, ':')+1:]
+			m = newBatchHistogram(
+				NewDesc(
+					BuildFQName(namespace, subsystem, name),
+					d.Description.Description,
+					nil,
+					nil,
+				),
+				internal.RuntimeMetricsBucketsForUnit(bucketsMap[d.Name], unit),
+				hasSum,
+			)
+		} else if d.Cumulative {
+			m = NewCounter(CounterOpts{
+				Namespace: namespace,
+				Subsystem: subsystem,
+				Name:      name,
+				Help:      d.Description.Description,
+			},
+			)
+		} else {
+			m = NewGauge(GaugeOpts{
+				Namespace: namespace,
+				Subsystem: subsystem,
+				Name:      name,
+				Help:      d.Description.Description,
+			})
+		}
+		metricSet = append(metricSet, m)
+	}
+
+	// Add exact sum metrics to sampleBuf if not added before.
+	for _, h := range histograms {
+		sumMetric, ok := opt.RuntimeMetricSumForHist[h.Name]
+		if !ok {
+			continue
+		}
+
+		if _, ok := sampleMap[sumMetric]; ok {
+			continue
+		}
+		sampleBuf = append(sampleBuf, metrics.Sample{Name: sumMetric})
+		sampleMap[sumMetric] = &sampleBuf[len(sampleBuf)-1]
+	}
+
+	var (
+		msMetrics      memStatsMetrics
+		msDescriptions []metrics.Description
+	)
+
+	if !opt.DisableMemStatsLikeMetrics {
+		msMetrics = goRuntimeMemStats()
+		msDescriptions = bestEffortLookupRM(rmNamesForMemStatsMetrics)
+
+		// Check if metric was not exposed before and if not, add to sampleBuf.
+		for _, mdDesc := range msDescriptions {
+			if _, ok := sampleMap[mdDesc.Name]; ok {
+				continue
+			}
+			sampleBuf = append(sampleBuf, metrics.Sample{Name: mdDesc.Name})
+			sampleMap[mdDesc.Name] = &sampleBuf[len(sampleBuf)-1]
+		}
+	}
+
+	return &goCollector{
+		base:                 newBaseGoCollector(),
+		sampleBuf:            sampleBuf,
+		sampleMap:            sampleMap,
+		rmExposedMetrics:     metricSet,
+		rmExactSumMapForHist: opt.RuntimeMetricSumForHist,
+		msMetrics:            msMetrics,
+		msMetricsEnabled:     !opt.DisableMemStatsLikeMetrics,
+	}
+}
+
+// Describe returns all descriptions of the collector.
+func (c *goCollector) Describe(ch chan<- *Desc) {
+	c.base.Describe(ch)
+	for _, i := range c.msMetrics {
+		ch <- i.desc
+	}
+	for _, m := range c.rmExposedMetrics {
+		ch <- m.Desc()
+	}
+}
+
+// Collect returns the current state of all metrics of the collector.
+func (c *goCollector) Collect(ch chan<- Metric) {
+	// Collect base non-memory metrics.
+	c.base.Collect(ch)
+
+	if len(c.sampleBuf) == 0 {
+		return
+	}
+
+	// Collect must be thread-safe, so prevent concurrent use of
+	// sampleBuf elements. Just read into sampleBuf but write all the data
+	// we get into our Metrics or MemStats.
+	//
+	// This lock also ensures that the Metrics we send out are all from
+	// the same updates, ensuring their mutual consistency insofar as
+	// is guaranteed by the runtime/metrics package.
+	//
+	// N.B. This locking is heavy-handed, but Collect is expected to be called
+	// relatively infrequently. Also the core operation here, metrics.Read,
+	// is fast (O(tens of microseconds)) so contention should certainly be
+	// low, though channel operations and any allocations may add to that.
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	// Populate runtime/metrics sample buffer.
+	metrics.Read(c.sampleBuf)
+
+	// Collect all our runtime/metrics user chose to expose from sampleBuf (if any).
+	for i, metric := range c.rmExposedMetrics {
+		// We created samples for exposed metrics first in order, so indexes match.
+		sample := c.sampleBuf[i]
+
+		// N.B. switch on concrete type because it's significantly more efficient
+		// than checking for the Counter and Gauge interface implementations. In
+		// this case, we control all the types here.
+		switch m := metric.(type) {
+		case *counter:
+			// Guard against decreases. This should never happen, but a failure
+			// to do so will result in a panic, which is a harsh consequence for
+			// a metrics collection bug.
+			v0, v1 := m.get(), unwrapScalarRMValue(sample.Value)
+			if v1 > v0 {
+				m.Add(unwrapScalarRMValue(sample.Value) - m.get())
+			}
+			m.Collect(ch)
+		case *gauge:
+			m.Set(unwrapScalarRMValue(sample.Value))
+			m.Collect(ch)
+		case *batchHistogram:
+			m.update(sample.Value.Float64Histogram(), c.exactSumFor(sample.Name))
+			m.Collect(ch)
+		default:
+			panic("unexpected metric type")
+		}
+	}
+
+	if c.msMetricsEnabled {
+		// ms is a dummy MemStats that we populate ourselves so that we can
+		// populate the old metrics from it if goMemStatsCollection is enabled.
+		var ms runtime.MemStats
+		memStatsFromRM(&ms, c.sampleMap)
+		for _, i := range c.msMetrics {
+			ch <- MustNewConstMetric(i.desc, i.valType, i.eval(&ms))
+		}
+	}
+}
+
+// unwrapScalarRMValue unwraps a runtime/metrics value that is assumed
+// to be scalar and returns the equivalent float64 value. Panics if the
+// value is not scalar.
+func unwrapScalarRMValue(v metrics.Value) float64 {
+	switch v.Kind() {
+	case metrics.KindUint64:
+		return float64(v.Uint64())
+	case metrics.KindFloat64:
+		return v.Float64()
+	case metrics.KindBad:
+		// Unsupported metric.
+		//
+		// This should never happen because we always populate our metric
+		// set from the runtime/metrics package.
+		panic("unexpected unsupported metric")
+	default:
+		// Unsupported metric kind.
+		//
+		// This should never happen because we check for this during initialization
+		// and flag and filter metrics whose kinds we don't understand.
+		panic("unexpected unsupported metric kind")
+	}
+}
+
+// exactSumFor takes a runtime/metrics metric name (that is assumed to
+// be of kind KindFloat64Histogram) and returns its exact sum and whether
+// its exact sum exists.
+//
+// The runtime/metrics API for histograms doesn't currently expose exact
+// sums, but some of the other metrics are in fact exact sums of histograms.
+func (c *goCollector) exactSumFor(rmName string) float64 {
+	sumName, ok := c.rmExactSumMapForHist[rmName]
+	if !ok {
+		return 0
+	}
+	s, ok := c.sampleMap[sumName]
+	if !ok {
+		return 0
+	}
+	return unwrapScalarRMValue(s.Value)
+}
+
+func memStatsFromRM(ms *runtime.MemStats, rm map[string]*metrics.Sample) {
+	lookupOrZero := func(name string) uint64 {
+		if s, ok := rm[name]; ok {
+			return s.Value.Uint64()
+		}
+		return 0
+	}
+
+	// Currently, MemStats adds tiny alloc count to both Mallocs AND Frees.
+	// The reason for this is because MemStats couldn't be extended at the time
+	// but there was a desire to have Mallocs at least be a little more representative,
+	// while having Mallocs - Frees still represent a live object count.
+	// Unfortunately, MemStats doesn't actually export a large allocation count,
+	// so it's impossible to pull this number out directly.
+	tinyAllocs := lookupOrZero(goGCHeapTinyAllocsObjects)
+	ms.Mallocs = lookupOrZero(goGCHeapAllocsObjects) + tinyAllocs
+	ms.Frees = lookupOrZero(goGCHeapFreesObjects) + tinyAllocs
+
+	ms.TotalAlloc = lookupOrZero(goGCHeapAllocsBytes)
+	ms.Sys = lookupOrZero(goMemoryClassesTotalBytes)
+	ms.Lookups = 0 // Already always zero.
+	ms.HeapAlloc = lookupOrZero(goMemoryClassesHeapObjectsBytes)
+	ms.Alloc = ms.HeapAlloc
+	ms.HeapInuse = ms.HeapAlloc + lookupOrZero(goMemoryClassesHeapUnusedBytes)
+	ms.HeapReleased = lookupOrZero(goMemoryClassesHeapReleasedBytes)
+	ms.HeapIdle = ms.HeapReleased + lookupOrZero(goMemoryClassesHeapFreeBytes)
+	ms.HeapSys = ms.HeapInuse + ms.HeapIdle
+	ms.HeapObjects = lookupOrZero(goGCHeapObjects)
+	ms.StackInuse = lookupOrZero(goMemoryClassesHeapStacksBytes)
+	ms.StackSys = ms.StackInuse + lookupOrZero(goMemoryClassesOSStacksBytes)
+	ms.MSpanInuse = lookupOrZero(goMemoryClassesMetadataMSpanInuseBytes)
+	ms.MSpanSys = ms.MSpanInuse + lookupOrZero(goMemoryClassesMetadataMSPanFreeBytes)
+	ms.MCacheInuse = lookupOrZero(goMemoryClassesMetadataMCacheInuseBytes)
+	ms.MCacheSys = ms.MCacheInuse + lookupOrZero(goMemoryClassesMetadataMCacheFreeBytes)
+	ms.BuckHashSys = lookupOrZero(goMemoryClassesProfilingBucketsBytes)
+	ms.GCSys = lookupOrZero(goMemoryClassesMetadataOtherBytes)
+	ms.OtherSys = lookupOrZero(goMemoryClassesOtherBytes)
+	ms.NextGC = lookupOrZero(goGCHeapGoalBytes)
+
+	// N.B. GCCPUFraction is intentionally omitted. This metric is not useful,
+	// and often misleading due to the fact that it's an average over the lifetime
+	// of the process.
+	// See https://git.internal/re/client_golang/issues/842#issuecomment-861812034
+	// for more details.
+	ms.GCCPUFraction = 0
+}
+
+// batchHistogram is a mutable histogram that is updated
+// in batches.
+type batchHistogram struct {
+	selfCollector
+
+	// Static fields updated only once.
+	desc   *Desc
+	hasSum bool
+
+	// Because this histogram operates in batches, it just uses a
+	// single mutex for everything. updates are always serialized
+	// but Write calls may operate concurrently with updates.
+	// Contention between these two sources should be rare.
+	mu      sync.Mutex
+	buckets []float64 // Inclusive lower bounds, like runtime/metrics.
+	counts  []uint64
+	sum     float64 // Used if hasSum is true.
+}
+
+// newBatchHistogram creates a new batch histogram value with the given
+// Desc, buckets, and whether or not it has an exact sum available.
+//
+// buckets must always be from the runtime/metrics package, following
+// the same conventions.
+func newBatchHistogram(desc *Desc, buckets []float64, hasSum bool) *batchHistogram {
+	// We need to remove -Inf values. runtime/metrics keeps them around.
+	// But -Inf bucket should not be allowed for prometheus histograms.
+	if buckets[0] == math.Inf(-1) {
+		buckets = buckets[1:]
+	}
+	h := &batchHistogram{
+		desc:    desc,
+		buckets: buckets,
+		// Because buckets follows runtime/metrics conventions, there's
+		// 1 more value in the buckets list than there are buckets represented,
+		// because in runtime/metrics, the bucket values represent *boundaries*,
+		// and non-Inf boundaries are inclusive lower bounds for that bucket.
+		counts: make([]uint64, len(buckets)-1),
+		hasSum: hasSum,
+	}
+	h.init(h)
+	return h
+}
+
+// update updates the batchHistogram from a runtime/metrics histogram.
+//
+// sum must be provided if the batchHistogram was created to have an exact sum.
+// h.buckets must be a strict subset of his.Buckets.
+func (h *batchHistogram) update(his *metrics.Float64Histogram, sum float64) {
+	counts, buckets := his.Counts, his.Buckets
+
+	h.mu.Lock()
+	defer h.mu.Unlock()
+
+	// Clear buckets.
+	for i := range h.counts {
+		h.counts[i] = 0
+	}
+	// Copy and reduce buckets.
+	var j int
+	for i, count := range counts {
+		h.counts[j] += count
+		if buckets[i+1] == h.buckets[j+1] {
+			j++
+		}
+	}
+	if h.hasSum {
+		h.sum = sum
+	}
+}
+
+func (h *batchHistogram) Desc() *Desc {
+	return h.desc
+}
+
+func (h *batchHistogram) Write(out *dto.Metric) error {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+
+	sum := float64(0)
+	if h.hasSum {
+		sum = h.sum
+	}
+	dtoBuckets := make([]*dto.Bucket, 0, len(h.counts))
+	totalCount := uint64(0)
+	for i, count := range h.counts {
+		totalCount += count
+		if !h.hasSum {
+			if count != 0 {
+				// N.B. This computed sum is an underestimate.
+				sum += h.buckets[i] * float64(count)
+			}
+		}
+
+		// Skip the +Inf bucket, but only for the bucket list.
+		// It must still count for sum and totalCount.
+		if math.IsInf(h.buckets[i+1], 1) {
+			break
+		}
+		// Float64Histogram's upper bound is exclusive, so make it inclusive
+		// by obtaining the next float64 value down, in order.
+		upperBound := math.Nextafter(h.buckets[i+1], h.buckets[i])
+		dtoBuckets = append(dtoBuckets, &dto.Bucket{
+			CumulativeCount: proto.Uint64(totalCount),
+			UpperBound:      proto.Float64(upperBound),
+		})
+	}
+	out.Histogram = &dto.Histogram{
+		Bucket:      dtoBuckets,
+		SampleCount: proto.Uint64(totalCount),
+		SampleSum:   proto.Float64(sum),
+	}
+	return nil
+}

prometheus/go_collector_latest_test.go

@@ -0,0 +1,406 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build go1.17
+// +build go1.17
+
+package prometheus
+
+import (
+	"math"
+	"reflect"
+	"regexp"
+	"runtime"
+	"runtime/metrics"
+	"sync"
+	"testing"
+
+	dto "github.com/prometheus/client_model/go"
+
+	"git.internal/re/client_golang/prometheus/internal"
+)
+
+func TestRmForMemStats(t *testing.T) {
+	descs := bestEffortLookupRM(rmNamesForMemStatsMetrics)
+
+	if got, want := len(descs), len(rmNamesForMemStatsMetrics); got != want {
+		t.Errorf("got %d, want %d metrics", got, want)
+	}
+
+	for _, d := range descs {
+		// We don't expect histograms there.
+		if d.Kind == metrics.KindFloat64Histogram {
+			t.Errorf("we don't expect to use histograms for MemStats metrics, got %v", d.Name)
+		}
+	}
+}
+
+func expectedBaseMetrics() map[string]struct{} {
+	metrics := map[string]struct{}{}
+	b := newBaseGoCollector()
+	for _, m := range []string{
+		b.gcDesc.fqName,
+		b.goInfoDesc.fqName,
+		b.goroutinesDesc.fqName,
+		b.gcLastTimeDesc.fqName,
+		b.threadsDesc.fqName,
+	} {
+		metrics[m] = struct{}{}
+	}
+	return metrics
+}
+
+func addExpectedRuntimeMemStats(metrics map[string]struct{}) map[string]struct{} {
+	for _, m := range goRuntimeMemStats() {
+		metrics[m.desc.fqName] = struct{}{}
+	}
+	return metrics
+}
+
+func addExpectedRuntimeMetrics(metrics map[string]struct{}) map[string]struct{} {
+	for _, m := range expectedRuntimeMetrics {
+		metrics[m] = struct{}{}
+	}
+	return metrics
+}
+
+func TestGoCollector_ExposedMetrics(t *testing.T) {
+	for _, tcase := range []struct {
+		opts              internal.GoCollectorOptions
+		expectedFQNameSet map[string]struct{}
+	}{
+		{
+			opts: internal.GoCollectorOptions{
+				DisableMemStatsLikeMetrics: true,
+			},
+			expectedFQNameSet: expectedBaseMetrics(),
+		},
+		{
+			// Default, only MemStats.
+			expectedFQNameSet: addExpectedRuntimeMemStats(expectedBaseMetrics()),
+		},
+		{
+			// Get all runtime/metrics without MemStats.
+			opts: internal.GoCollectorOptions{
+				DisableMemStatsLikeMetrics: true,
+				RuntimeMetricRules: []internal.GoCollectorRule{
+					{Matcher: regexp.MustCompile("/.*")},
+				},
+			},
+			expectedFQNameSet: addExpectedRuntimeMetrics(expectedBaseMetrics()),
+		},
+		{
+			// Get all runtime/metrics and MemStats.
+			opts: internal.GoCollectorOptions{
+				RuntimeMetricRules: []internal.GoCollectorRule{
+					{Matcher: regexp.MustCompile("/.*")},
+				},
+			},
+			expectedFQNameSet: addExpectedRuntimeMemStats(addExpectedRuntimeMetrics(expectedBaseMetrics())),
+		},
+	} {
+		if ok := t.Run("", func(t *testing.T) {
+			goMetrics := collectGoMetrics(t, tcase.opts)
+			goMetricSet := make(map[string]Metric)
+			for _, m := range goMetrics {
+				goMetricSet[m.Desc().fqName] = m
+			}
+
+			for i := range goMetrics {
+				name := goMetrics[i].Desc().fqName
+
+				if _, ok := tcase.expectedFQNameSet[name]; !ok {
+					t.Errorf("found unpexpected metric %s", name)
+					continue
+				}
+			}
+
+			// Now iterate over the expected metrics and look for removals.
+			for expectedName := range tcase.expectedFQNameSet {
+				if _, ok := goMetricSet[expectedName]; !ok {
+					t.Errorf("missing expected metric %s in collection", expectedName)
+					continue
+				}
+			}
+		}); !ok {
+			return
+		}
+	}
+}
+
+var sink interface{}
+
+func TestBatchHistogram(t *testing.T) {
+	goMetrics := collectGoMetrics(t, internal.GoCollectorOptions{
+		RuntimeMetricRules: []internal.GoCollectorRule{
+			{Matcher: regexp.MustCompile("/.*")},
+		},
+	})
+
+	var mhist Metric
+	for _, m := range goMetrics {
+		if m.Desc().fqName == "go_gc_heap_allocs_by_size_bytes" {
+			mhist = m
+			break
+		}
+	}
+	if mhist == nil {
+		t.Fatal("failed to find metric to test")
+	}
+	hist, ok := mhist.(*batchHistogram)
+	if !ok {
+		t.Fatal("found metric is not a runtime/metrics histogram")
+	}
+
+	// Make a bunch of allocations then do another collection.
+	//
+	// The runtime/metrics API tries to reuse memory where possible,
+	// so make sure that we didn't hang on to any of that memory in
+	// hist.
+	countsCopy := make([]uint64, len(hist.counts))
+	copy(countsCopy, hist.counts)
+	for i := 0; i < 100; i++ {
+		sink = make([]byte, 128)
+	}
+
+	collectGoMetrics(t, defaultGoCollectorOptions())
+	for i, v := range hist.counts {
+		if v != countsCopy[i] {
+			t.Error("counts changed during new collection")
+			break
+		}
+	}
+
+	// Get the runtime/metrics copy.
+	s := []metrics.Sample{
+		{Name: "/gc/heap/allocs-by-size:bytes"},
+	}
+	metrics.Read(s)
+	rmHist := s[0].Value.Float64Histogram()
+	wantBuckets := internal.RuntimeMetricsBucketsForUnit(rmHist.Buckets, "bytes")
+	// runtime/metrics histograms always have a +Inf bucket and are lower
+	// bound inclusive. In contrast, we have an implicit +Inf bucket and
+	// are upper bound inclusive, so we can chop off the first bucket
+	// (since the conversion to upper bound inclusive will shift all buckets
+	// down one index) and the +Inf for the last bucket.
+	wantBuckets = wantBuckets[1 : len(wantBuckets)-1]
+
+	// Check to make sure the output proto makes sense.
+	pb := &dto.Metric{}
+	hist.Write(pb)
+
+	if math.IsInf(pb.Histogram.Bucket[len(pb.Histogram.Bucket)-1].GetUpperBound(), +1) {
+		t.Errorf("found +Inf bucket")
+	}
+	if got := len(pb.Histogram.Bucket); got != len(wantBuckets) {
+		t.Errorf("got %d buckets in protobuf, want %d", got, len(wantBuckets))
+	}
+	for i, bucket := range pb.Histogram.Bucket {
+		// runtime/metrics histograms are lower-bound inclusive, but we're
+		// upper-bound inclusive. So just make sure the new inclusive upper
+		// bound is somewhere close by (in some cases it's equal).
+		wantBound := wantBuckets[i]
+		if gotBound := *bucket.UpperBound; (wantBound-gotBound)/wantBound > 0.001 {
+			t.Errorf("got bound %f, want within 0.1%% of %f", gotBound, wantBound)
+		}
+		// Make sure counts are cumulative. Because of the consistency guarantees
+		// made by the runtime/metrics package, we're really not guaranteed to get
+		// anything even remotely the same here.
+		if i > 0 && *bucket.CumulativeCount < *pb.Histogram.Bucket[i-1].CumulativeCount {
+			t.Error("cumulative counts are non-monotonic")
+		}
+	}
+}
+
+func collectGoMetrics(t *testing.T, opts internal.GoCollectorOptions) []Metric {
+	t.Helper()
+
+	c := NewGoCollector(func(o *internal.GoCollectorOptions) {
+		o.DisableMemStatsLikeMetrics = opts.DisableMemStatsLikeMetrics
+		o.RuntimeMetricSumForHist = opts.RuntimeMetricSumForHist
+		o.RuntimeMetricRules = opts.RuntimeMetricRules
+	}).(*goCollector)
+
+	// Collect all metrics.
+	ch := make(chan Metric)
+	var wg sync.WaitGroup
+	var metrics []Metric
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		for metric := range ch {
+			metrics = append(metrics, metric)
+		}
+	}()
+	c.Collect(ch)
+	close(ch)
+
+	wg.Wait()
+
+	return metrics
+}
+
+func TestMemStatsEquivalence(t *testing.T) {
+	var msReal, msFake runtime.MemStats
+	descs := bestEffortLookupRM(rmNamesForMemStatsMetrics)
+
+	samples := make([]metrics.Sample, len(descs))
+	samplesMap := make(map[string]*metrics.Sample)
+	for i := range descs {
+		samples[i].Name = descs[i].Name
+		samplesMap[descs[i].Name] = &samples[i]
+	}
+
+	// Force a GC cycle to try to reach a clean slate.
+	runtime.GC()
+
+	// Populate msReal.
+	runtime.ReadMemStats(&msReal)
+	// Populate msFake and hope that no GC happened in between (:
+	metrics.Read(samples)
+
+	memStatsFromRM(&msFake, samplesMap)
+
+	// Iterate over them and make sure they're somewhat close.
+	msRealValue := reflect.ValueOf(msReal)
+	msFakeValue := reflect.ValueOf(msFake)
+
+	typ := msRealValue.Type()
+	for i := 0; i < msRealValue.NumField(); i++ {
+		fr := msRealValue.Field(i)
+		ff := msFakeValue.Field(i)
+
+		if typ.Field(i).Name == "PauseTotalNs" || typ.Field(i).Name == "LastGC" {
+			// We don't use those fields for metrics,
+			// thus we are not interested in having this filled.
+			continue
+		}
+		switch fr.Kind() {
+		// Fields which we are interested in are all uint64s.
+		// The only float64 field GCCPUFraction is by design omitted.
+		case reflect.Uint64:
+			vr := fr.Interface().(uint64)
+			vf := ff.Interface().(uint64)
+			if float64(vr-vf)/float64(vf) > 0.05 {
+				t.Errorf("wrong value for %s: got %d, want %d", typ.Field(i).Name, vf, vr)
+			}
+		}
+	}
+}
+
+func TestExpectedRuntimeMetrics(t *testing.T) {
+	goMetrics := collectGoMetrics(t, internal.GoCollectorOptions{
+		DisableMemStatsLikeMetrics: true,
+		RuntimeMetricRules: []internal.GoCollectorRule{
+			{Matcher: regexp.MustCompile("/.*")},
+		},
+	})
+	goMetricSet := make(map[string]Metric)
+	for _, m := range goMetrics {
+		goMetricSet[m.Desc().fqName] = m
+	}
+
+	descs := metrics.All()
+	rmSet := make(map[string]struct{})
+	// Iterate over runtime-reported descriptions to find new metrics.
+	for i := range descs {
+		rmName := descs[i].Name
+		rmSet[rmName] = struct{}{}
+
+		// expectedRuntimeMetrics depends on Go version.
+		expFQName, ok := expectedRuntimeMetrics[rmName]
+		if !ok {
+			t.Errorf("found new runtime/metrics metric %s", rmName)
+			_, _, _, ok := internal.RuntimeMetricsToProm(&descs[i])
+			if !ok {
+				t.Errorf("new metric has name that can't be converted, or has an unsupported Kind")
+			}
+			continue
+		}
+		_, ok = goMetricSet[expFQName]
+		if !ok {
+			t.Errorf("existing runtime/metrics metric %s (expected fq name %s) not collected", rmName, expFQName)
+			continue
+		}
+	}
+
+	// Now iterate over the expected metrics and look for removals.
+	cardinality := 0
+	for rmName, fqName := range expectedRuntimeMetrics {
+		if _, ok := rmSet[rmName]; !ok {
+			t.Errorf("runtime/metrics metric %s removed", rmName)
+			continue
+		}
+		if _, ok := goMetricSet[fqName]; !ok {
+			t.Errorf("runtime/metrics metric %s not appearing under expected name %s", rmName, fqName)
+			continue
+		}
+
+		// While we're at it, check to make sure expected cardinality lines
+		// up, but at the point of the protobuf write to get as close to the
+		// real deal as possible.
+		//
+		// Note that we filter out non-runtime/metrics metrics here, because
+		// those are manually managed.
+		var m dto.Metric
+		if err := goMetricSet[fqName].Write(&m); err != nil {
+			t.Errorf("writing metric %s: %v", fqName, err)
+			continue
+		}
+		// N.B. These are the only fields populated by runtime/metrics metrics specifically.
+		// Other fields are populated by e.g. GCStats metrics.
+		switch {
+		case m.Counter != nil:
+			fallthrough
+		case m.Gauge != nil:
+			cardinality++
+		case m.Histogram != nil:
+			cardinality += len(m.Histogram.Bucket) + 3 // + sum, count, and +inf
+		default:
+			t.Errorf("unexpected protobuf structure for metric %s", fqName)
+		}
+	}
+
+	if t.Failed() {
+		t.Log("a new Go version may have been detected, please run")
+		t.Log("\tgo run gen_go_collector_metrics_set.go go1.X")
+		t.Log("where X is the Go version you are currently using")
+	}
+
+	expectCardinality := expectedRuntimeMetricsCardinality
+	if cardinality != expectCardinality {
+		t.Errorf("unexpected cardinality for runtime/metrics metrics: got %d, want %d", cardinality, expectCardinality)
+	}
+}
+
+func TestGoCollectorConcurrency(t *testing.T) {
+	c := NewGoCollector().(*goCollector)
+
+	// Set up multiple goroutines to Collect from the
+	// same GoCollector. In race mode with GOMAXPROCS > 1,
+	// this test should fail often if Collect is not
+	// concurrent-safe.
+	for i := 0; i < 4; i++ {
+		go func() {
+			ch := make(chan Metric)
+			go func() {
+				// Drain all metrics received until the
+				// channel is closed.
+				for range ch {
+				}
+			}()
+			c.Collect(ch)
+			close(ch)
+		}()
+	}
+}

prometheus/go_collector_metrics_go117_test.go

@@ -0,0 +1,41 @@
+// Code generated by gen_go_collector_metrics_set.go; DO NOT EDIT.
+//go:generate go run gen_go_collector_metrics_set.go go1.17
+
+//go:build go1.17 && !go1.18
+// +build go1.17,!go1.18
+
+package prometheus
+
+var expectedRuntimeMetrics = map[string]string{
+	"/gc/cycles/automatic:gc-cycles":              "go_gc_cycles_automatic_gc_cycles_total",
+	"/gc/cycles/forced:gc-cycles":                 "go_gc_cycles_forced_gc_cycles_total",
+	"/gc/cycles/total:gc-cycles":                  "go_gc_cycles_total_gc_cycles_total",
+	"/gc/heap/allocs-by-size:bytes":               "go_gc_heap_allocs_by_size_bytes",
+	"/gc/heap/allocs:bytes":                       "go_gc_heap_allocs_bytes_total",
+	"/gc/heap/allocs:objects":                     "go_gc_heap_allocs_objects_total",
+	"/gc/heap/frees-by-size:bytes":                "go_gc_heap_frees_by_size_bytes",
+	"/gc/heap/frees:bytes":                        "go_gc_heap_frees_bytes_total",
+	"/gc/heap/frees:objects":                      "go_gc_heap_frees_objects_total",
+	"/gc/heap/goal:bytes":                         "go_gc_heap_goal_bytes",
+	"/gc/heap/objects:objects":                    "go_gc_heap_objects_objects",
+	"/gc/heap/tiny/allocs:objects":                "go_gc_heap_tiny_allocs_objects_total",
+	"/gc/pauses:seconds":                          "go_gc_pauses_seconds",
+	"/memory/classes/heap/free:bytes":             "go_memory_classes_heap_free_bytes",
+	"/memory/classes/heap/objects:bytes":          "go_memory_classes_heap_objects_bytes",
+	"/memory/classes/heap/released:bytes":         "go_memory_classes_heap_released_bytes",
+	"/memory/classes/heap/stacks:bytes":           "go_memory_classes_heap_stacks_bytes",
+	"/memory/classes/heap/unused:bytes":           "go_memory_classes_heap_unused_bytes",
+	"/memory/classes/metadata/mcache/free:bytes":  "go_memory_classes_metadata_mcache_free_bytes",
+	"/memory/classes/metadata/mcache/inuse:bytes": "go_memory_classes_metadata_mcache_inuse_bytes",
+	"/memory/classes/metadata/mspan/free:bytes":   "go_memory_classes_metadata_mspan_free_bytes",
+	"/memory/classes/metadata/mspan/inuse:bytes":  "go_memory_classes_metadata_mspan_inuse_bytes",
+	"/memory/classes/metadata/other:bytes":        "go_memory_classes_metadata_other_bytes",
+	"/memory/classes/os-stacks:bytes":             "go_memory_classes_os_stacks_bytes",
+	"/memory/classes/other:bytes":                 "go_memory_classes_other_bytes",
+	"/memory/classes/profiling/buckets:bytes":     "go_memory_classes_profiling_buckets_bytes",
+	"/memory/classes/total:bytes":                 "go_memory_classes_total_bytes",
+	"/sched/goroutines:goroutines":                "go_sched_goroutines_goroutines",
+	"/sched/latencies:seconds":                    "go_sched_latencies_seconds",
+}
+
+const expectedRuntimeMetricsCardinality = 77

prometheus/go_collector_metrics_go118_test.go

@@ -0,0 +1,41 @@
+// Code generated by gen_go_collector_metrics_set.go; DO NOT EDIT.
+//go:generate go run gen_go_collector_metrics_set.go go1.18
+
+//go:build go1.18 && !go1.19
+// +build go1.18,!go1.19
+
+package prometheus
+
+var expectedRuntimeMetrics = map[string]string{
+	"/gc/cycles/automatic:gc-cycles":              "go_gc_cycles_automatic_gc_cycles_total",
+	"/gc/cycles/forced:gc-cycles":                 "go_gc_cycles_forced_gc_cycles_total",
+	"/gc/cycles/total:gc-cycles":                  "go_gc_cycles_total_gc_cycles_total",
+	"/gc/heap/allocs-by-size:bytes":               "go_gc_heap_allocs_by_size_bytes",
+	"/gc/heap/allocs:bytes":                       "go_gc_heap_allocs_bytes_total",
+	"/gc/heap/allocs:objects":                     "go_gc_heap_allocs_objects_total",
+	"/gc/heap/frees-by-size:bytes":                "go_gc_heap_frees_by_size_bytes",
+	"/gc/heap/frees:bytes":                        "go_gc_heap_frees_bytes_total",
+	"/gc/heap/frees:objects":                      "go_gc_heap_frees_objects_total",
+	"/gc/heap/goal:bytes":                         "go_gc_heap_goal_bytes",
+	"/gc/heap/objects:objects":                    "go_gc_heap_objects_objects",
+	"/gc/heap/tiny/allocs:objects":                "go_gc_heap_tiny_allocs_objects_total",
+	"/gc/pauses:seconds":                          "go_gc_pauses_seconds",
+	"/memory/classes/heap/free:bytes":             "go_memory_classes_heap_free_bytes",
+	"/memory/classes/heap/objects:bytes":          "go_memory_classes_heap_objects_bytes",
+	"/memory/classes/heap/released:bytes":         "go_memory_classes_heap_released_bytes",
+	"/memory/classes/heap/stacks:bytes":           "go_memory_classes_heap_stacks_bytes",
+	"/memory/classes/heap/unused:bytes":           "go_memory_classes_heap_unused_bytes",
+	"/memory/classes/metadata/mcache/free:bytes":  "go_memory_classes_metadata_mcache_free_bytes",
+	"/memory/classes/metadata/mcache/inuse:bytes": "go_memory_classes_metadata_mcache_inuse_bytes",
+	"/memory/classes/metadata/mspan/free:bytes":   "go_memory_classes_metadata_mspan_free_bytes",
+	"/memory/classes/metadata/mspan/inuse:bytes":  "go_memory_classes_metadata_mspan_inuse_bytes",
+	"/memory/classes/metadata/other:bytes":        "go_memory_classes_metadata_other_bytes",
+	"/memory/classes/os-stacks:bytes":             "go_memory_classes_os_stacks_bytes",
+	"/memory/classes/other:bytes":                 "go_memory_classes_other_bytes",
+	"/memory/classes/profiling/buckets:bytes":     "go_memory_classes_profiling_buckets_bytes",
+	"/memory/classes/total:bytes":                 "go_memory_classes_total_bytes",
+	"/sched/goroutines:goroutines":                "go_sched_goroutines_goroutines",
+	"/sched/latencies:seconds":                    "go_sched_latencies_seconds",
+}
+
+const expectedRuntimeMetricsCardinality = 77

prometheus/go_collector_metrics_go119_test.go

@@ -0,0 +1,45 @@
+// Code generated by gen_go_collector_metrics_set.go; DO NOT EDIT.
+//go:generate go run gen_go_collector_metrics_set.go go1.19
+
+//go:build go1.19 && !go1.20
+// +build go1.19,!go1.20
+
+package prometheus
+
+var expectedRuntimeMetrics = map[string]string{
+	"/cgo/go-to-c-calls:calls":                    "go_cgo_go_to_c_calls_calls_total",
+	"/gc/cycles/automatic:gc-cycles":              "go_gc_cycles_automatic_gc_cycles_total",
+	"/gc/cycles/forced:gc-cycles":                 "go_gc_cycles_forced_gc_cycles_total",
+	"/gc/cycles/total:gc-cycles":                  "go_gc_cycles_total_gc_cycles_total",
+	"/gc/heap/allocs-by-size:bytes":               "go_gc_heap_allocs_by_size_bytes",
+	"/gc/heap/allocs:bytes":                       "go_gc_heap_allocs_bytes_total",
+	"/gc/heap/allocs:objects":                     "go_gc_heap_allocs_objects_total",
+	"/gc/heap/frees-by-size:bytes":                "go_gc_heap_frees_by_size_bytes",
+	"/gc/heap/frees:bytes":                        "go_gc_heap_frees_bytes_total",
+	"/gc/heap/frees:objects":                      "go_gc_heap_frees_objects_total",
+	"/gc/heap/goal:bytes":                         "go_gc_heap_goal_bytes",
+	"/gc/heap/objects:objects":                    "go_gc_heap_objects_objects",
+	"/gc/heap/tiny/allocs:objects":                "go_gc_heap_tiny_allocs_objects_total",
+	"/gc/limiter/last-enabled:gc-cycle":           "go_gc_limiter_last_enabled_gc_cycle",
+	"/gc/pauses:seconds":                          "go_gc_pauses_seconds",
+	"/gc/stack/starting-size:bytes":               "go_gc_stack_starting_size_bytes",
+	"/memory/classes/heap/free:bytes":             "go_memory_classes_heap_free_bytes",
+	"/memory/classes/heap/objects:bytes":          "go_memory_classes_heap_objects_bytes",
+	"/memory/classes/heap/released:bytes":         "go_memory_classes_heap_released_bytes",
+	"/memory/classes/heap/stacks:bytes":           "go_memory_classes_heap_stacks_bytes",
+	"/memory/classes/heap/unused:bytes":           "go_memory_classes_heap_unused_bytes",
+	"/memory/classes/metadata/mcache/free:bytes":  "go_memory_classes_metadata_mcache_free_bytes",
+	"/memory/classes/metadata/mcache/inuse:bytes": "go_memory_classes_metadata_mcache_inuse_bytes",
+	"/memory/classes/metadata/mspan/free:bytes":   "go_memory_classes_metadata_mspan_free_bytes",
+	"/memory/classes/metadata/mspan/inuse:bytes":  "go_memory_classes_metadata_mspan_inuse_bytes",
+	"/memory/classes/metadata/other:bytes":        "go_memory_classes_metadata_other_bytes",
+	"/memory/classes/os-stacks:bytes":             "go_memory_classes_os_stacks_bytes",
+	"/memory/classes/other:bytes":                 "go_memory_classes_other_bytes",
+	"/memory/classes/profiling/buckets:bytes":     "go_memory_classes_profiling_buckets_bytes",
+	"/memory/classes/total:bytes":                 "go_memory_classes_total_bytes",
+	"/sched/gomaxprocs:threads":                   "go_sched_gomaxprocs_threads",
+	"/sched/goroutines:goroutines":                "go_sched_goroutines_goroutines",
+	"/sched/latencies:seconds":                    "go_sched_latencies_seconds",
+}
+
+const expectedRuntimeMetricsCardinality = 81

prometheus/go_collector_test.go

@@ -155,95 +155,19 @@ func TestGoCollectorGC(t *testing.T) {
 	}
 }
 
-func TestGoCollectorMemStats(t *testing.T) {
-	var (
-		c   = NewGoCollector().(*goCollector)
-		got uint64
-	)
-
-	checkCollect := func(want uint64) {
-		metricCh := make(chan Metric)
-		endCh := make(chan struct{})
+func BenchmarkGoCollector(b *testing.B) {
+	c := NewGoCollector().(*goCollector)
 
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		ch := make(chan Metric, 8)
 		go func() {
-			c.Collect(metricCh)
-			close(endCh)
-		}()
-	Collect:
-		for {
-			select {
-			case metric := <-metricCh:
-				if metric.Desc().fqName != "go_memstats_alloc_bytes" {
-					continue Collect
-				}
-				pb := &dto.Metric{}
-				metric.Write(pb)
-				got = uint64(pb.GetGauge().GetValue())
-			case <-endCh:
-				break Collect
+			// Drain all metrics received until the
+			// channel is closed.
+			for range ch {
 			}
-		}
-		if want != got {
-			t.Errorf("unexpected value of go_memstats_alloc_bytes, want %d, got %d", want, got)
-		}
+		}()
+		c.Collect(ch)
+		close(ch)
 	}
-
-	// Speed up the timing to make the test faster.
-	c.msMaxWait = 5 * time.Millisecond
-	c.msMaxAge = 50 * time.Millisecond
-
-	// Scenario 1: msRead responds slowly, no previous memstats available,
-	// msRead is executed anyway.
-	c.msRead = func(ms *runtime.MemStats) {
-		time.Sleep(20 * time.Millisecond)
-		ms.Alloc = 1
-	}
-	checkCollect(1)
-	// Now msLast is set.
-	c.msMtx.Lock()
-	if want, got := uint64(1), c.msLast.Alloc; want != got {
-		t.Errorf("unexpected of msLast.Alloc, want %d, got %d", want, got)
-	}
-	c.msMtx.Unlock()
-
-	// Scenario 2: msRead responds fast, previous memstats available, new
-	// value collected.
-	c.msRead = func(ms *runtime.MemStats) {
-		ms.Alloc = 2
-	}
-	checkCollect(2)
-	// msLast is set, too.
-	c.msMtx.Lock()
-	if want, got := uint64(2), c.msLast.Alloc; want != got {
-		t.Errorf("unexpected of msLast.Alloc, want %d, got %d", want, got)
-	}
-	c.msMtx.Unlock()
-
-	// Scenario 3: msRead responds slowly, previous memstats available, old
-	// value collected.
-	c.msRead = func(ms *runtime.MemStats) {
-		time.Sleep(20 * time.Millisecond)
-		ms.Alloc = 3
-	}
-	checkCollect(2)
-	// After waiting, new value is still set in msLast.
-	time.Sleep(80 * time.Millisecond)
-	c.msMtx.Lock()
-	if want, got := uint64(3), c.msLast.Alloc; want != got {
-		t.Errorf("unexpected of msLast.Alloc, want %d, got %d", want, got)
-	}
-	c.msMtx.Unlock()
-
-	// Scenario 4: msRead responds slowly, previous memstats is too old, new
-	// value collected.
-	c.msRead = func(ms *runtime.MemStats) {
-		time.Sleep(20 * time.Millisecond)
-		ms.Alloc = 4
-	}
-	checkCollect(4)
-	c.msMtx.Lock()
-	if want, got := uint64(4), c.msLast.Alloc; want != got {
-		t.Errorf("unexpected of msLast.Alloc, want %d, got %d", want, got)
-	}
-	c.msMtx.Unlock()
 }

prometheus/graphite/bridge.go

@@ -30,7 +30,7 @@ import (
 
 	dto "github.com/prometheus/client_model/go"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
 )
 
 const (
@@ -197,14 +197,16 @@ func writeMetrics(w io.Writer, mfs []*dto.MetricFamily, useTags bool, prefix str
 
 	buf := bufio.NewWriter(w)
 	for _, s := range vec {
-		for _, c := range prefix {
-			if _, err := buf.WriteRune(c); err != nil {
+		if prefix != "" {
+			for _, c := range prefix {
+				if _, err := buf.WriteRune(c); err != nil {
+					return err
+				}
+			}
+			if err := buf.WriteByte('.'); err != nil {
 				return err
 			}
 		}
-		if err := buf.WriteByte('.'); err != nil {
-			return err
-		}
 		if err := writeMetric(buf, s.Metric, useTags); err != nil {
 			return err
 		}
@@ -238,9 +240,8 @@ func writeMetric(buf *bufio.Writer, m model.Metric, useTags bool) error {
 		}
 		if useTags {
 			return writeTags(buf, m)
-		} else {
-			return writeLabels(buf, m, numLabels)
 		}
+		return writeLabels(buf, m, numLabels)
 	}
 	return nil
 }

prometheus/graphite/bridge_test.go

@@ -31,7 +31,7 @@ import (
 
 	"github.com/prometheus/common/model"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
 )
 
 func TestSanitize(t *testing.T) {
@@ -101,6 +101,7 @@ func testWriteSummary(t *testing.T, useTags bool) {
 		{prefix: "prefix"},
 		{prefix: "pre/fix"},
 		{prefix: "pre.fix"},
+		{prefix: ""},
 	}
 
 	var (
@@ -141,10 +142,15 @@ func testWriteSummary(t *testing.T, useTags bool) {
 			t.Fatalf("error: %v", err)
 		}
 
-		wantWithPrefix := fmt.Sprintf(want,
-			tc.prefix, tc.prefix, tc.prefix, tc.prefix, tc.prefix,
-			tc.prefix, tc.prefix, tc.prefix, tc.prefix, tc.prefix,
-		)
+		var wantWithPrefix string
+		if tc.prefix == "" {
+			wantWithPrefix = strings.ReplaceAll(want, "%s.", "")
+		} else {
+			wantWithPrefix = fmt.Sprintf(want,
+				tc.prefix, tc.prefix, tc.prefix, tc.prefix, tc.prefix,
+				tc.prefix, tc.prefix, tc.prefix, tc.prefix, tc.prefix,
+			)
+		}
 
 		got := buf.String()
 

prometheus/histogram_test.go

@@ -20,13 +20,16 @@ import (
 	"runtime"
 	"sort"
 	"sync"
+	"sync/atomic"
 	"testing"
 	"testing/quick"
 	"time"
 
 	//nolint:staticcheck // Ignore SA1019. Need to keep deprecated package for compatibility.
 	"github.com/golang/protobuf/proto"
-	"github.com/golang/protobuf/ptypes"
+	"google.golang.org/protobuf/types/known/timestamppb"
+
+	"git.internal/re/client_golang/prometheus/internal"
 
 	dto "github.com/prometheus/client_model/go"
 )
@@ -167,7 +170,7 @@ func TestHistogramConcurrency(t *testing.T) {
 		start.Add(1)
 		end.Add(concLevel)
 
-		sum := NewHistogram(HistogramOpts{
+		his := NewHistogram(HistogramOpts{
 			Name:    "test_histogram",
 			Help:    "helpless",
 			Buckets: testBuckets,
@@ -188,9 +191,9 @@ func TestHistogramConcurrency(t *testing.T) {
 				start.Wait()
 				for _, v := range vals {
 					if n%2 == 0 {
-						sum.Observe(v)
+						his.Observe(v)
 					} else {
-						sum.(ExemplarObserver).ObserveWithExemplar(v, Labels{"foo": "bar"})
+						his.(ExemplarObserver).ObserveWithExemplar(v, Labels{"foo": "bar"})
 					}
 				}
 				end.Done()
@@ -201,7 +204,7 @@ func TestHistogramConcurrency(t *testing.T) {
 		end.Wait()
 
 		m := &dto.Metric{}
-		sum.Write(m)
+		his.Write(m)
 		if got, want := int(*m.Histogram.SampleCount), total; got != want {
 			t.Errorf("got sample count %d, want %d", got, want)
 		}
@@ -352,6 +355,16 @@ func TestBuckets(t *testing.T) {
 	if !reflect.DeepEqual(got, want) {
 		t.Errorf("exponential buckets: got %v, want %v", got, want)
 	}
+
+	got = ExponentialBucketsRange(1, 100, 10)
+	want = []float64{
+		1.0, 1.6681, 2.7825, 4.6415, 7.7426, 12.9154, 21.5443,
+		35.9381, 59.9484, 100.0000,
+	}
+	const epsilon = 0.0001
+	if !internal.AlmostEqualFloat64s(got, want, epsilon) {
+		t.Errorf("exponential buckets range: got %v, want %v (epsilon %f)", got, want, epsilon)
+	}
 }
 
 func TestHistogramAtomicObserve(t *testing.T) {
@@ -408,30 +421,30 @@ func TestHistogramExemplar(t *testing.T) {
 	}).(*histogram)
 	histogram.now = func() time.Time { return now }
 
-	ts, err := ptypes.TimestampProto(now)
-	if err != nil {
+	ts := timestamppb.New(now)
+	if err := ts.CheckValid(); err != nil {
 		t.Fatal(err)
 	}
 	expectedExemplars := []*dto.Exemplar{
 		nil,
-		&dto.Exemplar{
+		{
 			Label: []*dto.LabelPair{
-				&dto.LabelPair{Name: proto.String("id"), Value: proto.String("2")},
+				{Name: proto.String("id"), Value: proto.String("2")},
 			},
 			Value:     proto.Float64(1.6),
 			Timestamp: ts,
 		},
 		nil,
-		&dto.Exemplar{
+		{
 			Label: []*dto.LabelPair{
-				&dto.LabelPair{Name: proto.String("id"), Value: proto.String("3")},
+				{Name: proto.String("id"), Value: proto.String("3")},
 			},
 			Value:     proto.Float64(4),
 			Timestamp: ts,
 		},
-		&dto.Exemplar{
+		{
 			Label: []*dto.LabelPair{
-				&dto.LabelPair{Name: proto.String("id"), Value: proto.String("4")},
+				{Name: proto.String("id"), Value: proto.String("4")},
 			},
 			Value:     proto.Float64(4.5),
 			Timestamp: ts,
@@ -456,3 +469,408 @@ func TestHistogramExemplar(t *testing.T) {
 		}
 	}
 }
+
+func TestNativeHistogram(t *testing.T) {
+	scenarios := []struct {
+		name             string
+		observations     []float64 // With simulated interval of 1m.
+		factor           float64
+		zeroThreshold    float64
+		maxBuckets       uint32
+		minResetDuration time.Duration
+		maxZeroThreshold float64
+		want             string // String representation of protobuf.
+	}{
+		{
+			name:         "no sparse buckets",
+			observations: []float64{1, 2, 3},
+			factor:       1,
+			want:         `sample_count:3 sample_sum:6 bucket:<cumulative_count:0 upper_bound:0.005 > bucket:<cumulative_count:0 upper_bound:0.01 > bucket:<cumulative_count:0 upper_bound:0.025 > bucket:<cumulative_count:0 upper_bound:0.05 > bucket:<cumulative_count:0 upper_bound:0.1 > bucket:<cumulative_count:0 upper_bound:0.25 > bucket:<cumulative_count:0 upper_bound:0.5 > bucket:<cumulative_count:1 upper_bound:1 > bucket:<cumulative_count:2 upper_bound:2.5 > bucket:<cumulative_count:3 upper_bound:5 > bucket:<cumulative_count:3 upper_bound:10 > `, // Has conventional buckets because there are no sparse buckets.
+		},
+		{
+			name:         "factor 1.1 results in schema 3",
+			observations: []float64{0, 1, 2, 3},
+			factor:       1.1,
+			want:         `sample_count:4 sample_sum:6 schema:3 zero_threshold:2.938735877055719e-39 zero_count:1 positive_span:<offset:0 length:1 > positive_span:<offset:7 length:1 > positive_span:<offset:4 length:1 > positive_delta:1 positive_delta:0 positive_delta:0 `,
+		},
+		{
+			name:         "factor 1.2 results in schema 2",
+			observations: []float64{0, 1, 1.2, 1.4, 1.8, 2},
+			factor:       1.2,
+			want:         `sample_count:6 sample_sum:7.4 schema:2 zero_threshold:2.938735877055719e-39 zero_count:1 positive_span:<offset:0 length:5 > positive_delta:1 positive_delta:-1 positive_delta:2 positive_delta:-2 positive_delta:2 `,
+		},
+		{
+			name: "factor 4 results in schema -1",
+			observations: []float64{
+				0.5, 1, // Bucket 0: (0.25, 1]
+				1.5, 2, 3, 3.5, // Bucket 1: (1, 4]
+				5, 6, 7, // Bucket 2: (4, 16]
+				33.33, // Bucket 3: (16, 64]
+			},
+			factor: 4,
+			want:   `sample_count:10 sample_sum:62.83 schema:-1 zero_threshold:2.938735877055719e-39 zero_count:0 positive_span:<offset:0 length:4 > positive_delta:2 positive_delta:2 positive_delta:-1 positive_delta:-2 `,
+		},
+		{
+			name: "factor 17 results in schema -2",
+			observations: []float64{
+				0.5, 1, // Bucket 0: (0.0625, 1]
+				1.5, 2, 3, 3.5, 5, 6, 7, // Bucket 1: (1, 16]
+				33.33, // Bucket 2: (16, 256]
+			},
+			factor: 17,
+			want:   `sample_count:10 sample_sum:62.83 schema:-2 zero_threshold:2.938735877055719e-39 zero_count:0 positive_span:<offset:0 length:3 > positive_delta:2 positive_delta:5 positive_delta:-6 `,
+		},
+		{
+			name:         "negative buckets",
+			observations: []float64{0, -1, -1.2, -1.4, -1.8, -2},
+			factor:       1.2,
+			want:         `sample_count:6 sample_sum:-7.4 schema:2 zero_threshold:2.938735877055719e-39 zero_count:1 negative_span:<offset:0 length:5 > negative_delta:1 negative_delta:-1 negative_delta:2 negative_delta:-2 negative_delta:2 `,
+		},
+		{
+			name:         "negative and positive buckets",
+			observations: []float64{0, -1, -1.2, -1.4, -1.8, -2, 1, 1.2, 1.4, 1.8, 2},
+			factor:       1.2,
+			want:         `sample_count:11 sample_sum:0 schema:2 zero_threshold:2.938735877055719e-39 zero_count:1 negative_span:<offset:0 length:5 > negative_delta:1 negative_delta:-1 negative_delta:2 negative_delta:-2 negative_delta:2 positive_span:<offset:0 length:5 > positive_delta:1 positive_delta:-1 positive_delta:2 positive_delta:-2 positive_delta:2 `,
+		},
+		{
+			name:          "wide zero bucket",
+			observations:  []float64{0, -1, -1.2, -1.4, -1.8, -2, 1, 1.2, 1.4, 1.8, 2},
+			factor:        1.2,
+			zeroThreshold: 1.4,
+			want:          `sample_count:11 sample_sum:0 schema:2 zero_threshold:1.4 zero_count:7 negative_span:<offset:4 length:1 > negative_delta:2 positive_span:<offset:4 length:1 > positive_delta:2 `,
+		},
+		{
+			name:         "NaN observation",
+			observations: []float64{0, 1, 1.2, 1.4, 1.8, 2, math.NaN()},
+			factor:       1.2,
+			want:         `sample_count:7 sample_sum:nan schema:2 zero_threshold:2.938735877055719e-39 zero_count:1 positive_span:<offset:0 length:5 > positive_delta:1 positive_delta:-1 positive_delta:2 positive_delta:-2 positive_delta:2 `,
+		},
+		{
+			name:         "+Inf observation",
+			observations: []float64{0, 1, 1.2, 1.4, 1.8, 2, math.Inf(+1)},
+			factor:       1.2,
+			want:         `sample_count:7 sample_sum:inf schema:2 zero_threshold:2.938735877055719e-39 zero_count:1 positive_span:<offset:0 length:5 > positive_span:<offset:4092 length:1 > positive_delta:1 positive_delta:-1 positive_delta:2 positive_delta:-2 positive_delta:2 positive_delta:-1 `,
+		},
+		{
+			name:         "-Inf observation",
+			observations: []float64{0, 1, 1.2, 1.4, 1.8, 2, math.Inf(-1)},
+			factor:       1.2,
+			want:         `sample_count:7 sample_sum:-inf schema:2 zero_threshold:2.938735877055719e-39 zero_count:1 negative_span:<offset:4097 length:1 > negative_delta:1 positive_span:<offset:0 length:5 > positive_delta:1 positive_delta:-1 positive_delta:2 positive_delta:-2 positive_delta:2 `,
+		},
+		{
+			name:         "limited buckets but nothing triggered",
+			observations: []float64{0, 1, 1.2, 1.4, 1.8, 2},
+			factor:       1.2,
+			maxBuckets:   4,
+			want:         `sample_count:6 sample_sum:7.4 schema:2 zero_threshold:2.938735877055719e-39 zero_count:1 positive_span:<offset:0 length:5 > positive_delta:1 positive_delta:-1 positive_delta:2 positive_delta:-2 positive_delta:2 `,
+		},
+		{
+			name:         "buckets limited by halving resolution",
+			observations: []float64{0, 1, 1.1, 1.2, 1.4, 1.8, 2, 3},
+			factor:       1.2,
+			maxBuckets:   4,
+			want:         `sample_count:8 sample_sum:11.5 schema:1 zero_threshold:2.938735877055719e-39 zero_count:1 positive_span:<offset:0 length:5 > positive_delta:1 positive_delta:2 positive_delta:-1 positive_delta:-2 positive_delta:1 `,
+		},
+		{
+			name:             "buckets limited by widening the zero bucket",
+			observations:     []float64{0, 1, 1.1, 1.2, 1.4, 1.8, 2, 3},
+			factor:           1.2,
+			maxBuckets:       4,
+			maxZeroThreshold: 1.2,
+			want:             `sample_count:8 sample_sum:11.5 schema:2 zero_threshold:1 zero_count:2 positive_span:<offset:1 length:7 > positive_delta:1 positive_delta:1 positive_delta:-2 positive_delta:2 positive_delta:-2 positive_delta:0 positive_delta:1 `,
+		},
+		{
+			name:             "buckets limited by widening the zero bucket twice",
+			observations:     []float64{0, 1, 1.1, 1.2, 1.4, 1.8, 2, 3, 4},
+			factor:           1.2,
+			maxBuckets:       4,
+			maxZeroThreshold: 1.2,
+			want:             `sample_count:9 sample_sum:15.5 schema:2 zero_threshold:1.189207115002721 zero_count:3 positive_span:<offset:2 length:7 > positive_delta:2 positive_delta:-2 positive_delta:2 positive_delta:-2 positive_delta:0 positive_delta:1 positive_delta:0 `,
+		},
+		{
+			name:             "buckets limited by reset",
+			observations:     []float64{0, 1, 1.1, 1.2, 1.4, 1.8, 2, 3, 4},
+			factor:           1.2,
+			maxBuckets:       4,
+			maxZeroThreshold: 1.2,
+			minResetDuration: 5 * time.Minute,
+			want:             `sample_count:2 sample_sum:7 schema:2 zero_threshold:2.938735877055719e-39 zero_count:0 positive_span:<offset:7 length:2 > positive_delta:1 positive_delta:0 `,
+		},
+		{
+			name:         "limited buckets but nothing triggered, negative observations",
+			observations: []float64{0, -1, -1.2, -1.4, -1.8, -2},
+			factor:       1.2,
+			maxBuckets:   4,
+			want:         `sample_count:6 sample_sum:-7.4 schema:2 zero_threshold:2.938735877055719e-39 zero_count:1 negative_span:<offset:0 length:5 > negative_delta:1 negative_delta:-1 negative_delta:2 negative_delta:-2 negative_delta:2 `,
+		},
+		{
+			name:         "buckets limited by halving resolution, negative observations",
+			observations: []float64{0, -1, -1.1, -1.2, -1.4, -1.8, -2, -3},
+			factor:       1.2,
+			maxBuckets:   4,
+			want:         `sample_count:8 sample_sum:-11.5 schema:1 zero_threshold:2.938735877055719e-39 zero_count:1 negative_span:<offset:0 length:5 > negative_delta:1 negative_delta:2 negative_delta:-1 negative_delta:-2 negative_delta:1 `,
+		},
+		{
+			name:             "buckets limited by widening the zero bucket, negative observations",
+			observations:     []float64{0, -1, -1.1, -1.2, -1.4, -1.8, -2, -3},
+			factor:           1.2,
+			maxBuckets:       4,
+			maxZeroThreshold: 1.2,
+			want:             `sample_count:8 sample_sum:-11.5 schema:2 zero_threshold:1 zero_count:2 negative_span:<offset:1 length:7 > negative_delta:1 negative_delta:1 negative_delta:-2 negative_delta:2 negative_delta:-2 negative_delta:0 negative_delta:1 `,
+		},
+		{
+			name:             "buckets limited by widening the zero bucket twice, negative observations",
+			observations:     []float64{0, -1, -1.1, -1.2, -1.4, -1.8, -2, -3, -4},
+			factor:           1.2,
+			maxBuckets:       4,
+			maxZeroThreshold: 1.2,
+			want:             `sample_count:9 sample_sum:-15.5 schema:2 zero_threshold:1.189207115002721 zero_count:3 negative_span:<offset:2 length:7 > negative_delta:2 negative_delta:-2 negative_delta:2 negative_delta:-2 negative_delta:0 negative_delta:1 negative_delta:0 `,
+		},
+		{
+			name:             "buckets limited by reset, negative observations",
+			observations:     []float64{0, -1, -1.1, -1.2, -1.4, -1.8, -2, -3, -4},
+			factor:           1.2,
+			maxBuckets:       4,
+			maxZeroThreshold: 1.2,
+			minResetDuration: 5 * time.Minute,
+			want:             `sample_count:2 sample_sum:-7 schema:2 zero_threshold:2.938735877055719e-39 zero_count:0 negative_span:<offset:7 length:2 > negative_delta:1 negative_delta:0 `,
+		},
+		{
+			name:             "buckets limited by halving resolution, then reset",
+			observations:     []float64{0, 1, 1.1, 1.2, 1.4, 1.8, 2, 5, 5.1, 3, 4},
+			factor:           1.2,
+			maxBuckets:       4,
+			minResetDuration: 9 * time.Minute,
+			want:             `sample_count:2 sample_sum:7 schema:2 zero_threshold:2.938735877055719e-39 zero_count:0 positive_span:<offset:7 length:2 > positive_delta:1 positive_delta:0 `,
+		},
+		{
+			name:             "buckets limited by widening the zero bucket, then reset",
+			observations:     []float64{0, 1, 1.1, 1.2, 1.4, 1.8, 2, 5, 5.1, 3, 4},
+			factor:           1.2,
+			maxBuckets:       4,
+			maxZeroThreshold: 1.2,
+			minResetDuration: 9 * time.Minute,
+			want:             `sample_count:2 sample_sum:7 schema:2 zero_threshold:2.938735877055719e-39 zero_count:0 positive_span:<offset:7 length:2 > positive_delta:1 positive_delta:0 `,
+		},
+	}
+
+	for _, s := range scenarios {
+		t.Run(s.name, func(t *testing.T) {
+			his := NewHistogram(HistogramOpts{
+				Name:                            "name",
+				Help:                            "help",
+				NativeHistogramBucketFactor:     s.factor,
+				NativeHistogramZeroThreshold:    s.zeroThreshold,
+				NativeHistogramMaxBucketNumber:  s.maxBuckets,
+				NativeHistogramMinResetDuration: s.minResetDuration,
+				NativeHistogramMaxZeroThreshold: s.maxZeroThreshold,
+			})
+			ts := time.Now().Add(30 * time.Second)
+			now := func() time.Time {
+				return ts
+			}
+			his.(*histogram).now = now
+			for _, o := range s.observations {
+				his.Observe(o)
+				ts = ts.Add(time.Minute)
+			}
+			m := &dto.Metric{}
+			if err := his.Write(m); err != nil {
+				t.Fatal("unexpected error writing metric", err)
+			}
+			got := m.Histogram.String()
+			if s.want != got {
+				t.Errorf("want histogram %q, got %q", s.want, got)
+			}
+		})
+	}
+}
+
+func TestNativeHistogramConcurrency(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping test in short mode.")
+	}
+
+	rand.Seed(42)
+
+	it := func(n uint32) bool {
+		mutations := int(n%1e4 + 1e4)
+		concLevel := int(n%5 + 1)
+		total := mutations * concLevel
+
+		var start, end sync.WaitGroup
+		start.Add(1)
+		end.Add(concLevel)
+
+		his := NewHistogram(HistogramOpts{
+			Name:                            "test_native_histogram",
+			Help:                            "This help is sparse.",
+			NativeHistogramBucketFactor:     1.05,
+			NativeHistogramZeroThreshold:    0.0000001,
+			NativeHistogramMaxBucketNumber:  50,
+			NativeHistogramMinResetDuration: time.Hour, // Comment out to test for totals below.
+			NativeHistogramMaxZeroThreshold: 0.001,
+		})
+
+		ts := time.Now().Add(30 * time.Second).Unix()
+		now := func() time.Time {
+			return time.Unix(atomic.LoadInt64(&ts), 0)
+		}
+		his.(*histogram).now = now
+
+		allVars := make([]float64, total)
+		var sampleSum float64
+		for i := 0; i < concLevel; i++ {
+			vals := make([]float64, mutations)
+			for j := 0; j < mutations; j++ {
+				v := rand.NormFloat64()
+				vals[j] = v
+				allVars[i*mutations+j] = v
+				sampleSum += v
+			}
+
+			go func(vals []float64) {
+				start.Wait()
+				for _, v := range vals {
+					// An observation every 1 to 10 seconds.
+					atomic.AddInt64(&ts, rand.Int63n(10)+1)
+					his.Observe(v)
+				}
+				end.Done()
+			}(vals)
+		}
+		sort.Float64s(allVars)
+		start.Done()
+		end.Wait()
+
+		m := &dto.Metric{}
+		his.Write(m)
+
+		// Uncomment these tests for totals only if you have disabled histogram resets above.
+		//
+		// if got, want := int(*m.Histogram.SampleCount), total; got != want {
+		// 	t.Errorf("got sample count %d, want %d", got, want)
+		// }
+		// if got, want := *m.Histogram.SampleSum, sampleSum; math.Abs((got-want)/want) > 0.001 {
+		// 	t.Errorf("got sample sum %f, want %f", got, want)
+		// }
+
+		sumBuckets := int(m.Histogram.GetZeroCount())
+		current := 0
+		for _, delta := range m.Histogram.GetNegativeDelta() {
+			current += int(delta)
+			if current < 0 {
+				t.Fatalf("negative bucket population negative: %d", current)
+			}
+			sumBuckets += current
+		}
+		current = 0
+		for _, delta := range m.Histogram.GetPositiveDelta() {
+			current += int(delta)
+			if current < 0 {
+				t.Fatalf("positive bucket population negative: %d", current)
+			}
+			sumBuckets += current
+		}
+		if got, want := sumBuckets, int(*m.Histogram.SampleCount); got != want {
+			t.Errorf("got bucket population sum %d, want %d", got, want)
+		}
+
+		return true
+	}
+
+	if err := quick.Check(it, nil); err != nil {
+		t.Error(err)
+	}
+}
+
+func TestGetLe(t *testing.T) {
+	scenarios := []struct {
+		key    int
+		schema int32
+		want   float64
+	}{
+		{
+			key:    -1,
+			schema: -1,
+			want:   0.25,
+		},
+		{
+			key:    0,
+			schema: -1,
+			want:   1,
+		},
+		{
+			key:    1,
+			schema: -1,
+			want:   4,
+		},
+		{
+			key:    512,
+			schema: -1,
+			want:   math.MaxFloat64,
+		},
+		{
+			key:    513,
+			schema: -1,
+			want:   math.Inf(+1),
+		},
+		{
+			key:    -1,
+			schema: 0,
+			want:   0.5,
+		},
+		{
+			key:    0,
+			schema: 0,
+			want:   1,
+		},
+		{
+			key:    1,
+			schema: 0,
+			want:   2,
+		},
+		{
+			key:    1024,
+			schema: 0,
+			want:   math.MaxFloat64,
+		},
+		{
+			key:    1025,
+			schema: 0,
+			want:   math.Inf(+1),
+		},
+		{
+			key:    -1,
+			schema: 2,
+			want:   0.8408964152537144,
+		},
+		{
+			key:    0,
+			schema: 2,
+			want:   1,
+		},
+		{
+			key:    1,
+			schema: 2,
+			want:   1.189207115002721,
+		},
+		{
+			key:    4096,
+			schema: 2,
+			want:   math.MaxFloat64,
+		},
+		{
+			key:    4097,
+			schema: 2,
+			want:   math.Inf(+1),
+		},
+	}
+
+	for i, s := range scenarios {
+		got := getLe(s.key, s.schema)
+		if s.want != got {
+			t.Errorf("%d. key %d, schema %d, want upper bound of %g, got %g", i, s.key, s.schema, s.want, got)
+		}
+	}
+}

prometheus/internal/almost_equal.go

@@ -0,0 +1,60 @@
+// Copyright (c) 2015 Björn Rabenstein
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+// The code in this package is copy/paste to avoid a dependency. Hence this file
+// carries the copyright of the original repo.
+// https://github.com/beorn7/floats
+package internal
+
+import (
+	"math"
+)
+
+// minNormalFloat64 is the smallest positive normal value of type float64.
+var minNormalFloat64 = math.Float64frombits(0x0010000000000000)
+
+// AlmostEqualFloat64 returns true if a and b are equal within a relative error
+// of epsilon. See http://floating-point-gui.de/errors/comparison/ for the
+// details of the applied method.
+func AlmostEqualFloat64(a, b, epsilon float64) bool {
+	if a == b {
+		return true
+	}
+	absA := math.Abs(a)
+	absB := math.Abs(b)
+	diff := math.Abs(a - b)
+	if a == 0 || b == 0 || absA+absB < minNormalFloat64 {
+		return diff < epsilon*minNormalFloat64
+	}
+	return diff/math.Min(absA+absB, math.MaxFloat64) < epsilon
+}
+
+// AlmostEqualFloat64s is the slice form of AlmostEqualFloat64.
+func AlmostEqualFloat64s(a, b []float64, epsilon float64) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i := range a {
+		if !AlmostEqualFloat64(a[i], b[i], epsilon) {
+			return false
+		}
+	}
+	return true
+}

prometheus/internal/difflib.go

@@ -0,0 +1,654 @@
+// Copyright 2022 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// It provides tools to compare sequences of strings and generate textual diffs.
+//
+// Maintaining `GetUnifiedDiffString` here because original repository
+// (https://github.com/pmezard/go-difflib) is no loger maintained.
+package internal
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"strings"
+)
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+func max(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+func calculateRatio(matches, length int) float64 {
+	if length > 0 {
+		return 2.0 * float64(matches) / float64(length)
+	}
+	return 1.0
+}
+
+type Match struct {
+	A    int
+	B    int
+	Size int
+}
+
+type OpCode struct {
+	Tag byte
+	I1  int
+	I2  int
+	J1  int
+	J2  int
+}
+
+// SequenceMatcher compares sequence of strings. The basic
+// algorithm predates, and is a little fancier than, an algorithm
+// published in the late 1980's by Ratcliff and Obershelp under the
+// hyperbolic name "gestalt pattern matching".  The basic idea is to find
+// the longest contiguous matching subsequence that contains no "junk"
+// elements (R-O doesn't address junk).  The same idea is then applied
+// recursively to the pieces of the sequences to the left and to the right
+// of the matching subsequence.  This does not yield minimal edit
+// sequences, but does tend to yield matches that "look right" to people.
+//
+// SequenceMatcher tries to compute a "human-friendly diff" between two
+// sequences.  Unlike e.g. UNIX(tm) diff, the fundamental notion is the
+// longest *contiguous* & junk-free matching subsequence.  That's what
+// catches peoples' eyes.  The Windows(tm) windiff has another interesting
+// notion, pairing up elements that appear uniquely in each sequence.
+// That, and the method here, appear to yield more intuitive difference
+// reports than does diff.  This method appears to be the least vulnerable
+// to synching up on blocks of "junk lines", though (like blank lines in
+// ordinary text files, or maybe "<P>" lines in HTML files).  That may be
+// because this is the only method of the 3 that has a *concept* of
+// "junk" <wink>.
+//
+// Timing:  Basic R-O is cubic time worst case and quadratic time expected
+// case.  SequenceMatcher is quadratic time for the worst case and has
+// expected-case behavior dependent in a complicated way on how many
+// elements the sequences have in common; best case time is linear.
+type SequenceMatcher struct {
+	a              []string
+	b              []string
+	b2j            map[string][]int
+	IsJunk         func(string) bool
+	autoJunk       bool
+	bJunk          map[string]struct{}
+	matchingBlocks []Match
+	fullBCount     map[string]int
+	bPopular       map[string]struct{}
+	opCodes        []OpCode
+}
+
+func NewMatcher(a, b []string) *SequenceMatcher {
+	m := SequenceMatcher{autoJunk: true}
+	m.SetSeqs(a, b)
+	return &m
+}
+
+func NewMatcherWithJunk(a, b []string, autoJunk bool,
+	isJunk func(string) bool,
+) *SequenceMatcher {
+	m := SequenceMatcher{IsJunk: isJunk, autoJunk: autoJunk}
+	m.SetSeqs(a, b)
+	return &m
+}
+
+// Set two sequences to be compared.
+func (m *SequenceMatcher) SetSeqs(a, b []string) {
+	m.SetSeq1(a)
+	m.SetSeq2(b)
+}
+
+// Set the first sequence to be compared. The second sequence to be compared is
+// not changed.
+//
+// SequenceMatcher computes and caches detailed information about the second
+// sequence, so if you want to compare one sequence S against many sequences,
+// use .SetSeq2(s) once and call .SetSeq1(x) repeatedly for each of the other
+// sequences.
+//
+// See also SetSeqs() and SetSeq2().
+func (m *SequenceMatcher) SetSeq1(a []string) {
+	if &a == &m.a {
+		return
+	}
+	m.a = a
+	m.matchingBlocks = nil
+	m.opCodes = nil
+}
+
+// Set the second sequence to be compared. The first sequence to be compared is
+// not changed.
+func (m *SequenceMatcher) SetSeq2(b []string) {
+	if &b == &m.b {
+		return
+	}
+	m.b = b
+	m.matchingBlocks = nil
+	m.opCodes = nil
+	m.fullBCount = nil
+	m.chainB()
+}
+
+func (m *SequenceMatcher) chainB() {
+	// Populate line -> index mapping
+	b2j := map[string][]int{}
+	for i, s := range m.b {
+		indices := b2j[s]
+		indices = append(indices, i)
+		b2j[s] = indices
+	}
+
+	// Purge junk elements
+	m.bJunk = map[string]struct{}{}
+	if m.IsJunk != nil {
+		junk := m.bJunk
+		for s := range b2j {
+			if m.IsJunk(s) {
+				junk[s] = struct{}{}
+			}
+		}
+		for s := range junk {
+			delete(b2j, s)
+		}
+	}
+
+	// Purge remaining popular elements
+	popular := map[string]struct{}{}
+	n := len(m.b)
+	if m.autoJunk && n >= 200 {
+		ntest := n/100 + 1
+		for s, indices := range b2j {
+			if len(indices) > ntest {
+				popular[s] = struct{}{}
+			}
+		}
+		for s := range popular {
+			delete(b2j, s)
+		}
+	}
+	m.bPopular = popular
+	m.b2j = b2j
+}
+
+func (m *SequenceMatcher) isBJunk(s string) bool {
+	_, ok := m.bJunk[s]
+	return ok
+}
+
+// Find longest matching block in a[alo:ahi] and b[blo:bhi].
+//
+// If IsJunk is not defined:
+//
+// Return (i,j,k) such that a[i:i+k] is equal to b[j:j+k], where
+//
+//	alo <= i <= i+k <= ahi
+//	blo <= j <= j+k <= bhi
+//
+// and for all (i',j',k') meeting those conditions,
+//
+//	k >= k'
+//	i <= i'
+//	and if i == i', j <= j'
+//
+// In other words, of all maximal matching blocks, return one that
+// starts earliest in a, and of all those maximal matching blocks that
+// start earliest in a, return the one that starts earliest in b.
+//
+// If IsJunk is defined, first the longest matching block is
+// determined as above, but with the additional restriction that no
+// junk element appears in the block.  Then that block is extended as
+// far as possible by matching (only) junk elements on both sides.  So
+// the resulting block never matches on junk except as identical junk
+// happens to be adjacent to an "interesting" match.
+//
+// If no blocks match, return (alo, blo, 0).
+func (m *SequenceMatcher) findLongestMatch(alo, ahi, blo, bhi int) Match {
+	// CAUTION:  stripping common prefix or suffix would be incorrect.
+	// E.g.,
+	//    ab
+	//    acab
+	// Longest matching block is "ab", but if common prefix is
+	// stripped, it's "a" (tied with "b").  UNIX(tm) diff does so
+	// strip, so ends up claiming that ab is changed to acab by
+	// inserting "ca" in the middle.  That's minimal but unintuitive:
+	// "it's obvious" that someone inserted "ac" at the front.
+	// Windiff ends up at the same place as diff, but by pairing up
+	// the unique 'b's and then matching the first two 'a's.
+	besti, bestj, bestsize := alo, blo, 0
+
+	// find longest junk-free match
+	// during an iteration of the loop, j2len[j] = length of longest
+	// junk-free match ending with a[i-1] and b[j]
+	j2len := map[int]int{}
+	for i := alo; i != ahi; i++ {
+		// look at all instances of a[i] in b; note that because
+		// b2j has no junk keys, the loop is skipped if a[i] is junk
+		newj2len := map[int]int{}
+		for _, j := range m.b2j[m.a[i]] {
+			// a[i] matches b[j]
+			if j < blo {
+				continue
+			}
+			if j >= bhi {
+				break
+			}
+			k := j2len[j-1] + 1
+			newj2len[j] = k
+			if k > bestsize {
+				besti, bestj, bestsize = i-k+1, j-k+1, k
+			}
+		}
+		j2len = newj2len
+	}
+
+	// Extend the best by non-junk elements on each end.  In particular,
+	// "popular" non-junk elements aren't in b2j, which greatly speeds
+	// the inner loop above, but also means "the best" match so far
+	// doesn't contain any junk *or* popular non-junk elements.
+	for besti > alo && bestj > blo && !m.isBJunk(m.b[bestj-1]) &&
+		m.a[besti-1] == m.b[bestj-1] {
+		besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
+	}
+	for besti+bestsize < ahi && bestj+bestsize < bhi &&
+		!m.isBJunk(m.b[bestj+bestsize]) &&
+		m.a[besti+bestsize] == m.b[bestj+bestsize] {
+		bestsize++
+	}
+
+	// Now that we have a wholly interesting match (albeit possibly
+	// empty!), we may as well suck up the matching junk on each
+	// side of it too.  Can't think of a good reason not to, and it
+	// saves post-processing the (possibly considerable) expense of
+	// figuring out what to do with it.  In the case of an empty
+	// interesting match, this is clearly the right thing to do,
+	// because no other kind of match is possible in the regions.
+	for besti > alo && bestj > blo && m.isBJunk(m.b[bestj-1]) &&
+		m.a[besti-1] == m.b[bestj-1] {
+		besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
+	}
+	for besti+bestsize < ahi && bestj+bestsize < bhi &&
+		m.isBJunk(m.b[bestj+bestsize]) &&
+		m.a[besti+bestsize] == m.b[bestj+bestsize] {
+		bestsize++
+	}
+
+	return Match{A: besti, B: bestj, Size: bestsize}
+}
+
+// Return list of triples describing matching subsequences.
+//
+// Each triple is of the form (i, j, n), and means that
+// a[i:i+n] == b[j:j+n].  The triples are monotonically increasing in
+// i and in j. It's also guaranteed that if (i, j, n) and (i', j', n') are
+// adjacent triples in the list, and the second is not the last triple in the
+// list, then i+n != i' or j+n != j'. IOW, adjacent triples never describe
+// adjacent equal blocks.
+//
+// The last triple is a dummy, (len(a), len(b), 0), and is the only
+// triple with n==0.
+func (m *SequenceMatcher) GetMatchingBlocks() []Match {
+	if m.matchingBlocks != nil {
+		return m.matchingBlocks
+	}
+
+	var matchBlocks func(alo, ahi, blo, bhi int, matched []Match) []Match
+	matchBlocks = func(alo, ahi, blo, bhi int, matched []Match) []Match {
+		match := m.findLongestMatch(alo, ahi, blo, bhi)
+		i, j, k := match.A, match.B, match.Size
+		if match.Size > 0 {
+			if alo < i && blo < j {
+				matched = matchBlocks(alo, i, blo, j, matched)
+			}
+			matched = append(matched, match)
+			if i+k < ahi && j+k < bhi {
+				matched = matchBlocks(i+k, ahi, j+k, bhi, matched)
+			}
+		}
+		return matched
+	}
+	matched := matchBlocks(0, len(m.a), 0, len(m.b), nil)
+
+	// It's possible that we have adjacent equal blocks in the
+	// matching_blocks list now.
+	nonAdjacent := []Match{}
+	i1, j1, k1 := 0, 0, 0
+	for _, b := range matched {
+		// Is this block adjacent to i1, j1, k1?
+		i2, j2, k2 := b.A, b.B, b.Size
+		if i1+k1 == i2 && j1+k1 == j2 {
+			// Yes, so collapse them -- this just increases the length of
+			// the first block by the length of the second, and the first
+			// block so lengthened remains the block to compare against.
+			k1 += k2
+		} else {
+			// Not adjacent.  Remember the first block (k1==0 means it's
+			// the dummy we started with), and make the second block the
+			// new block to compare against.
+			if k1 > 0 {
+				nonAdjacent = append(nonAdjacent, Match{i1, j1, k1})
+			}
+			i1, j1, k1 = i2, j2, k2
+		}
+	}
+	if k1 > 0 {
+		nonAdjacent = append(nonAdjacent, Match{i1, j1, k1})
+	}
+
+	nonAdjacent = append(nonAdjacent, Match{len(m.a), len(m.b), 0})
+	m.matchingBlocks = nonAdjacent
+	return m.matchingBlocks
+}
+
+// Return list of 5-tuples describing how to turn a into b.
+//
+// Each tuple is of the form (tag, i1, i2, j1, j2).  The first tuple
+// has i1 == j1 == 0, and remaining tuples have i1 == the i2 from the
+// tuple preceding it, and likewise for j1 == the previous j2.
+//
+// The tags are characters, with these meanings:
+//
+// 'r' (replace):  a[i1:i2] should be replaced by b[j1:j2]
+//
+// 'd' (delete):   a[i1:i2] should be deleted, j1==j2 in this case.
+//
+// 'i' (insert):   b[j1:j2] should be inserted at a[i1:i1], i1==i2 in this case.
+//
+// 'e' (equal):    a[i1:i2] == b[j1:j2]
+func (m *SequenceMatcher) GetOpCodes() []OpCode {
+	if m.opCodes != nil {
+		return m.opCodes
+	}
+	i, j := 0, 0
+	matching := m.GetMatchingBlocks()
+	opCodes := make([]OpCode, 0, len(matching))
+	for _, m := range matching {
+		//  invariant:  we've pumped out correct diffs to change
+		//  a[:i] into b[:j], and the next matching block is
+		//  a[ai:ai+size] == b[bj:bj+size]. So we need to pump
+		//  out a diff to change a[i:ai] into b[j:bj], pump out
+		//  the matching block, and move (i,j) beyond the match
+		ai, bj, size := m.A, m.B, m.Size
+		tag := byte(0)
+		if i < ai && j < bj {
+			tag = 'r'
+		} else if i < ai {
+			tag = 'd'
+		} else if j < bj {
+			tag = 'i'
+		}
+		if tag > 0 {
+			opCodes = append(opCodes, OpCode{tag, i, ai, j, bj})
+		}
+		i, j = ai+size, bj+size
+		// the list of matching blocks is terminated by a
+		// sentinel with size 0
+		if size > 0 {
+			opCodes = append(opCodes, OpCode{'e', ai, i, bj, j})
+		}
+	}
+	m.opCodes = opCodes
+	return m.opCodes
+}
+
+// Isolate change clusters by eliminating ranges with no changes.
+//
+// Return a generator of groups with up to n lines of context.
+// Each group is in the same format as returned by GetOpCodes().
+func (m *SequenceMatcher) GetGroupedOpCodes(n int) [][]OpCode {
+	if n < 0 {
+		n = 3
+	}
+	codes := m.GetOpCodes()
+	if len(codes) == 0 {
+		codes = []OpCode{{'e', 0, 1, 0, 1}}
+	}
+	// Fixup leading and trailing groups if they show no changes.
+	if codes[0].Tag == 'e' {
+		c := codes[0]
+		i1, i2, j1, j2 := c.I1, c.I2, c.J1, c.J2
+		codes[0] = OpCode{c.Tag, max(i1, i2-n), i2, max(j1, j2-n), j2}
+	}
+	if codes[len(codes)-1].Tag == 'e' {
+		c := codes[len(codes)-1]
+		i1, i2, j1, j2 := c.I1, c.I2, c.J1, c.J2
+		codes[len(codes)-1] = OpCode{c.Tag, i1, min(i2, i1+n), j1, min(j2, j1+n)}
+	}
+	nn := n + n
+	groups := [][]OpCode{}
+	group := []OpCode{}
+	for _, c := range codes {
+		i1, i2, j1, j2 := c.I1, c.I2, c.J1, c.J2
+		// End the current group and start a new one whenever
+		// there is a large range with no changes.
+		if c.Tag == 'e' && i2-i1 > nn {
+			group = append(group, OpCode{
+				c.Tag, i1, min(i2, i1+n),
+				j1, min(j2, j1+n),
+			})
+			groups = append(groups, group)
+			group = []OpCode{}
+			i1, j1 = max(i1, i2-n), max(j1, j2-n)
+		}
+		group = append(group, OpCode{c.Tag, i1, i2, j1, j2})
+	}
+	if len(group) > 0 && !(len(group) == 1 && group[0].Tag == 'e') {
+		groups = append(groups, group)
+	}
+	return groups
+}
+
+// Return a measure of the sequences' similarity (float in [0,1]).
+//
+// Where T is the total number of elements in both sequences, and
+// M is the number of matches, this is 2.0*M / T.
+// Note that this is 1 if the sequences are identical, and 0 if
+// they have nothing in common.
+//
+// .Ratio() is expensive to compute if you haven't already computed
+// .GetMatchingBlocks() or .GetOpCodes(), in which case you may
+// want to try .QuickRatio() or .RealQuickRation() first to get an
+// upper bound.
+func (m *SequenceMatcher) Ratio() float64 {
+	matches := 0
+	for _, m := range m.GetMatchingBlocks() {
+		matches += m.Size
+	}
+	return calculateRatio(matches, len(m.a)+len(m.b))
+}
+
+// Return an upper bound on ratio() relatively quickly.
+//
+// This isn't defined beyond that it is an upper bound on .Ratio(), and
+// is faster to compute.
+func (m *SequenceMatcher) QuickRatio() float64 {
+	// viewing a and b as multisets, set matches to the cardinality
+	// of their intersection; this counts the number of matches
+	// without regard to order, so is clearly an upper bound
+	if m.fullBCount == nil {
+		m.fullBCount = map[string]int{}
+		for _, s := range m.b {
+			m.fullBCount[s]++
+		}
+	}
+
+	// avail[x] is the number of times x appears in 'b' less the
+	// number of times we've seen it in 'a' so far ... kinda
+	avail := map[string]int{}
+	matches := 0
+	for _, s := range m.a {
+		n, ok := avail[s]
+		if !ok {
+			n = m.fullBCount[s]
+		}
+		avail[s] = n - 1
+		if n > 0 {
+			matches++
+		}
+	}
+	return calculateRatio(matches, len(m.a)+len(m.b))
+}
+
+// Return an upper bound on ratio() very quickly.
+//
+// This isn't defined beyond that it is an upper bound on .Ratio(), and
+// is faster to compute than either .Ratio() or .QuickRatio().
+func (m *SequenceMatcher) RealQuickRatio() float64 {
+	la, lb := len(m.a), len(m.b)
+	return calculateRatio(min(la, lb), la+lb)
+}
+
+// Convert range to the "ed" format
+func formatRangeUnified(start, stop int) string {
+	// Per the diff spec at http://www.unix.org/single_unix_specification/
+	beginning := start + 1 // lines start numbering with one
+	length := stop - start
+	if length == 1 {
+		return fmt.Sprintf("%d", beginning)
+	}
+	if length == 0 {
+		beginning-- // empty ranges begin at line just before the range
+	}
+	return fmt.Sprintf("%d,%d", beginning, length)
+}
+
+// Unified diff parameters
+type UnifiedDiff struct {
+	A        []string // First sequence lines
+	FromFile string   // First file name
+	FromDate string   // First file time
+	B        []string // Second sequence lines
+	ToFile   string   // Second file name
+	ToDate   string   // Second file time
+	Eol      string   // Headers end of line, defaults to LF
+	Context  int      // Number of context lines
+}
+
+// Compare two sequences of lines; generate the delta as a unified diff.
+//
+// Unified diffs are a compact way of showing line changes and a few
+// lines of context.  The number of context lines is set by 'n' which
+// defaults to three.
+//
+// By default, the diff control lines (those with ---, +++, or @@) are
+// created with a trailing newline.  This is helpful so that inputs
+// created from file.readlines() result in diffs that are suitable for
+// file.writelines() since both the inputs and outputs have trailing
+// newlines.
+//
+// For inputs that do not have trailing newlines, set the lineterm
+// argument to "" so that the output will be uniformly newline free.
+//
+// The unidiff format normally has a header for filenames and modification
+// times.  Any or all of these may be specified using strings for
+// 'fromfile', 'tofile', 'fromfiledate', and 'tofiledate'.
+// The modification times are normally expressed in the ISO 8601 format.
+func WriteUnifiedDiff(writer io.Writer, diff UnifiedDiff) error {
+	buf := bufio.NewWriter(writer)
+	defer buf.Flush()
+	wf := func(format string, args ...interface{}) error {
+		_, err := buf.WriteString(fmt.Sprintf(format, args...))
+		return err
+	}
+	ws := func(s string) error {
+		_, err := buf.WriteString(s)
+		return err
+	}
+
+	if len(diff.Eol) == 0 {
+		diff.Eol = "\n"
+	}
+
+	started := false
+	m := NewMatcher(diff.A, diff.B)
+	for _, g := range m.GetGroupedOpCodes(diff.Context) {
+		if !started {
+			started = true
+			fromDate := ""
+			if len(diff.FromDate) > 0 {
+				fromDate = "\t" + diff.FromDate
+			}
+			toDate := ""
+			if len(diff.ToDate) > 0 {
+				toDate = "\t" + diff.ToDate
+			}
+			if diff.FromFile != "" || diff.ToFile != "" {
+				err := wf("--- %s%s%s", diff.FromFile, fromDate, diff.Eol)
+				if err != nil {
+					return err
+				}
+				err = wf("+++ %s%s%s", diff.ToFile, toDate, diff.Eol)
+				if err != nil {
+					return err
+				}
+			}
+		}
+		first, last := g[0], g[len(g)-1]
+		range1 := formatRangeUnified(first.I1, last.I2)
+		range2 := formatRangeUnified(first.J1, last.J2)
+		if err := wf("@@ -%s +%s @@%s", range1, range2, diff.Eol); err != nil {
+			return err
+		}
+		for _, c := range g {
+			i1, i2, j1, j2 := c.I1, c.I2, c.J1, c.J2
+			if c.Tag == 'e' {
+				for _, line := range diff.A[i1:i2] {
+					if err := ws(" " + line); err != nil {
+						return err
+					}
+				}
+				continue
+			}
+			if c.Tag == 'r' || c.Tag == 'd' {
+				for _, line := range diff.A[i1:i2] {
+					if err := ws("-" + line); err != nil {
+						return err
+					}
+				}
+			}
+			if c.Tag == 'r' || c.Tag == 'i' {
+				for _, line := range diff.B[j1:j2] {
+					if err := ws("+" + line); err != nil {
+						return err
+					}
+				}
+			}
+		}
+	}
+	return nil
+}
+
+// Like WriteUnifiedDiff but returns the diff a string.
+func GetUnifiedDiffString(diff UnifiedDiff) (string, error) {
+	w := &bytes.Buffer{}
+	err := WriteUnifiedDiff(w, diff)
+	return w.String(), err
+}
+
+// Split a string on "\n" while preserving them. The output can be used
+// as input for UnifiedDiff and ContextDiff structures.
+func SplitLines(s string) []string {
+	lines := strings.SplitAfter(s, "\n")
+	lines[len(lines)-1] += "\n"
+	return lines
+}

prometheus/internal/difflib_test.go

@@ -0,0 +1,266 @@
+// Copyright 2022 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package internal
+
+import (
+	"bytes"
+	"fmt"
+	"math"
+	"reflect"
+	"strings"
+	"testing"
+)
+
+func assertAlmostEqual(t *testing.T, a, b float64, places int) {
+	if math.Abs(a-b) > math.Pow10(-places) {
+		t.Errorf("%.7f != %.7f", a, b)
+	}
+}
+
+func assertEqual(t *testing.T, a, b interface{}) {
+	if !reflect.DeepEqual(a, b) {
+		t.Errorf("%v != %v", a, b)
+	}
+}
+
+func splitChars(s string) []string {
+	chars := make([]string, 0, len(s))
+	// Assume ASCII inputs
+	for i := 0; i != len(s); i++ {
+		chars = append(chars, string(s[i]))
+	}
+	return chars
+}
+
+func TestSequenceMatcherRatio(t *testing.T) {
+	s := NewMatcher(splitChars("abcd"), splitChars("bcde"))
+	assertEqual(t, s.Ratio(), 0.75)
+	assertEqual(t, s.QuickRatio(), 0.75)
+	assertEqual(t, s.RealQuickRatio(), 1.0)
+}
+
+func TestGetOptCodes(t *testing.T) {
+	a := "qabxcd"
+	b := "abycdf"
+	s := NewMatcher(splitChars(a), splitChars(b))
+	w := &bytes.Buffer{}
+	for _, op := range s.GetOpCodes() {
+		fmt.Fprintf(w, "%s a[%d:%d], (%s) b[%d:%d] (%s)\n", string(op.Tag),
+			op.I1, op.I2, a[op.I1:op.I2], op.J1, op.J2, b[op.J1:op.J2])
+	}
+	result := w.String()
+	expected := `d a[0:1], (q) b[0:0] ()
+e a[1:3], (ab) b[0:2] (ab)
+r a[3:4], (x) b[2:3] (y)
+e a[4:6], (cd) b[3:5] (cd)
+i a[6:6], () b[5:6] (f)
+`
+	if expected != result {
+		t.Errorf("unexpected op codes: \n%s", result)
+	}
+}
+
+func TestGroupedOpCodes(t *testing.T) {
+	a := []string{}
+	for i := 0; i != 39; i++ {
+		a = append(a, fmt.Sprintf("%02d", i))
+	}
+	b := []string{}
+	b = append(b, a[:8]...)
+	b = append(b, " i")
+	b = append(b, a[8:19]...)
+	b = append(b, " x")
+	b = append(b, a[20:22]...)
+	b = append(b, a[27:34]...)
+	b = append(b, " y")
+	b = append(b, a[35:]...)
+	s := NewMatcher(a, b)
+	w := &bytes.Buffer{}
+	for _, g := range s.GetGroupedOpCodes(-1) {
+		fmt.Fprintf(w, "group\n")
+		for _, op := range g {
+			fmt.Fprintf(w, "  %s, %d, %d, %d, %d\n", string(op.Tag),
+				op.I1, op.I2, op.J1, op.J2)
+		}
+	}
+	result := w.String()
+	expected := `group
+  e, 5, 8, 5, 8
+  i, 8, 8, 8, 9
+  e, 8, 11, 9, 12
+group
+  e, 16, 19, 17, 20
+  r, 19, 20, 20, 21
+  e, 20, 22, 21, 23
+  d, 22, 27, 23, 23
+  e, 27, 30, 23, 26
+group
+  e, 31, 34, 27, 30
+  r, 34, 35, 30, 31
+  e, 35, 38, 31, 34
+`
+	if expected != result {
+		t.Errorf("unexpected op codes: \n%s", result)
+	}
+}
+
+func ExampleGetUnifiedDiffCode() {
+	a := `one
+two
+three
+four
+fmt.Printf("%s,%T",a,b)`
+	b := `zero
+one
+three
+four`
+	diff := UnifiedDiff{
+		A:        SplitLines(a),
+		B:        SplitLines(b),
+		FromFile: "Original",
+		FromDate: "2005-01-26 23:30:50",
+		ToFile:   "Current",
+		ToDate:   "2010-04-02 10:20:52",
+		Context:  3,
+	}
+	result, _ := GetUnifiedDiffString(diff)
+	fmt.Println(strings.ReplaceAll(result, "\t", " "))
+	// Output:
+	// --- Original 2005-01-26 23:30:50
+	// +++ Current 2010-04-02 10:20:52
+	// @@ -1,5 +1,4 @@
+	// +zero
+	//  one
+	// -two
+	//  three
+	//  four
+	// -fmt.Printf("%s,%T",a,b)
+}
+
+func rep(s string, count int) string {
+	return strings.Repeat(s, count)
+}
+
+func TestWithAsciiOneInsert(t *testing.T) {
+	sm := NewMatcher(splitChars(rep("b", 100)),
+		splitChars("a"+rep("b", 100)))
+	assertAlmostEqual(t, sm.Ratio(), 0.995, 3)
+	assertEqual(t, sm.GetOpCodes(),
+		[]OpCode{{'i', 0, 0, 0, 1}, {'e', 0, 100, 1, 101}})
+	assertEqual(t, len(sm.bPopular), 0)
+
+	sm = NewMatcher(splitChars(rep("b", 100)),
+		splitChars(rep("b", 50)+"a"+rep("b", 50)))
+	assertAlmostEqual(t, sm.Ratio(), 0.995, 3)
+	assertEqual(t, sm.GetOpCodes(),
+		[]OpCode{{'e', 0, 50, 0, 50}, {'i', 50, 50, 50, 51}, {'e', 50, 100, 51, 101}})
+	assertEqual(t, len(sm.bPopular), 0)
+}
+
+func TestWithAsciiOnDelete(t *testing.T) {
+	sm := NewMatcher(splitChars(rep("a", 40)+"c"+rep("b", 40)),
+		splitChars(rep("a", 40)+rep("b", 40)))
+	assertAlmostEqual(t, sm.Ratio(), 0.994, 3)
+	assertEqual(t, sm.GetOpCodes(),
+		[]OpCode{{'e', 0, 40, 0, 40}, {'d', 40, 41, 40, 40}, {'e', 41, 81, 40, 80}})
+}
+
+func TestWithAsciiBJunk(t *testing.T) {
+	isJunk := func(s string) bool {
+		return s == " "
+	}
+	sm := NewMatcherWithJunk(splitChars(rep("a", 40)+rep("b", 40)),
+		splitChars(rep("a", 44)+rep("b", 40)), true, isJunk)
+	assertEqual(t, sm.bJunk, map[string]struct{}{})
+
+	sm = NewMatcherWithJunk(splitChars(rep("a", 40)+rep("b", 40)),
+		splitChars(rep("a", 44)+rep("b", 40)+rep(" ", 20)), false, isJunk)
+	assertEqual(t, sm.bJunk, map[string]struct{}{" ": {}})
+
+	isJunk = func(s string) bool {
+		return s == " " || s == "b"
+	}
+	sm = NewMatcherWithJunk(splitChars(rep("a", 40)+rep("b", 40)),
+		splitChars(rep("a", 44)+rep("b", 40)+rep(" ", 20)), false, isJunk)
+	assertEqual(t, sm.bJunk, map[string]struct{}{" ": {}, "b": {}})
+}
+
+func TestSFBugsRatioForNullSeqn(t *testing.T) {
+	sm := NewMatcher(nil, nil)
+	assertEqual(t, sm.Ratio(), 1.0)
+	assertEqual(t, sm.QuickRatio(), 1.0)
+	assertEqual(t, sm.RealQuickRatio(), 1.0)
+}
+
+func TestSFBugsComparingEmptyLists(t *testing.T) {
+	groups := NewMatcher(nil, nil).GetGroupedOpCodes(-1)
+	assertEqual(t, len(groups), 0)
+	diff := UnifiedDiff{
+		FromFile: "Original",
+		ToFile:   "Current",
+		Context:  3,
+	}
+	result, err := GetUnifiedDiffString(diff)
+	assertEqual(t, err, nil)
+	assertEqual(t, result, "")
+}
+
+func TestOutputFormatRangeFormatUnified(t *testing.T) {
+	// Per the diff spec at http://www.unix.org/single_unix_specification/
+	//
+	// Each <range> field shall be of the form:
+	//   %1d", <beginning line number>  if the range contains exactly one line,
+	// and:
+	//  "%1d,%1d", <beginning line number>, <number of lines> otherwise.
+	// If a range is empty, its beginning line number shall be the number of
+	// the line just before the range, or 0 if the empty range starts the file.
+	fm := formatRangeUnified
+	assertEqual(t, fm(3, 3), "3,0")
+	assertEqual(t, fm(3, 4), "4")
+	assertEqual(t, fm(3, 5), "4,2")
+	assertEqual(t, fm(3, 6), "4,3")
+	assertEqual(t, fm(0, 0), "0,0")
+}
+
+func TestSplitLines(t *testing.T) {
+	allTests := []struct {
+		input string
+		want  []string
+	}{
+		{"foo", []string{"foo\n"}},
+		{"foo\nbar", []string{"foo\n", "bar\n"}},
+		{"foo\nbar\n", []string{"foo\n", "bar\n", "\n"}},
+	}
+	for _, test := range allTests {
+		assertEqual(t, SplitLines(test.input), test.want)
+	}
+}
+
+func benchmarkSplitLines(b *testing.B, count int) {
+	str := strings.Repeat("foo\n", count)
+
+	b.ResetTimer()
+
+	n := 0
+	for i := 0; i < b.N; i++ {
+		n += len(SplitLines(str))
+	}
+}
+
+func BenchmarkSplitLines100(b *testing.B) {
+	benchmarkSplitLines(b, 100)
+}
+
+func BenchmarkSplitLines10000(b *testing.B) {
+	benchmarkSplitLines(b, 10000)
+}

prometheus/internal/go_collector_options.go

@@ -0,0 +1,32 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal
+
+import "regexp"
+
+type GoCollectorRule struct {
+	Matcher *regexp.Regexp
+	Deny    bool
+}
+
+// GoCollectorOptions should not be used be directly by anything, except `collectors` package.
+// Use it via collectors package instead. See issue
+// https://git.internal/re/client_golang/issues/1030.
+//
+// This is internal, so external users only can use it via `collector.WithGoCollector*` methods
+type GoCollectorOptions struct {
+	DisableMemStatsLikeMetrics bool
+	RuntimeMetricSumForHist    map[string]string
+	RuntimeMetricRules         []GoCollectorRule
+}

prometheus/internal/go_runtime_metrics.go

@@ -0,0 +1,142 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build go1.17
+// +build go1.17
+
+package internal
+
+import (
+	"math"
+	"path"
+	"runtime/metrics"
+	"strings"
+
+	"github.com/prometheus/common/model"
+)
+
+// RuntimeMetricsToProm produces a Prometheus metric name from a runtime/metrics
+// metric description and validates whether the metric is suitable for integration
+// with Prometheus.
+//
+// Returns false if a name could not be produced, or if Prometheus does not understand
+// the runtime/metrics Kind.
+//
+// Note that the main reason a name couldn't be produced is if the runtime/metrics
+// package exports a name with characters outside the valid Prometheus metric name
+// character set. This is theoretically possible, but should never happen in practice.
+// Still, don't rely on it.
+func RuntimeMetricsToProm(d *metrics.Description) (string, string, string, bool) {
+	namespace := "go"
+
+	comp := strings.SplitN(d.Name, ":", 2)
+	key := comp[0]
+	unit := comp[1]
+
+	// The last path element in the key is the name,
+	// the rest is the subsystem.
+	subsystem := path.Dir(key[1:] /* remove leading / */)
+	name := path.Base(key)
+
+	// subsystem is translated by replacing all / and - with _.
+	subsystem = strings.ReplaceAll(subsystem, "/", "_")
+	subsystem = strings.ReplaceAll(subsystem, "-", "_")
+
+	// unit is translated assuming that the unit contains no
+	// non-ASCII characters.
+	unit = strings.ReplaceAll(unit, "-", "_")
+	unit = strings.ReplaceAll(unit, "*", "_")
+	unit = strings.ReplaceAll(unit, "/", "_per_")
+
+	// name has - replaced with _ and is concatenated with the unit and
+	// other data.
+	name = strings.ReplaceAll(name, "-", "_")
+	name += "_" + unit
+	if d.Cumulative && d.Kind != metrics.KindFloat64Histogram {
+		name += "_total"
+	}
+
+	valid := model.IsValidMetricName(model.LabelValue(namespace + "_" + subsystem + "_" + name))
+	switch d.Kind {
+	case metrics.KindUint64:
+	case metrics.KindFloat64:
+	case metrics.KindFloat64Histogram:
+	default:
+		valid = false
+	}
+	return namespace, subsystem, name, valid
+}
+
+// RuntimeMetricsBucketsForUnit takes a set of buckets obtained for a runtime/metrics histogram
+// type (so, lower-bound inclusive) and a unit from a runtime/metrics name, and produces
+// a reduced set of buckets. This function always removes any -Inf bucket as it's represented
+// as the bottom-most upper-bound inclusive bucket in Prometheus.
+func RuntimeMetricsBucketsForUnit(buckets []float64, unit string) []float64 {
+	switch unit {
+	case "bytes":
+		// Re-bucket as powers of 2.
+		return reBucketExp(buckets, 2)
+	case "seconds":
+		// Re-bucket as powers of 10 and then merge all buckets greater
+		// than 1 second into the +Inf bucket.
+		b := reBucketExp(buckets, 10)
+		for i := range b {
+			if b[i] <= 1 {
+				continue
+			}
+			b[i] = math.Inf(1)
+			b = b[:i+1]
+			break
+		}
+		return b
+	}
+	return buckets
+}
+
+// reBucketExp takes a list of bucket boundaries (lower bound inclusive) and
+// downsamples the buckets to those a multiple of base apart. The end result
+// is a roughly exponential (in many cases, perfectly exponential) bucketing
+// scheme.
+func reBucketExp(buckets []float64, base float64) []float64 {
+	bucket := buckets[0]
+	var newBuckets []float64
+	// We may see a -Inf here, in which case, add it and skip it
+	// since we risk producing NaNs otherwise.
+	//
+	// We need to preserve -Inf values to maintain runtime/metrics
+	// conventions. We'll strip it out later.
+	if bucket == math.Inf(-1) {
+		newBuckets = append(newBuckets, bucket)
+		buckets = buckets[1:]
+		bucket = buckets[0]
+	}
+	// From now on, bucket should always have a non-Inf value because
+	// Infs are only ever at the ends of the bucket lists, so
+	// arithmetic operations on it are non-NaN.
+	for i := 1; i < len(buckets); i++ {
+		if bucket >= 0 && buckets[i] < bucket*base {
+			// The next bucket we want to include is at least bucket*base.
+			continue
+		} else if bucket < 0 && buckets[i] < bucket/base {
+			// In this case the bucket we're targeting is negative, and since
+			// we're ascending through buckets here, we need to divide to get
+			// closer to zero exponentially.
+			continue
+		}
+		// The +Inf bucket will always be the last one, and we'll always
+		// end up including it here because bucket
+		newBuckets = append(newBuckets, bucket)
+		bucket = buckets[i]
+	}
+	return append(newBuckets, bucket)
+}

prometheus/internal/go_runtime_metrics_test.go

@@ -0,0 +1,97 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build go1.17
+// +build go1.17
+
+package internal
+
+import (
+	"runtime/metrics"
+	"testing"
+)
+
+func TestRuntimeMetricsToProm(t *testing.T) {
+	tests := []struct {
+		got    metrics.Description
+		expect string
+	}{
+		{
+			metrics.Description{
+				Name: "/memory/live:bytes",
+				Kind: metrics.KindUint64,
+			},
+			"go_memory_live_bytes",
+		},
+		{
+			metrics.Description{
+				Name:       "/memory/allocs:bytes",
+				Kind:       metrics.KindUint64,
+				Cumulative: true,
+			},
+			"go_memory_allocs_bytes_total",
+		},
+		{
+			metrics.Description{
+				Name: "/memory/alloc-rate:bytes/second",
+				Kind: metrics.KindFloat64,
+			},
+			"go_memory_alloc_rate_bytes_per_second",
+		},
+		{
+			metrics.Description{
+				Name:       "/gc/time:cpu*seconds",
+				Kind:       metrics.KindFloat64,
+				Cumulative: true,
+			},
+			"go_gc_time_cpu_seconds_total",
+		},
+		{
+			metrics.Description{
+				Name: "/this/is/a/very/deep/metric:metrics",
+				Kind: metrics.KindFloat64,
+			},
+			"go_this_is_a_very_deep_metric_metrics",
+		},
+		{
+			metrics.Description{
+				Name: "/this*is*an*invalid...:µname",
+				Kind: metrics.KindUint64,
+			},
+			"",
+		},
+		{
+			metrics.Description{
+				Name: "/this/is/a/valid/name:objects",
+				Kind: metrics.KindBad,
+			},
+			"",
+		},
+	}
+	for _, test := range tests {
+		ns, ss, n, ok := RuntimeMetricsToProm(&test.got)
+		name := ns + "_" + ss + "_" + n
+		if test.expect == "" && ok {
+			t.Errorf("bad input expected a bad output: input %s, got %s", test.got.Name, name)
+			continue
+		}
+		if test.expect != "" && !ok {
+			t.Errorf("unexpected bad output on good input: input %s", test.got.Name)
+			continue
+		}
+		if test.expect != "" && name != test.expect {
+			t.Errorf("expected %s, got %s", test.expect, name)
+			continue
+		}
+	}
+}

prometheus/internal/metric.go

@@ -19,18 +19,34 @@ import (
 	dto "github.com/prometheus/client_model/go"
 )
 
-// metricSorter is a sortable slice of *dto.Metric.
-type metricSorter []*dto.Metric
+// LabelPairSorter implements sort.Interface. It is used to sort a slice of
+// dto.LabelPair pointers.
+type LabelPairSorter []*dto.LabelPair
 
-func (s metricSorter) Len() int {
+func (s LabelPairSorter) Len() int {
 	return len(s)
 }
 
-func (s metricSorter) Swap(i, j int) {
+func (s LabelPairSorter) Swap(i, j int) {
 	s[i], s[j] = s[j], s[i]
 }
 
-func (s metricSorter) Less(i, j int) bool {
+func (s LabelPairSorter) Less(i, j int) bool {
+	return s[i].GetName() < s[j].GetName()
+}
+
+// MetricSorter is a sortable slice of *dto.Metric.
+type MetricSorter []*dto.Metric
+
+func (s MetricSorter) Len() int {
+	return len(s)
+}
+
+func (s MetricSorter) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
+
+func (s MetricSorter) Less(i, j int) bool {
 	if len(s[i].Label) != len(s[j].Label) {
 		// This should not happen. The metrics are
 		// inconsistent. However, we have to deal with the fact, as
@@ -68,7 +84,7 @@ func (s metricSorter) Less(i, j int) bool {
 // the slice, with the contained Metrics sorted within each MetricFamily.
 func NormalizeMetricFamilies(metricFamiliesByName map[string]*dto.MetricFamily) []*dto.MetricFamily {
 	for _, mf := range metricFamiliesByName {
-		sort.Sort(metricSorter(mf.Metric))
+		sort.Sort(MetricSorter(mf.Metric))
 	}
 	names := make([]string, 0, len(metricFamiliesByName))
 	for name, mf := range metricFamiliesByName {

prometheus/labels.go

@@ -25,7 +25,8 @@ import (
 // Labels represents a collection of label name -> value mappings. This type is
 // commonly used with the With(Labels) and GetMetricWith(Labels) methods of
 // metric vector Collectors, e.g.:
-//     myVec.With(Labels{"code": "404", "method": "GET"}).Add(42)
+//
+//	myVec.With(Labels{"code": "404", "method": "GET"}).Add(42)
 //
 // The other use-case is the specification of constant label pairs in Opts or to
 // create a Desc.
@@ -39,7 +40,7 @@ var errInconsistentCardinality = errors.New("inconsistent label cardinality")
 
 func makeInconsistentCardinalityError(fqName string, labels, labelValues []string) error {
 	return fmt.Errorf(
-		"%s: %q has %d variable labels named %q but %d values %q were provided",
+		"%w: %q has %d variable labels named %q but %d values %q were provided",
 		errInconsistentCardinality, fqName,
 		len(labels), labels,
 		len(labelValues), labelValues,
@@ -49,7 +50,7 @@ func makeInconsistentCardinalityError(fqName string, labels, labelValues []strin
 func validateValuesInLabels(labels Labels, expectedNumberOfValues int) error {
 	if len(labels) != expectedNumberOfValues {
 		return fmt.Errorf(
-			"%s: expected %d label values but got %d in %#v",
+			"%w: expected %d label values but got %d in %#v",
 			errInconsistentCardinality, expectedNumberOfValues,
 			len(labels), labels,
 		)
@@ -67,7 +68,7 @@ func validateValuesInLabels(labels Labels, expectedNumberOfValues int) error {
 func validateLabelValues(vals []string, expectedNumberOfValues int) error {
 	if len(vals) != expectedNumberOfValues {
 		return fmt.Errorf(
-			"%s: expected %d label values but got %d in %#v",
+			"%w: expected %d label values but got %d in %#v",
 			errInconsistentCardinality, expectedNumberOfValues,
 			len(vals), vals,
 		)

prometheus/metric.go

@@ -14,6 +14,9 @@
 package prometheus
 
 import (
+	"errors"
+	"math"
+	"sort"
 	"strings"
 	"time"
 
@@ -115,22 +118,6 @@ func BuildFQName(namespace, subsystem, name string) string {
 	return name
 }
 
-// labelPairSorter implements sort.Interface. It is used to sort a slice of
-// dto.LabelPair pointers.
-type labelPairSorter []*dto.LabelPair
-
-func (s labelPairSorter) Len() int {
-	return len(s)
-}
-
-func (s labelPairSorter) Swap(i, j int) {
-	s[i], s[j] = s[j], s[i]
-}
-
-func (s labelPairSorter) Less(i, j int) bool {
-	return s[i].GetName() < s[j].GetName()
-}
-
 type invalidMetric struct {
 	desc *Desc
 	err  error
@@ -174,3 +161,96 @@ func (m timestampedMetric) Write(pb *dto.Metric) error {
 func NewMetricWithTimestamp(t time.Time, m Metric) Metric {
 	return timestampedMetric{Metric: m, t: t}
 }
+
+type withExemplarsMetric struct {
+	Metric
+
+	exemplars []*dto.Exemplar
+}
+
+func (m *withExemplarsMetric) Write(pb *dto.Metric) error {
+	if err := m.Metric.Write(pb); err != nil {
+		return err
+	}
+
+	switch {
+	case pb.Counter != nil:
+		pb.Counter.Exemplar = m.exemplars[len(m.exemplars)-1]
+	case pb.Histogram != nil:
+		for _, e := range m.exemplars {
+			// pb.Histogram.Bucket are sorted by UpperBound.
+			i := sort.Search(len(pb.Histogram.Bucket), func(i int) bool {
+				return pb.Histogram.Bucket[i].GetUpperBound() >= e.GetValue()
+			})
+			if i < len(pb.Histogram.Bucket) {
+				pb.Histogram.Bucket[i].Exemplar = e
+			} else {
+				// The +Inf bucket should be explicitly added if there is an exemplar for it, similar to non-const histogram logic in https://git.internal/re/client_golang/blob/main/prometheus/histogram.go#L357-L365.
+				b := &dto.Bucket{
+					CumulativeCount: proto.Uint64(pb.Histogram.GetSampleCount()),
+					UpperBound:      proto.Float64(math.Inf(1)),
+					Exemplar:        e,
+				}
+				pb.Histogram.Bucket = append(pb.Histogram.Bucket, b)
+			}
+		}
+	default:
+		// TODO(bwplotka): Implement Gauge?
+		return errors.New("cannot inject exemplar into Gauge, Summary or Untyped")
+	}
+
+	return nil
+}
+
+// Exemplar is easier to use, user-facing representation of *dto.Exemplar.
+type Exemplar struct {
+	Value  float64
+	Labels Labels
+	// Optional.
+	// Default value (time.Time{}) indicates its empty, which should be
+	// understood as time.Now() time at the moment of creation of metric.
+	Timestamp time.Time
+}
+
+// NewMetricWithExemplars returns a new Metric wrapping the provided Metric with given
+// exemplars. Exemplars are validated.
+//
+// Only last applicable exemplar is injected from the list.
+// For example for Counter it means last exemplar is injected.
+// For Histogram, it means last applicable exemplar for each bucket is injected.
+//
+// NewMetricWithExemplars works best with MustNewConstMetric and
+// MustNewConstHistogram, see example.
+func NewMetricWithExemplars(m Metric, exemplars ...Exemplar) (Metric, error) {
+	if len(exemplars) == 0 {
+		return nil, errors.New("no exemplar was passed for NewMetricWithExemplars")
+	}
+
+	var (
+		now = time.Now()
+		exs = make([]*dto.Exemplar, len(exemplars))
+		err error
+	)
+	for i, e := range exemplars {
+		ts := e.Timestamp
+		if ts == (time.Time{}) {
+			ts = now
+		}
+		exs[i], err = newExemplar(e.Value, ts, e.Labels)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return &withExemplarsMetric{Metric: m, exemplars: exs}, nil
+}
+
+// MustNewMetricWithExemplars is a version of NewMetricWithExemplars that panics where
+// NewMetricWithExemplars would have returned an error.
+func MustNewMetricWithExemplars(m Metric, exemplars ...Exemplar) Metric {
+	ret, err := NewMetricWithExemplars(m, exemplars...)
+	if err != nil {
+		panic(err)
+	}
+	return ret
+}

prometheus/metric_test.go

@@ -13,7 +13,14 @@
 
 package prometheus
 
-import "testing"
+import (
+	"math"
+	"testing"
+
+	//nolint:staticcheck // Ignore SA1019. Need to keep deprecated package for compatibility.
+	"github.com/golang/protobuf/proto"
+	dto "github.com/prometheus/client_model/go"
+)
 
 func TestBuildFQName(t *testing.T) {
 	scenarios := []struct{ namespace, subsystem, name, result string }{
@@ -33,3 +40,53 @@ func TestBuildFQName(t *testing.T) {
 		}
 	}
 }
+
+func TestWithExemplarsMetric(t *testing.T) {
+	t.Run("histogram", func(t *testing.T) {
+		// Create a constant histogram from values we got from a 3rd party telemetry system.
+		h := MustNewConstHistogram(
+			NewDesc("http_request_duration_seconds", "A histogram of the HTTP request durations.", nil, nil),
+			4711, 403.34,
+			// Four buckets, but we expect five as the +Inf bucket will be created if we see value outside of those buckets.
+			map[float64]uint64{25: 121, 50: 2403, 100: 3221, 200: 4233},
+		)
+
+		m := &withExemplarsMetric{Metric: h, exemplars: []*dto.Exemplar{
+			{Value: proto.Float64(2000.0)}, // Unordered exemplars.
+			{Value: proto.Float64(500.0)},
+			{Value: proto.Float64(42.0)},
+			{Value: proto.Float64(157.0)},
+			{Value: proto.Float64(100.0)},
+			{Value: proto.Float64(89.0)},
+			{Value: proto.Float64(24.0)},
+			{Value: proto.Float64(25.1)},
+		}}
+		metric := dto.Metric{}
+		if err := m.Write(&metric); err != nil {
+			t.Fatal(err)
+		}
+		if want, got := 5, len(metric.GetHistogram().Bucket); want != got {
+			t.Errorf("want %v, got %v", want, got)
+		}
+
+		expectedExemplarVals := []float64{24.0, 25.1, 89.0, 157.0, 500.0}
+		for i, b := range metric.GetHistogram().Bucket {
+			if b.Exemplar == nil {
+				t.Errorf("Expected exemplar for bucket %v, got nil", i)
+			}
+			if want, got := expectedExemplarVals[i], *metric.GetHistogram().Bucket[i].Exemplar.Value; want != got {
+				t.Errorf("%v: want %v, got %v", i, want, got)
+			}
+		}
+
+		infBucket := metric.GetHistogram().Bucket[len(metric.GetHistogram().Bucket)-1]
+
+		if want, got := math.Inf(1), infBucket.GetUpperBound(); want != got {
+			t.Errorf("want %v, got %v", want, got)
+		}
+
+		if want, got := uint64(4711), infBucket.GetCumulativeCount(); want != got {
+			t.Errorf("want %v, got %v", want, got)
+		}
+	})
+}

prometheus/num_threads.go

@@ -0,0 +1,25 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !js || wasm
+// +build !js wasm
+
+package prometheus
+
+import "runtime"
+
+// getRuntimeNumThreads returns the number of open OS threads.
+func getRuntimeNumThreads() float64 {
+	n, _ := runtime.ThreadCreateProfile(nil)
+	return float64(n)
+}

prometheus/num_threads_gopherjs.go

@@ -0,0 +1,22 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build js && !wasm
+// +build js,!wasm
+
+package prometheus
+
+// getRuntimeNumThreads returns the number of open OS threads.
+func getRuntimeNumThreads() float64 {
+	return 1
+}

prometheus/observer.go

@@ -58,7 +58,7 @@ type ObserverVec interface {
 // current time as timestamp, and the provided Labels. Empty Labels will lead to
 // a valid (label-less) exemplar. But if Labels is nil, the current exemplar is
 // left in place. ObserveWithExemplar panics if any of the provided labels are
-// invalid or if the provided labels contain more than 64 runes in total.
+// invalid or if the provided labels contain more than 128 runes in total.
 type ExemplarObserver interface {
 	ObserveWithExemplar(value float64, exemplar Labels)
 }

prometheus/process_collector.go

@@ -16,7 +16,6 @@ package prometheus
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strconv"
 	"strings"
@@ -104,8 +103,7 @@ func NewProcessCollector(opts ProcessCollectorOpts) Collector {
 	}
 
 	if opts.PidFn == nil {
-		pid := os.Getpid()
-		c.pidFn = func() (int, error) { return pid, nil }
+		c.pidFn = getPIDFn()
 	} else {
 		c.pidFn = opts.PidFn
 	}
@@ -152,13 +150,13 @@ func (c *processCollector) reportError(ch chan<- Metric, desc *Desc, err error)
 // It is meant to be used for the PidFn field in ProcessCollectorOpts.
 func NewPidFileFn(pidFilePath string) func() (int, error) {
 	return func() (int, error) {
-		content, err := ioutil.ReadFile(pidFilePath)
+		content, err := os.ReadFile(pidFilePath)
 		if err != nil {
-			return 0, fmt.Errorf("can't read pid file %q: %+v", pidFilePath, err)
+			return 0, fmt.Errorf("can't read pid file %q: %w", pidFilePath, err)
 		}
 		pid, err := strconv.Atoi(strings.TrimSpace(string(content)))
 		if err != nil {
-			return 0, fmt.Errorf("can't parse pid file %q: %+v", pidFilePath, err)
+			return 0, fmt.Errorf("can't parse pid file %q: %w", pidFilePath, err)
 		}
 
 		return pid, nil

prometheus/process_collector_js.go

@@ -1,4 +1,4 @@
-// Copyright 2021 The Prometheus Authors
+// Copyright 2019 The Prometheus Authors
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
@@ -11,20 +11,16 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build go1.15
+//go:build js
+// +build js
 
-package collectors
+package prometheus
 
-import (
-	"database/sql"
-
-	"github.com/prometheus/client_golang/prometheus"
-)
-
-func (c *dbStatsCollector) describeNewInGo115(ch chan<- *prometheus.Desc) {
-	ch <- c.maxIdleTimeClosed
+func canCollectProcess() bool {
+	return false
 }
 
-func (c *dbStatsCollector) collectNewInGo115(ch chan<- prometheus.Metric, stats sql.DBStats) {
-	ch <- prometheus.MustNewConstMetric(c.maxIdleTimeClosed, prometheus.CounterValue, float64(stats.MaxIdleTimeClosed))
+func (c *processCollector) processCollect(ch chan<- Metric) {
+	// noop on this platform
+	return
 }

prometheus/process_collector_other.go

@@ -11,7 +11,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !windows
+//go:build !windows && !js
+// +build !windows,!js
 
 package prometheus
 

prometheus/process_collector_test.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build linux
 // +build linux
 
 package prometheus

prometheus/promauto/auto.go

@@ -14,114 +14,114 @@
 // Package promauto provides alternative constructors for the fundamental
 // Prometheus metric types and their …Vec and …Func variants. The difference to
 // their counterparts in the prometheus package is that the promauto
-// constructors return Collectors that are already registered with a
-// registry. There are two sets of constructors. The constructors in the first
-// set are top-level functions, while the constructors in the other set are
-// methods of the Factory type. The top-level function return Collectors
-// registered with the global registry (prometheus.DefaultRegisterer), while the
-// methods return Collectors registered with the registry the Factory was
-// constructed with. All constructors panic if the registration fails.
+// constructors register the Collectors with a registry before returning them.
+// There are two sets of constructors. The constructors in the first set are
+// top-level functions, while the constructors in the other set are methods of
+// the Factory type. The top-level function return Collectors registered with
+// the global registry (prometheus.DefaultRegisterer), while the methods return
+// Collectors registered with the registry the Factory was constructed with. All
+// constructors panic if the registration fails.
 //
 // The following example is a complete program to create a histogram of normally
 // distributed random numbers from the math/rand package:
 //
-//      package main
+//	package main
 //
-//      import (
-//              "math/rand"
-//              "net/http"
+//	import (
+//	        "math/rand"
+//	        "net/http"
 //
-//              "github.com/prometheus/client_golang/prometheus"
-//              "github.com/prometheus/client_golang/prometheus/promauto"
-//              "github.com/prometheus/client_golang/prometheus/promhttp"
-//      )
+//	        "git.internal/re/client_golang/prometheus"
+//	        "git.internal/re/client_golang/prometheus/promauto"
+//	        "git.internal/re/client_golang/prometheus/promhttp"
+//	)
 //
-//      var histogram = promauto.NewHistogram(prometheus.HistogramOpts{
-//              Name:    "random_numbers",
-//              Help:    "A histogram of normally distributed random numbers.",
-//              Buckets: prometheus.LinearBuckets(-3, .1, 61),
-//      })
+//	var histogram = promauto.NewHistogram(prometheus.HistogramOpts{
+//	        Name:    "random_numbers",
+//	        Help:    "A histogram of normally distributed random numbers.",
+//	        Buckets: prometheus.LinearBuckets(-3, .1, 61),
+//	})
 //
-//      func Random() {
-//              for {
-//                      histogram.Observe(rand.NormFloat64())
-//              }
-//      }
+//	func Random() {
+//	        for {
+//	                histogram.Observe(rand.NormFloat64())
+//	        }
+//	}
 //
-//      func main() {
-//              go Random()
-//              http.Handle("/metrics", promhttp.Handler())
-//              http.ListenAndServe(":1971", nil)
-//      }
+//	func main() {
+//	        go Random()
+//	        http.Handle("/metrics", promhttp.Handler())
+//	        http.ListenAndServe(":1971", nil)
+//	}
 //
 // Prometheus's version of a minimal hello-world program:
 //
-//      package main
+//	package main
 //
-//      import (
-//      	"fmt"
-//      	"net/http"
+//	import (
+//		"fmt"
+//		"net/http"
 //
-//      	"github.com/prometheus/client_golang/prometheus"
-//      	"github.com/prometheus/client_golang/prometheus/promauto"
-//      	"github.com/prometheus/client_golang/prometheus/promhttp"
-//      )
+//		"git.internal/re/client_golang/prometheus"
+//		"git.internal/re/client_golang/prometheus/promauto"
+//		"git.internal/re/client_golang/prometheus/promhttp"
+//	)
 //
-//      func main() {
-//      	http.Handle("/", promhttp.InstrumentHandlerCounter(
-//      		promauto.NewCounterVec(
-//      			prometheus.CounterOpts{
-//      				Name: "hello_requests_total",
-//      				Help: "Total number of hello-world requests by HTTP code.",
-//      			},
-//      			[]string{"code"},
-//      		),
-//      		http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-//      			fmt.Fprint(w, "Hello, world!")
-//      		}),
-//      	))
-//      	http.Handle("/metrics", promhttp.Handler())
-//      	http.ListenAndServe(":1971", nil)
-//      }
+//	func main() {
+//		http.Handle("/", promhttp.InstrumentHandlerCounter(
+//			promauto.NewCounterVec(
+//				prometheus.CounterOpts{
+//					Name: "hello_requests_total",
+//					Help: "Total number of hello-world requests by HTTP code.",
+//				},
+//				[]string{"code"},
+//			),
+//			http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+//				fmt.Fprint(w, "Hello, world!")
+//			}),
+//		))
+//		http.Handle("/metrics", promhttp.Handler())
+//		http.ListenAndServe(":1971", nil)
+//	}
 //
 // A Factory is created with the With(prometheus.Registerer) function, which
 // enables two usage pattern. With(prometheus.Registerer) can be called once per
 // line:
 //
-//        var (
-//        	reg           = prometheus.NewRegistry()
-//        	randomNumbers = promauto.With(reg).NewHistogram(prometheus.HistogramOpts{
-//        		Name:    "random_numbers",
-//        		Help:    "A histogram of normally distributed random numbers.",
-//        		Buckets: prometheus.LinearBuckets(-3, .1, 61),
-//        	})
-//        	requestCount = promauto.With(reg).NewCounterVec(
-//        		prometheus.CounterOpts{
-//        			Name: "http_requests_total",
-//        			Help: "Total number of HTTP requests by status code and method.",
-//        		},
-//        		[]string{"code", "method"},
-//        	)
-//        )
+//	var (
+//		reg           = prometheus.NewRegistry()
+//		randomNumbers = promauto.With(reg).NewHistogram(prometheus.HistogramOpts{
+//			Name:    "random_numbers",
+//			Help:    "A histogram of normally distributed random numbers.",
+//			Buckets: prometheus.LinearBuckets(-3, .1, 61),
+//		})
+//		requestCount = promauto.With(reg).NewCounterVec(
+//			prometheus.CounterOpts{
+//				Name: "http_requests_total",
+//				Help: "Total number of HTTP requests by status code and method.",
+//			},
+//			[]string{"code", "method"},
+//		)
+//	)
 //
 // Or it can be used to create a Factory once to be used multiple times:
 //
-//        var (
-//        	reg           = prometheus.NewRegistry()
-//        	factory       = promauto.With(reg)
-//        	randomNumbers = factory.NewHistogram(prometheus.HistogramOpts{
-//        		Name:    "random_numbers",
-//        		Help:    "A histogram of normally distributed random numbers.",
-//        		Buckets: prometheus.LinearBuckets(-3, .1, 61),
-//        	})
-//        	requestCount = factory.NewCounterVec(
-//        		prometheus.CounterOpts{
-//        			Name: "http_requests_total",
-//        			Help: "Total number of HTTP requests by status code and method.",
-//        		},
-//        		[]string{"code", "method"},
-//        	)
-//        )
+//	var (
+//		reg           = prometheus.NewRegistry()
+//		factory       = promauto.With(reg)
+//		randomNumbers = factory.NewHistogram(prometheus.HistogramOpts{
+//			Name:    "random_numbers",
+//			Help:    "A histogram of normally distributed random numbers.",
+//			Buckets: prometheus.LinearBuckets(-3, .1, 61),
+//		})
+//		requestCount = factory.NewCounterVec(
+//			prometheus.CounterOpts{
+//				Name: "http_requests_total",
+//				Help: "Total number of HTTP requests by status code and method.",
+//			},
+//			[]string{"code", "method"},
+//		)
+//	)
 //
 // This appears very handy. So why are these constructors locked away in a
 // separate package?
@@ -159,7 +159,7 @@
 // Enjoy promauto responsibly!
 package promauto
 
-import "github.com/prometheus/client_golang/prometheus"
+import "git.internal/re/client_golang/prometheus"
 
 // NewCounter works like the function of the same name in the prometheus package
 // but it automatically registers the Counter with the

prometheus/promauto/auto_test.go

@@ -16,7 +16,7 @@ package promauto
 import (
 	"testing"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
 )
 
 func TestNil(t *testing.T) {

prometheus/promhttp/delegator.go

@@ -76,16 +76,19 @@ func (r *responseWriterDelegator) Write(b []byte) (int, error) {
 	return n, err
 }
 
-type closeNotifierDelegator struct{ *responseWriterDelegator }
-type flusherDelegator struct{ *responseWriterDelegator }
-type hijackerDelegator struct{ *responseWriterDelegator }
-type readerFromDelegator struct{ *responseWriterDelegator }
-type pusherDelegator struct{ *responseWriterDelegator }
+type (
+	closeNotifierDelegator struct{ *responseWriterDelegator }
+	flusherDelegator       struct{ *responseWriterDelegator }
+	hijackerDelegator      struct{ *responseWriterDelegator }
+	readerFromDelegator    struct{ *responseWriterDelegator }
+	pusherDelegator        struct{ *responseWriterDelegator }
+)
 
 func (d closeNotifierDelegator) CloseNotify() <-chan bool {
 	//nolint:staticcheck // Ignore SA1019. http.CloseNotifier is deprecated but we keep it here to not break existing users.
 	return d.ResponseWriter.(http.CloseNotifier).CloseNotify()
 }
+
 func (d flusherDelegator) Flush() {
 	// If applicable, call WriteHeader here so that observeWriteHeader is
 	// handled appropriately.
@@ -94,9 +97,11 @@ func (d flusherDelegator) Flush() {
 	}
 	d.ResponseWriter.(http.Flusher).Flush()
 }
+
 func (d hijackerDelegator) Hijack() (net.Conn, *bufio.ReadWriter, error) {
 	return d.ResponseWriter.(http.Hijacker).Hijack()
 }
+
 func (d readerFromDelegator) ReadFrom(re io.Reader) (int64, error) {
 	// If applicable, call WriteHeader here so that observeWriteHeader is
 	// handled appropriately.
@@ -107,6 +112,7 @@ func (d readerFromDelegator) ReadFrom(re io.Reader) (int64, error) {
 	d.written += n
 	return n, err
 }
+
 func (d pusherDelegator) Push(target string, opts *http.PushOptions) error {
 	return d.ResponseWriter.(http.Pusher).Push(target, opts)
 }
@@ -261,7 +267,7 @@ func init() {
 			http.Flusher
 		}{d, pusherDelegator{d}, hijackerDelegator{d}, flusherDelegator{d}}
 	}
-	pickDelegator[pusher+hijacker+flusher+closeNotifier] = func(d *responseWriterDelegator) delegator { //23
+	pickDelegator[pusher+hijacker+flusher+closeNotifier] = func(d *responseWriterDelegator) delegator { // 23
 		return struct {
 			*responseWriterDelegator
 			http.Pusher

prometheus/promhttp/http.go

@@ -33,6 +33,7 @@ package promhttp
 
 import (
 	"compress/gzip"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -42,7 +43,7 @@ import (
 
 	"github.com/prometheus/common/expfmt"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
 )
 
 const (
@@ -84,6 +85,13 @@ func Handler() http.Handler {
 // instrumentation. Use the InstrumentMetricHandler function to apply the same
 // kind of instrumentation as it is used by the Handler function.
 func HandlerFor(reg prometheus.Gatherer, opts HandlerOpts) http.Handler {
+	return HandlerForTransactional(prometheus.ToTransactionalGatherer(reg), opts)
+}
+
+// HandlerForTransactional is like HandlerFor, but it uses transactional gather, which
+// can safely change in-place returned *dto.MetricFamily before call to `Gather` and after
+// call to `done` of that `Gather`.
+func HandlerForTransactional(reg prometheus.TransactionalGatherer, opts HandlerOpts) http.Handler {
 	var (
 		inFlightSem chan struct{}
 		errCnt      = prometheus.NewCounterVec(
@@ -103,7 +111,8 @@ func HandlerFor(reg prometheus.Gatherer, opts HandlerOpts) http.Handler {
 		errCnt.WithLabelValues("gathering")
 		errCnt.WithLabelValues("encoding")
 		if err := opts.Registry.Register(errCnt); err != nil {
-			if are, ok := err.(prometheus.AlreadyRegisteredError); ok {
+			are := &prometheus.AlreadyRegisteredError{}
+			if errors.As(err, are) {
 				errCnt = are.ExistingCollector.(*prometheus.CounterVec)
 			} else {
 				panic(err)
@@ -123,7 +132,8 @@ func HandlerFor(reg prometheus.Gatherer, opts HandlerOpts) http.Handler {
 				return
 			}
 		}
-		mfs, err := reg.Gather()
+		mfs, done, err := reg.Gather()
+		defer done()
 		if err != nil {
 			if opts.ErrorLog != nil {
 				opts.ErrorLog.Println("error gathering metrics:", err)
@@ -242,7 +252,8 @@ func InstrumentMetricHandler(reg prometheus.Registerer, handler http.Handler) ht
 	cnt.WithLabelValues("500")
 	cnt.WithLabelValues("503")
 	if err := reg.Register(cnt); err != nil {
-		if are, ok := err.(prometheus.AlreadyRegisteredError); ok {
+		are := &prometheus.AlreadyRegisteredError{}
+		if errors.As(err, are) {
 			cnt = are.ExistingCollector.(*prometheus.CounterVec)
 		} else {
 			panic(err)
@@ -254,7 +265,8 @@ func InstrumentMetricHandler(reg prometheus.Registerer, handler http.Handler) ht
 		Help: "Current number of scrapes being served.",
 	})
 	if err := reg.Register(gge); err != nil {
-		if are, ok := err.(prometheus.AlreadyRegisteredError); ok {
+		are := &prometheus.AlreadyRegisteredError{}
+		if errors.As(err, are) {
 			gge = are.ExistingCollector.(prometheus.Gauge)
 		} else {
 			panic(err)

prometheus/promhttp/http_test.go

@@ -16,6 +16,7 @@ package promhttp
 import (
 	"bytes"
 	"errors"
+	"fmt"
 	"log"
 	"net/http"
 	"net/http/httptest"
@@ -23,7 +24,9 @@ import (
 	"testing"
 	"time"
 
-	"github.com/prometheus/client_golang/prometheus"
+	dto "github.com/prometheus/client_model/go"
+
+	"git.internal/re/client_golang/prometheus"
 )
 
 type errorCollector struct{}
@@ -56,8 +59,19 @@ func (b blockingCollector) Collect(ch chan<- prometheus.Metric) {
 	<-b.Block
 }
 
-func TestHandlerErrorHandling(t *testing.T) {
+type mockTransactionGatherer struct {
+	g             prometheus.Gatherer
+	gatherInvoked int
+	doneInvoked   int
+}
 
+func (g *mockTransactionGatherer) Gather() (_ []*dto.MetricFamily, done func(), err error) {
+	g.gatherInvoked++
+	mfs, err := g.g.Gather()
+	return mfs, func() { g.doneInvoked++ }, err
+}
+
+func TestHandlerErrorHandling(t *testing.T) {
 	// Create a registry that collects a MetricFamily with two elements,
 	// another with one, and reports an error. Further down, we'll use the
 	// same registry in the HandlerOpts.
@@ -90,21 +104,30 @@ func TestHandlerErrorHandling(t *testing.T) {
 	request, _ := http.NewRequest("GET", "/", nil)
 	request.Header.Add("Accept", "test/plain")
 
-	errorHandler := HandlerFor(reg, HandlerOpts{
+	mReg := &mockTransactionGatherer{g: reg}
+	errorHandler := HandlerForTransactional(mReg, HandlerOpts{
 		ErrorLog:      logger,
 		ErrorHandling: HTTPErrorOnError,
 		Registry:      reg,
 	})
-	continueHandler := HandlerFor(reg, HandlerOpts{
+	continueHandler := HandlerForTransactional(mReg, HandlerOpts{
 		ErrorLog:      logger,
 		ErrorHandling: ContinueOnError,
 		Registry:      reg,
 	})
-	panicHandler := HandlerFor(reg, HandlerOpts{
+	panicHandler := HandlerForTransactional(mReg, HandlerOpts{
 		ErrorLog:      logger,
 		ErrorHandling: PanicOnError,
 		Registry:      reg,
 	})
+	// Expect gatherer not touched.
+	if got := mReg.gatherInvoked; got != 0 {
+		t.Fatalf("unexpected number of gather invokes, want 0, got %d", got)
+	}
+	if got := mReg.doneInvoked; got != 0 {
+		t.Fatalf("unexpected number of done invokes, want 0, got %d", got)
+	}
+
 	wantMsg := `error gathering metrics: error collecting metric Desc{fqName: "invalid_metric", help: "not helpful", constLabels: {}, variableLabels: []}: collect error
 `
 	wantErrorBody := `An error has occurred while serving metrics:
@@ -140,25 +163,39 @@ the_count 0
 `
 
 	errorHandler.ServeHTTP(writer, request)
+	if got := mReg.gatherInvoked; got != 1 {
+		t.Fatalf("unexpected number of gather invokes, want 1, got %d", got)
+	}
+	if got := mReg.doneInvoked; got != 1 {
+		t.Fatalf("unexpected number of done invokes, want 1, got %d", got)
+	}
 	if got, want := writer.Code, http.StatusInternalServerError; got != want {
 		t.Errorf("got HTTP status code %d, want %d", got, want)
 	}
-	if got := logBuf.String(); got != wantMsg {
-		t.Errorf("got log message:\n%s\nwant log message:\n%s\n", got, wantMsg)
+	if got, want := logBuf.String(), wantMsg; got != want {
+		t.Errorf("got log buf %q, want %q", got, want)
 	}
-	if got := writer.Body.String(); got != wantErrorBody {
-		t.Errorf("got body:\n%s\nwant body:\n%s\n", got, wantErrorBody)
+	if got, want := writer.Body.String(), wantErrorBody; got != want {
+		t.Errorf("got body %q, want %q", got, want)
 	}
+
 	logBuf.Reset()
 	writer.Body.Reset()
 	writer.Code = http.StatusOK
 
 	continueHandler.ServeHTTP(writer, request)
+
+	if got := mReg.gatherInvoked; got != 2 {
+		t.Fatalf("unexpected number of gather invokes, want 2, got %d", got)
+	}
+	if got := mReg.doneInvoked; got != 2 {
+		t.Fatalf("unexpected number of done invokes, want 2, got %d", got)
+	}
 	if got, want := writer.Code, http.StatusOK; got != want {
 		t.Errorf("got HTTP status code %d, want %d", got, want)
 	}
-	if got := logBuf.String(); got != wantMsg {
-		t.Errorf("got log message %q, want %q", got, wantMsg)
+	if got, want := logBuf.String(), wantMsg; got != want {
+		t.Errorf("got log buf %q, want %q", got, want)
 	}
 	if got := writer.Body.String(); got != wantOKBody1 && got != wantOKBody2 {
 		t.Errorf("got body %q, want either %q or %q", got, wantOKBody1, wantOKBody2)
@@ -168,20 +205,34 @@ the_count 0
 		if err := recover(); err == nil {
 			t.Error("expected panic from panicHandler")
 		}
+		if got := mReg.gatherInvoked; got != 3 {
+			t.Fatalf("unexpected number of gather invokes, want 3, got %d", got)
+		}
+		if got := mReg.doneInvoked; got != 3 {
+			t.Fatalf("unexpected number of done invokes, want 3, got %d", got)
+		}
 	}()
 	panicHandler.ServeHTTP(writer, request)
 }
 
 func TestInstrumentMetricHandler(t *testing.T) {
 	reg := prometheus.NewRegistry()
-	handler := InstrumentMetricHandler(reg, HandlerFor(reg, HandlerOpts{}))
+	mReg := &mockTransactionGatherer{g: reg}
+	handler := InstrumentMetricHandler(reg, HandlerForTransactional(mReg, HandlerOpts{}))
 	// Do it again to test idempotency.
-	InstrumentMetricHandler(reg, HandlerFor(reg, HandlerOpts{}))
+	InstrumentMetricHandler(reg, HandlerForTransactional(mReg, HandlerOpts{}))
 	writer := httptest.NewRecorder()
 	request, _ := http.NewRequest("GET", "/", nil)
 	request.Header.Add("Accept", "test/plain")
 
 	handler.ServeHTTP(writer, request)
+	if got := mReg.gatherInvoked; got != 1 {
+		t.Fatalf("unexpected number of gather invokes, want 1, got %d", got)
+	}
+	if got := mReg.doneInvoked; got != 1 {
+		t.Fatalf("unexpected number of done invokes, want 1, got %d", got)
+	}
+
 	if got, want := writer.Code, http.StatusOK; got != want {
 		t.Errorf("got HTTP status code %d, want %d", got, want)
 	}
@@ -195,19 +246,28 @@ func TestInstrumentMetricHandler(t *testing.T) {
 		t.Errorf("got body %q, does not contain %q", got, want)
 	}
 
-	writer.Body.Reset()
-	handler.ServeHTTP(writer, request)
-	if got, want := writer.Code, http.StatusOK; got != want {
-		t.Errorf("got HTTP status code %d, want %d", got, want)
-	}
+	for i := 0; i < 100; i++ {
+		writer.Body.Reset()
+		handler.ServeHTTP(writer, request)
 
-	want = "promhttp_metric_handler_requests_in_flight 1\n"
-	if got := writer.Body.String(); !strings.Contains(got, want) {
-		t.Errorf("got body %q, does not contain %q", got, want)
-	}
-	want = "promhttp_metric_handler_requests_total{code=\"200\"} 1\n"
-	if got := writer.Body.String(); !strings.Contains(got, want) {
-		t.Errorf("got body %q, does not contain %q", got, want)
+		if got, want := mReg.gatherInvoked, i+2; got != want {
+			t.Fatalf("unexpected number of gather invokes, want %d, got %d", want, got)
+		}
+		if got, want := mReg.doneInvoked, i+2; got != want {
+			t.Fatalf("unexpected number of done invokes, want %d, got %d", want, got)
+		}
+		if got, want := writer.Code, http.StatusOK; got != want {
+			t.Errorf("got HTTP status code %d, want %d", got, want)
+		}
+
+		want := "promhttp_metric_handler_requests_in_flight 1\n"
+		if got := writer.Body.String(); !strings.Contains(got, want) {
+			t.Errorf("got body %q, does not contain %q", got, want)
+		}
+		want = fmt.Sprintf("promhttp_metric_handler_requests_total{code=\"200\"} %d\n", i+1)
+		if got := writer.Body.String(); !strings.Contains(got, want) {
+			t.Errorf("got body %q, does not contain %q", got, want)
+		}
 	}
 }
 

prometheus/promhttp/instrument_client.go

@@ -19,7 +19,7 @@ import (
 	"net/http/httptrace"
 	"time"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
 )
 
 // The RoundTripperFunc type is an adapter to allow the use of ordinary
@@ -38,42 +38,59 @@ func (rt RoundTripperFunc) RoundTrip(r *http.Request) (*http.Response, error) {
 //
 // See the example for ExampleInstrumentRoundTripperDuration for example usage.
 func InstrumentRoundTripperInFlight(gauge prometheus.Gauge, next http.RoundTripper) RoundTripperFunc {
-	return RoundTripperFunc(func(r *http.Request) (*http.Response, error) {
+	return func(r *http.Request) (*http.Response, error) {
 		gauge.Inc()
 		defer gauge.Dec()
 		return next.RoundTrip(r)
-	})
+	}
 }
 
 // InstrumentRoundTripperCounter is a middleware that wraps the provided
 // http.RoundTripper to observe the request result with the provided CounterVec.
 // The CounterVec must have zero, one, or two non-const non-curried labels. For
 // those, the only allowed label names are "code" and "method". The function
-// panics otherwise. Partitioning of the CounterVec happens by HTTP status code
+// panics otherwise. For the "method" label a predefined default label value set
+// is used to filter given values. Values besides predefined values will count
+// as `unknown` method.`WithExtraMethods` can be used to add more
+// methods to the set. Partitioning of the CounterVec happens by HTTP status code
 // and/or HTTP method if the respective instance label names are present in the
 // CounterVec. For unpartitioned counting, use a CounterVec with zero labels.
 //
 // If the wrapped RoundTripper panics or returns a non-nil error, the Counter
 // is not incremented.
 //
+// Use with WithExemplarFromContext to instrument the exemplars on the counter of requests.
+//
 // See the example for ExampleInstrumentRoundTripperDuration for example usage.
-func InstrumentRoundTripperCounter(counter *prometheus.CounterVec, next http.RoundTripper) RoundTripperFunc {
+func InstrumentRoundTripperCounter(counter *prometheus.CounterVec, next http.RoundTripper, opts ...Option) RoundTripperFunc {
+	rtOpts := defaultOptions()
+	for _, o := range opts {
+		o.apply(rtOpts)
+	}
+
 	code, method := checkLabels(counter)
 
-	return RoundTripperFunc(func(r *http.Request) (*http.Response, error) {
+	return func(r *http.Request) (*http.Response, error) {
 		resp, err := next.RoundTrip(r)
 		if err == nil {
-			counter.With(labels(code, method, r.Method, resp.StatusCode)).Inc()
+			addWithExemplar(
+				counter.With(labels(code, method, r.Method, resp.StatusCode, rtOpts.extraMethods...)),
+				1,
+				rtOpts.getExemplarFn(r.Context()),
+			)
 		}
 		return resp, err
-	})
+	}
 }
 
 // InstrumentRoundTripperDuration is a middleware that wraps the provided
 // http.RoundTripper to observe the request duration with the provided
 // ObserverVec.  The ObserverVec must have zero, one, or two non-const
 // non-curried labels. For those, the only allowed label names are "code" and
-// "method". The function panics otherwise. The Observe method of the Observer
+// "method". The function panics otherwise. For the "method" label a predefined
+// default label value set is used to filter given values. Values besides
+// predefined values will count as `unknown` method. `WithExtraMethods`
+// can be used to add more methods to the set. The Observe method of the Observer
 // in the ObserverVec is called with the request duration in
 // seconds. Partitioning happens by HTTP status code and/or HTTP method if the
 // respective instance label names are present in the ObserverVec. For
@@ -83,19 +100,30 @@ func InstrumentRoundTripperCounter(counter *prometheus.CounterVec, next http.Rou
 // If the wrapped RoundTripper panics or returns a non-nil error, no values are
 // reported.
 //
+// Use with WithExemplarFromContext to instrument the exemplars on the duration histograms.
+//
 // Note that this method is only guaranteed to never observe negative durations
 // if used with Go1.9+.
-func InstrumentRoundTripperDuration(obs prometheus.ObserverVec, next http.RoundTripper) RoundTripperFunc {
+func InstrumentRoundTripperDuration(obs prometheus.ObserverVec, next http.RoundTripper, opts ...Option) RoundTripperFunc {
+	rtOpts := defaultOptions()
+	for _, o := range opts {
+		o.apply(rtOpts)
+	}
+
 	code, method := checkLabels(obs)
 
-	return RoundTripperFunc(func(r *http.Request) (*http.Response, error) {
+	return func(r *http.Request) (*http.Response, error) {
 		start := time.Now()
 		resp, err := next.RoundTrip(r)
 		if err == nil {
-			obs.With(labels(code, method, r.Method, resp.StatusCode)).Observe(time.Since(start).Seconds())
+			observeWithExemplar(
+				obs.With(labels(code, method, r.Method, resp.StatusCode, rtOpts.extraMethods...)),
+				time.Since(start).Seconds(),
+				rtOpts.getExemplarFn(r.Context()),
+			)
 		}
 		return resp, err
-	})
+	}
 }
 
 // InstrumentTrace is used to offer flexibility in instrumenting the available
@@ -133,7 +161,7 @@ type InstrumentTrace struct {
 //
 // See the example for ExampleInstrumentRoundTripperDuration for example usage.
 func InstrumentRoundTripperTrace(it *InstrumentTrace, next http.RoundTripper) RoundTripperFunc {
-	return RoundTripperFunc(func(r *http.Request) (*http.Response, error) {
+	return func(r *http.Request) (*http.Response, error) {
 		start := time.Now()
 
 		trace := &httptrace.ClientTrace{
@@ -215,5 +243,5 @@ func InstrumentRoundTripperTrace(it *InstrumentTrace, next http.RoundTripper) Ro
 		r = r.WithContext(httptrace.WithClientTrace(r.Context(), trace))
 
 		return next.RoundTrip(r)
-	})
+	}
 }

prometheus/promhttp/instrument_client_test.go

@@ -18,14 +18,20 @@ import (
 	"log"
 	"net/http"
 	"net/http/httptest"
+	"reflect"
+	"sort"
 	"strings"
 	"testing"
 	"time"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus/testutil"
+
+	dto "github.com/prometheus/client_model/go"
+	"google.golang.org/protobuf/proto"
 )
 
-func makeInstrumentedClient() (*http.Client, *prometheus.Registry) {
+func makeInstrumentedClient(opts ...Option) (*http.Client, *prometheus.Registry) {
 	client := http.DefaultClient
 	client.Timeout = 1 * time.Second
 
@@ -91,13 +97,91 @@ func makeInstrumentedClient() (*http.Client, *prometheus.Registry) {
 	client.Transport = InstrumentRoundTripperInFlight(inFlightGauge,
 		InstrumentRoundTripperCounter(counter,
 			InstrumentRoundTripperTrace(trace,
-				InstrumentRoundTripperDuration(histVec, http.DefaultTransport),
+				InstrumentRoundTripperDuration(histVec, http.DefaultTransport, opts...),
 			),
-		),
+			opts...),
 	)
 	return client, reg
 }
 
+func labelsToLabelPair(l prometheus.Labels) []*dto.LabelPair {
+	ret := make([]*dto.LabelPair, 0, len(l))
+	for k, v := range l {
+		ret = append(ret, &dto.LabelPair{Name: proto.String(k), Value: proto.String(v)})
+	}
+	sort.Slice(ret, func(i, j int) bool {
+		return *ret[i].Name < *ret[j].Name
+	})
+	return ret
+}
+
+func assetMetricAndExemplars(
+	t *testing.T,
+	reg *prometheus.Registry,
+	expectedNumMetrics int,
+	expectedExemplar []*dto.LabelPair,
+) {
+	t.Helper()
+
+	mfs, err := reg.Gather()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if want, got := expectedNumMetrics, len(mfs); want != got {
+		t.Fatalf("unexpected number of metric families gathered, want %d, got %d", want, got)
+	}
+
+	for _, mf := range mfs {
+		if len(mf.Metric) == 0 {
+			t.Errorf("metric family %s must not be empty", mf.GetName())
+		}
+		for _, m := range mf.GetMetric() {
+			if c := m.GetCounter(); c != nil {
+				if len(expectedExemplar) == 0 {
+					if c.Exemplar != nil {
+						t.Errorf("expected no exemplar on the counter %v%v, got %v", mf.GetName(), m.Label, c.Exemplar.String())
+					}
+					continue
+				}
+
+				if c.Exemplar == nil {
+					t.Errorf("expected exemplar %v on the counter %v%v, got none", expectedExemplar, mf.GetName(), m.Label)
+					continue
+				}
+				if got := c.Exemplar.Label; !reflect.DeepEqual(expectedExemplar, got) {
+					t.Errorf("expected exemplar %v on the counter %v%v, got %v", expectedExemplar, mf.GetName(), m.Label, got)
+				}
+				continue
+			}
+			if h := m.GetHistogram(); h != nil {
+				found := false
+				for _, b := range h.GetBucket() {
+					if len(expectedExemplar) == 0 {
+						if b.Exemplar != nil {
+							t.Errorf("expected no exemplar on histogram %v%v bkt %v, got %v", mf.GetName(), m.Label, b.GetUpperBound(), b.Exemplar.String())
+						}
+						continue
+					}
+
+					if b.Exemplar == nil {
+						continue
+					}
+					if got := b.Exemplar.Label; !reflect.DeepEqual(expectedExemplar, got) {
+						t.Errorf("expected exemplar %v on the histogram %v%v on bkt %v, got %v", expectedExemplar, mf.GetName(), m.Label, b.GetUpperBound(), got)
+						continue
+					}
+					found = true
+					break
+				}
+
+				if len(expectedExemplar) > 0 && !found {
+					t.Errorf("expected exemplar %v on at least one bucket of the histogram %v%v, got none", expectedExemplar, mf.GetName(), m.Label)
+				}
+			}
+		}
+	}
+}
+
 func TestClientMiddlewareAPI(t *testing.T) {
 	client, reg := makeInstrumentedClient()
 	backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@@ -111,21 +195,28 @@ func TestClientMiddlewareAPI(t *testing.T) {
 	}
 	defer resp.Body.Close()
 
-	mfs, err := reg.Gather()
+	assetMetricAndExemplars(t, reg, 3, nil)
+}
+
+func TestClientMiddlewareAPI_WithExemplars(t *testing.T) {
+	exemplar := prometheus.Labels{"traceID": "example situation observed by this metric"}
+
+	client, reg := makeInstrumentedClient(WithExemplarFromContext(func(_ context.Context) prometheus.Labels { return exemplar }))
+	backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	}))
+	defer backend.Close()
+
+	resp, err := client.Get(backend.URL)
 	if err != nil {
 		t.Fatal(err)
 	}
-	if want, got := 3, len(mfs); want != got {
-		t.Fatalf("unexpected number of metric families gathered, want %d, got %d", want, got)
-	}
-	for _, mf := range mfs {
-		if len(mf.Metric) == 0 {
-			t.Errorf("metric family %s must not be empty", mf.GetName())
-		}
-	}
+	defer resp.Body.Close()
+
+	assetMetricAndExemplars(t, reg, 3, labelsToLabelPair(exemplar))
 }
 
-func TestClientMiddlewareAPIWithRequestContext(t *testing.T) {
+func TestClientMiddlewareAPI_WithRequestContext(t *testing.T) {
 	client, reg := makeInstrumentedClient()
 	backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusOK)
@@ -160,6 +251,19 @@ func TestClientMiddlewareAPIWithRequestContext(t *testing.T) {
 			t.Errorf("metric family %s must not be empty", mf.GetName())
 		}
 	}
+
+	// make sure counters aren't double-incremented (see #1117)
+	expected := `
+		# HELP client_api_requests_total A counter for requests from the wrapped client.
+		# TYPE client_api_requests_total counter
+		client_api_requests_total{code="200",method="get"} 1
+	`
+
+	if err := testutil.GatherAndCompare(reg, strings.NewReader(expected),
+		"client_api_requests_total",
+	); err != nil {
+		t.Fatal(err)
+	}
 }
 
 func TestClientMiddlewareAPIWithRequestContextTimeout(t *testing.T) {

prometheus/promhttp/instrument_server.go

@@ -22,12 +22,32 @@ import (
 
 	dto "github.com/prometheus/client_model/go"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
 )
 
 // magicString is used for the hacky label test in checkLabels. Remove once fixed.
 const magicString = "zZgWfBxLqvG8kc8IMv3POi2Bb0tZI3vAnBx+gBaFi9FyPzB/CzKUer1yufDa"
 
+// observeWithExemplar is a wrapper for [prometheus.ExemplarAdder.ExemplarObserver],
+// which falls back to [prometheus.Observer.Observe] if no labels are provided.
+func observeWithExemplar(obs prometheus.Observer, val float64, labels map[string]string) {
+	if labels == nil {
+		obs.Observe(val)
+		return
+	}
+	obs.(prometheus.ExemplarObserver).ObserveWithExemplar(val, labels)
+}
+
+// addWithExemplar is a wrapper for [prometheus.ExemplarAdder.AddWithExemplar],
+// which falls back to [prometheus.Counter.Add] if no labels are provided.
+func addWithExemplar(obs prometheus.Counter, val float64, labels map[string]string) {
+	if labels == nil {
+		obs.Add(val)
+		return
+	}
+	obs.(prometheus.ExemplarAdder).AddWithExemplar(val, labels)
+}
+
 // InstrumentHandlerInFlight is a middleware that wraps the provided
 // http.Handler. It sets the provided prometheus.Gauge to the number of
 // requests currently handled by the wrapped http.Handler.
@@ -45,7 +65,10 @@ func InstrumentHandlerInFlight(g prometheus.Gauge, next http.Handler) http.Handl
 // http.Handler to observe the request duration with the provided ObserverVec.
 // The ObserverVec must have valid metric and label names and must have zero,
 // one, or two non-const non-curried labels. For those, the only allowed label
-// names are "code" and "method". The function panics otherwise. The Observe
+// names are "code" and "method". The function panics otherwise. For the "method"
+// label a predefined default label value set is used to filter given values.
+// Values besides predefined values will count as `unknown` method.
+// `WithExtraMethods` can be used to add more methods to the set. The Observe
 // method of the Observer in the ObserverVec is called with the request duration
 // in seconds. Partitioning happens by HTTP status code and/or HTTP method if
 // the respective instance label names are present in the ObserverVec. For
@@ -58,31 +81,48 @@ func InstrumentHandlerInFlight(g prometheus.Gauge, next http.Handler) http.Handl
 //
 // Note that this method is only guaranteed to never observe negative durations
 // if used with Go1.9+.
-func InstrumentHandlerDuration(obs prometheus.ObserverVec, next http.Handler) http.HandlerFunc {
+func InstrumentHandlerDuration(obs prometheus.ObserverVec, next http.Handler, opts ...Option) http.HandlerFunc {
+	hOpts := defaultOptions()
+	for _, o := range opts {
+		o.apply(hOpts)
+	}
+
 	code, method := checkLabels(obs)
 
 	if code {
-		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		return func(w http.ResponseWriter, r *http.Request) {
 			now := time.Now()
 			d := newDelegator(w, nil)
 			next.ServeHTTP(d, r)
 
-			obs.With(labels(code, method, r.Method, d.Status())).Observe(time.Since(now).Seconds())
-		})
+			observeWithExemplar(
+				obs.With(labels(code, method, r.Method, d.Status(), hOpts.extraMethods...)),
+				time.Since(now).Seconds(),
+				hOpts.getExemplarFn(r.Context()),
+			)
+		}
 	}
 
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
 		now := time.Now()
 		next.ServeHTTP(w, r)
-		obs.With(labels(code, method, r.Method, 0)).Observe(time.Since(now).Seconds())
-	})
+
+		observeWithExemplar(
+			obs.With(labels(code, method, r.Method, 0, hOpts.extraMethods...)),
+			time.Since(now).Seconds(),
+			hOpts.getExemplarFn(r.Context()),
+		)
+	}
 }
 
 // InstrumentHandlerCounter is a middleware that wraps the provided http.Handler
 // to observe the request result with the provided CounterVec. The CounterVec
 // must have valid metric and label names and must have zero, one, or two
 // non-const non-curried labels. For those, the only allowed label names are
-// "code" and "method". The function panics otherwise. Partitioning of the
+// "code" and "method". The function panics otherwise. For the "method"
+// label a predefined default label value set is used to filter given values.
+// Values besides predefined values will count as `unknown` method.
+// `WithExtraMethods` can be used to add more methods to the set. Partitioning of the
 // CounterVec happens by HTTP status code and/or HTTP method if the respective
 // instance label names are present in the CounterVec. For unpartitioned
 // counting, use a CounterVec with zero labels.
@@ -92,21 +132,35 @@ func InstrumentHandlerDuration(obs prometheus.ObserverVec, next http.Handler) ht
 // If the wrapped Handler panics, the Counter is not incremented.
 //
 // See the example for InstrumentHandlerDuration for example usage.
-func InstrumentHandlerCounter(counter *prometheus.CounterVec, next http.Handler) http.HandlerFunc {
+func InstrumentHandlerCounter(counter *prometheus.CounterVec, next http.Handler, opts ...Option) http.HandlerFunc {
+	hOpts := defaultOptions()
+	for _, o := range opts {
+		o.apply(hOpts)
+	}
+
 	code, method := checkLabels(counter)
 
 	if code {
-		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		return func(w http.ResponseWriter, r *http.Request) {
 			d := newDelegator(w, nil)
 			next.ServeHTTP(d, r)
-			counter.With(labels(code, method, r.Method, d.Status())).Inc()
-		})
+
+			addWithExemplar(
+				counter.With(labels(code, method, r.Method, d.Status(), hOpts.extraMethods...)),
+				1,
+				hOpts.getExemplarFn(r.Context()),
+			)
+		}
 	}
 
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
 		next.ServeHTTP(w, r)
-		counter.With(labels(code, method, r.Method, 0)).Inc()
-	})
+		addWithExemplar(
+			counter.With(labels(code, method, r.Method, 0, hOpts.extraMethods...)),
+			1,
+			hOpts.getExemplarFn(r.Context()),
+		)
+	}
 }
 
 // InstrumentHandlerTimeToWriteHeader is a middleware that wraps the provided
@@ -114,7 +168,10 @@ func InstrumentHandlerCounter(counter *prometheus.CounterVec, next http.Handler)
 // until the response headers are written. The ObserverVec must have valid
 // metric and label names and must have zero, one, or two non-const non-curried
 // labels. For those, the only allowed label names are "code" and "method". The
-// function panics otherwise. The Observe method of the Observer in the
+// function panics otherwise. For the "method" label a predefined default label
+// value set is used to filter given values. Values besides predefined values
+// will count as `unknown` method.`WithExtraMethods` can be used to add more
+// methods to the set. The Observe method of the Observer in the
 // ObserverVec is called with the request duration in seconds. Partitioning
 // happens by HTTP status code and/or HTTP method if the respective instance
 // label names are present in the ObserverVec. For unpartitioned observations,
@@ -128,24 +185,36 @@ func InstrumentHandlerCounter(counter *prometheus.CounterVec, next http.Handler)
 // if used with Go1.9+.
 //
 // See the example for InstrumentHandlerDuration for example usage.
-func InstrumentHandlerTimeToWriteHeader(obs prometheus.ObserverVec, next http.Handler) http.HandlerFunc {
+func InstrumentHandlerTimeToWriteHeader(obs prometheus.ObserverVec, next http.Handler, opts ...Option) http.HandlerFunc {
+	hOpts := defaultOptions()
+	for _, o := range opts {
+		o.apply(hOpts)
+	}
+
 	code, method := checkLabels(obs)
 
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
 		now := time.Now()
 		d := newDelegator(w, func(status int) {
-			obs.With(labels(code, method, r.Method, status)).Observe(time.Since(now).Seconds())
+			observeWithExemplar(
+				obs.With(labels(code, method, r.Method, status, hOpts.extraMethods...)),
+				time.Since(now).Seconds(),
+				hOpts.getExemplarFn(r.Context()),
+			)
 		})
 		next.ServeHTTP(d, r)
-	})
+	}
 }
 
 // InstrumentHandlerRequestSize is a middleware that wraps the provided
 // http.Handler to observe the request size with the provided ObserverVec. The
 // ObserverVec must have valid metric and label names and must have zero, one,
 // or two non-const non-curried labels. For those, the only allowed label names
-// are "code" and "method". The function panics otherwise. The Observe method of
-// the Observer in the ObserverVec is called with the request size in
+// are "code" and "method". The function panics otherwise. For the "method"
+// label a predefined default label value set is used to filter given values.
+// Values besides predefined values will count as `unknown` method.
+// `WithExtraMethods` can be used to add more methods to the set. The Observe
+// method of the Observer in the ObserverVec is called with the request size in
 // bytes. Partitioning happens by HTTP status code and/or HTTP method if the
 // respective instance label names are present in the ObserverVec. For
 // unpartitioned observations, use an ObserverVec with zero labels. Note that
@@ -156,31 +225,46 @@ func InstrumentHandlerTimeToWriteHeader(obs prometheus.ObserverVec, next http.Ha
 // If the wrapped Handler panics, no values are reported.
 //
 // See the example for InstrumentHandlerDuration for example usage.
-func InstrumentHandlerRequestSize(obs prometheus.ObserverVec, next http.Handler) http.HandlerFunc {
-	code, method := checkLabels(obs)
+func InstrumentHandlerRequestSize(obs prometheus.ObserverVec, next http.Handler, opts ...Option) http.HandlerFunc {
+	hOpts := defaultOptions()
+	for _, o := range opts {
+		o.apply(hOpts)
+	}
 
+	code, method := checkLabels(obs)
 	if code {
-		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		return func(w http.ResponseWriter, r *http.Request) {
 			d := newDelegator(w, nil)
 			next.ServeHTTP(d, r)
 			size := computeApproximateRequestSize(r)
-			obs.With(labels(code, method, r.Method, d.Status())).Observe(float64(size))
-		})
+			observeWithExemplar(
+				obs.With(labels(code, method, r.Method, d.Status(), hOpts.extraMethods...)),
+				float64(size),
+				hOpts.getExemplarFn(r.Context()),
+			)
+		}
 	}
 
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
 		next.ServeHTTP(w, r)
 		size := computeApproximateRequestSize(r)
-		obs.With(labels(code, method, r.Method, 0)).Observe(float64(size))
-	})
+		observeWithExemplar(
+			obs.With(labels(code, method, r.Method, 0, hOpts.extraMethods...)),
+			float64(size),
+			hOpts.getExemplarFn(r.Context()),
+		)
+	}
 }
 
 // InstrumentHandlerResponseSize is a middleware that wraps the provided
 // http.Handler to observe the response size with the provided ObserverVec. The
 // ObserverVec must have valid metric and label names and must have zero, one,
 // or two non-const non-curried labels. For those, the only allowed label names
-// are "code" and "method". The function panics otherwise. The Observe method of
-// the Observer in the ObserverVec is called with the response size in
+// are "code" and "method". The function panics otherwise. For the "method"
+// label a predefined default label value set is used to filter given values.
+// Values besides predefined values will count as `unknown` method.
+// `WithExtraMethods` can be used to add more methods to the set. The Observe
+// method of the Observer in the ObserverVec is called with the response size in
 // bytes. Partitioning happens by HTTP status code and/or HTTP method if the
 // respective instance label names are present in the ObserverVec. For
 // unpartitioned observations, use an ObserverVec with zero labels. Note that
@@ -191,12 +275,22 @@ func InstrumentHandlerRequestSize(obs prometheus.ObserverVec, next http.Handler)
 // If the wrapped Handler panics, no values are reported.
 //
 // See the example for InstrumentHandlerDuration for example usage.
-func InstrumentHandlerResponseSize(obs prometheus.ObserverVec, next http.Handler) http.Handler {
+func InstrumentHandlerResponseSize(obs prometheus.ObserverVec, next http.Handler, opts ...Option) http.Handler {
+	hOpts := defaultOptions()
+	for _, o := range opts {
+		o.apply(hOpts)
+	}
+
 	code, method := checkLabels(obs)
+
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		d := newDelegator(w, nil)
 		next.ServeHTTP(d, r)
-		obs.With(labels(code, method, r.Method, d.Status())).Observe(float64(d.Written()))
+		observeWithExemplar(
+			obs.With(labels(code, method, r.Method, d.Status(), hOpts.extraMethods...)),
+			float64(d.Written()),
+			hOpts.getExemplarFn(r.Context()),
+		)
 	})
 }
 
@@ -205,7 +299,7 @@ func InstrumentHandlerResponseSize(obs prometheus.ObserverVec, next http.Handler
 // Collector does not have a Desc or has more than one Desc or its Desc is
 // invalid. It also panics if the Collector has any non-const, non-curried
 // labels that are not named "code" or "method".
-func checkLabels(c prometheus.Collector) (code bool, method bool) {
+func checkLabels(c prometheus.Collector) (code, method bool) {
 	// TODO(beorn7): Remove this hacky way to check for instance labels
 	// once Descriptors can have their dimensionality queried.
 	var (
@@ -290,7 +384,7 @@ func isLabelCurried(c prometheus.Collector, label string) bool {
 // unnecessary allocations on each request.
 var emptyLabels = prometheus.Labels{}
 
-func labels(code, method bool, reqMethod string, status int) prometheus.Labels {
+func labels(code, method bool, reqMethod string, status int, extraMethods ...string) prometheus.Labels {
 	if !(code || method) {
 		return emptyLabels
 	}
@@ -300,7 +394,7 @@ func labels(code, method bool, reqMethod string, status int) prometheus.Labels {
 		labels["code"] = sanitizeCode(status)
 	}
 	if method {
-		labels["method"] = sanitizeMethod(reqMethod)
+		labels["method"] = sanitizeMethod(reqMethod, extraMethods...)
 	}
 
 	return labels
@@ -330,7 +424,12 @@ func computeApproximateRequestSize(r *http.Request) int {
 	return s
 }
 
-func sanitizeMethod(m string) string {
+// If the wrapped http.Handler has a known method, it will be sanitized and returned.
+// Otherwise, "unknown" will be returned. The known method list can be extended
+// as needed by using extraMethods parameter.
+func sanitizeMethod(m string, extraMethods ...string) string {
+	// See https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods for
+	// the methods chosen as default.
 	switch m {
 	case "GET", "get":
 		return "get"
@@ -348,15 +447,25 @@ func sanitizeMethod(m string) string {
 		return "options"
 	case "NOTIFY", "notify":
 		return "notify"
+	case "TRACE", "trace":
+		return "trace"
+	case "PATCH", "patch":
+		return "patch"
 	default:
-		return strings.ToLower(m)
+		for _, method := range extraMethods {
+			if strings.EqualFold(m, method) {
+				return strings.ToLower(m)
+			}
+		}
+		return "unknown"
 	}
 }
 
 // If the wrapped http.Handler has not set a status code, i.e. the value is
-// currently 0, santizeCode will return 200, for consistency with behavior in
+// currently 0, sanitizeCode will return 200, for consistency with behavior in
 // the stdlib.
 func sanitizeCode(s int) string {
+	// See for accepted codes https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
 	switch s {
 	case 100:
 		return "100"
@@ -453,6 +562,9 @@ func sanitizeCode(s int) string {
 		return "511"
 
 	default:
-		return strconv.Itoa(s)
+		if s >= 100 && s <= 599 {
+			return strconv.Itoa(s)
+		}
+		return "unknown"
 	}
 }

prometheus/promhttp/instrument_server_test.go

@@ -14,13 +14,14 @@
 package promhttp
 
 import (
+	"context"
 	"io"
 	"log"
 	"net/http"
 	"net/http/httptest"
 	"testing"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"git.internal/re/client_golang/prometheus"
 )
 
 func TestLabelCheck(t *testing.T) {
@@ -204,7 +205,123 @@ func TestLabelCheck(t *testing.T) {
 	}
 }
 
-func TestMiddlewareAPI(t *testing.T) {
+func TestLabels(t *testing.T) {
+	scenarios := map[string]struct {
+		varLabels    []string
+		reqMethod    string
+		respStatus   int
+		extraMethods []string
+		wantLabels   prometheus.Labels
+		ok           bool
+	}{
+		"empty": {
+			varLabels:  []string{},
+			wantLabels: emptyLabels,
+			reqMethod:  "GET",
+			respStatus: 200,
+			ok:         true,
+		},
+		"code as single var label": {
+			varLabels:  []string{"code"},
+			reqMethod:  "GET",
+			respStatus: 200,
+			wantLabels: prometheus.Labels{"code": "200"},
+			ok:         true,
+		},
+		"code as single var label and out-of-range code": {
+			varLabels:  []string{"code"},
+			reqMethod:  "GET",
+			respStatus: 99,
+			wantLabels: prometheus.Labels{"code": "unknown"},
+			ok:         true,
+		},
+		"code as single var label and in-range but unrecognized code": {
+			varLabels:  []string{"code"},
+			reqMethod:  "GET",
+			respStatus: 308,
+			wantLabels: prometheus.Labels{"code": "308"},
+			ok:         true,
+		},
+		"method as single var label": {
+			varLabels:  []string{"method"},
+			reqMethod:  "GET",
+			respStatus: 200,
+			wantLabels: prometheus.Labels{"method": "get"},
+			ok:         true,
+		},
+		"method as single var label and unknown method": {
+			varLabels:  []string{"method"},
+			reqMethod:  "CUSTOM_METHOD",
+			respStatus: 200,
+			wantLabels: prometheus.Labels{"method": "unknown"},
+			ok:         true,
+		},
+		"code and method as var labels": {
+			varLabels:  []string{"method", "code"},
+			reqMethod:  "GET",
+			respStatus: 200,
+			wantLabels: prometheus.Labels{"method": "get", "code": "200"},
+			ok:         true,
+		},
+		"method as single var label with extra methods specified": {
+			varLabels:    []string{"method"},
+			reqMethod:    "CUSTOM_METHOD",
+			respStatus:   200,
+			extraMethods: []string{"CUSTOM_METHOD", "CUSTOM_METHOD_1"},
+			wantLabels:   prometheus.Labels{"method": "custom_method"},
+			ok:           true,
+		},
+		"all labels used with an unknown method and out-of-range code": {
+			varLabels:  []string{"code", "method"},
+			reqMethod:  "CUSTOM_METHOD",
+			respStatus: 99,
+			wantLabels: prometheus.Labels{"method": "unknown", "code": "unknown"},
+			ok:         false,
+		},
+	}
+	checkLabels := func(labels []string) (gotCode, gotMethod bool) {
+		for _, label := range labels {
+			switch label {
+			case "code":
+				gotCode = true
+			case "method":
+				gotMethod = true
+			default:
+				panic("metric partitioned with non-supported labels for this test")
+			}
+		}
+		return
+	}
+	equalLabels := func(gotLabels, wantLabels prometheus.Labels) bool {
+		if len(gotLabels) != len(wantLabels) {
+			return false
+		}
+		for ln, lv := range gotLabels {
+			olv, ok := wantLabels[ln]
+			if !ok {
+				return false
+			}
+			if olv != lv {
+				return false
+			}
+		}
+		return true
+	}
+
+	for name, sc := range scenarios {
+		t.Run(name, func(t *testing.T) {
+			if sc.ok {
+				gotCode, gotMethod := checkLabels(sc.varLabels)
+				gotLabels := labels(gotCode, gotMethod, sc.reqMethod, sc.respStatus, sc.extraMethods...)
+				if !equalLabels(gotLabels, sc.wantLabels) {
+					t.Errorf("wanted labels=%v for counter, got code=%v", sc.wantLabels, gotLabels)
+				}
+			}
+		})
+	}
+}
+
+func makeInstrumentedHandler(handler http.HandlerFunc, opts ...Option) (http.Handler, *prometheus.Registry) {
 	reg := prometheus.NewRegistry()
 
 	inFlightGauge := prometheus.NewGauge(prometheus.GaugeOpts{
@@ -249,25 +366,43 @@ func TestMiddlewareAPI(t *testing.T) {
 		[]string{},
 	)
 
-	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.Write([]byte("OK"))
-	})
-
 	reg.MustRegister(inFlightGauge, counter, histVec, responseSize, writeHeaderVec)
 
-	chain := InstrumentHandlerInFlight(inFlightGauge,
+	return InstrumentHandlerInFlight(inFlightGauge,
 		InstrumentHandlerCounter(counter,
 			InstrumentHandlerDuration(histVec,
 				InstrumentHandlerTimeToWriteHeader(writeHeaderVec,
-					InstrumentHandlerResponseSize(responseSize, handler),
-				),
-			),
-		),
-	)
+					InstrumentHandlerResponseSize(responseSize, handler, opts...),
+					opts...),
+				opts...),
+			opts...),
+	), reg
+}
+
+func TestMiddlewareAPI(t *testing.T) {
+	chain, reg := makeInstrumentedHandler(func(w http.ResponseWriter, r *http.Request) {
+		_, _ = w.Write([]byte("OK"))
+	})
 
 	r, _ := http.NewRequest("GET", "www.example.com", nil)
 	w := httptest.NewRecorder()
 	chain.ServeHTTP(w, r)
+
+	assetMetricAndExemplars(t, reg, 5, nil)
+}
+
+func TestMiddlewareAPI_WithExemplars(t *testing.T) {
+	exemplar := prometheus.Labels{"traceID": "example situation observed by this metric"}
+
+	chain, reg := makeInstrumentedHandler(func(w http.ResponseWriter, r *http.Request) {
+		_, _ = w.Write([]byte("OK"))
+	}, WithExemplarFromContext(func(_ context.Context) prometheus.Labels { return exemplar }))
+
+	r, _ := http.NewRequest("GET", "www.example.com", nil)
+	w := httptest.NewRecorder()
+	chain.ServeHTTP(w, r)
+
+	assetMetricAndExemplars(t, reg, 5, labelsToLabelPair(exemplar))
 }
 
 func TestInstrumentTimeToFirstWrite(t *testing.T) {