Merge branch 'master' into sparsehistogram

CHANGELOG.md

@@ -1,3 +1,14 @@
+## 1.11.0 / 2021-06-07
+
+* [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
 
 * [CHANGE] Minimum required Go version is now 1.13.
@@ -14,7 +25,7 @@
 
 * [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
 
@@ -94,6 +105,7 @@ _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
@@ -103,6 +115,7 @@ _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
@@ -124,14 +137,16 @@ _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 
+* [ENHANCEMENT] Improved doc comments and error messages. #504
 * [BUGFIX] Fix race condition during metrics gathering. #512
 * [BUGFIX] Fix testutil metric comparison for Histograms and empty labels. #494
   #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
@@ -144,6 +159,7 @@ _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.
@@ -196,6 +212,7 @@ _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
@@ -219,6 +236,7 @@ _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.
@@ -229,12 +247,14 @@ _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.
@@ -253,6 +273,7 @@ _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.
@@ -262,16 +283,19 @@ _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.
@@ -286,6 +310,7 @@ _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).
@@ -302,5 +327,6 @@ _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.

MAINTAINERS.md

@@ -1 +1,2 @@
-* Björn Rabenstein <beorn@grafana.com> @beorn7
+* Bartłomiej Płotka <bwplotka@gmail.com> @bwplotka
+* Kemal Akkoyun <kakkoyun@gmail.com> @kakkoyun

VERSION

@@ -1 +1 @@
-1.10.0
+1.11.0

go.mod

@@ -4,11 +4,13 @@ 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 v1.1.10
+	github.com/json-iterator/go v1.1.11
 	github.com/prometheus/client_model v0.2.1-0.20210403151606-24db95a3d5d6
-	github.com/prometheus/common v0.18.0
+	github.com/prometheus/common v0.26.0
 	github.com/prometheus/procfs v0.6.0
-	golang.org/x/sys v0.0.0-20210309074719-68d13333faf2
+	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
 )
 
 go 1.13

go.sum

@@ -1,77 +1,26 @@
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-github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
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@@ -83,64 +32,21 @@ github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvq
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prometheus/collectors/collectors.go

@@ -0,0 +1,16 @@
+// 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 collectors provides implementations of prometheus.Collector to
+// conveniently collect process and Go-related metrics.
+package collectors

prometheus/collectors/dbstats_collector.go

@@ -0,0 +1,119 @@
+// 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 collectors
+
+import (
+	"database/sql"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type dbStatsCollector struct {
+	db *sql.DB
+
+	maxOpenConnections *prometheus.Desc
+
+	openConnections  *prometheus.Desc
+	inUseConnections *prometheus.Desc
+	idleConnections  *prometheus.Desc
+
+	waitCount         *prometheus.Desc
+	waitDuration      *prometheus.Desc
+	maxIdleClosed     *prometheus.Desc
+	maxIdleTimeClosed *prometheus.Desc
+	maxLifetimeClosed *prometheus.Desc
+}
+
+// NewDBStatsCollector returns a collector that exports metrics about the given *sql.DB.
+// See https://golang.org/pkg/database/sql/#DBStats for more information on stats.
+func NewDBStatsCollector(db *sql.DB, dbName string) prometheus.Collector {
+	fqName := func(name string) string {
+		return "go_sql_" + name
+	}
+	return &dbStatsCollector{
+		db: db,
+		maxOpenConnections: prometheus.NewDesc(
+			fqName("max_open_connections"),
+			"Maximum number of open connections to the database.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		openConnections: prometheus.NewDesc(
+			fqName("open_connections"),
+			"The number of established connections both in use and idle.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		inUseConnections: prometheus.NewDesc(
+			fqName("in_use_connections"),
+			"The number of connections currently in use.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		idleConnections: prometheus.NewDesc(
+			fqName("idle_connections"),
+			"The number of idle connections.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		waitCount: prometheus.NewDesc(
+			fqName("wait_count_total"),
+			"The total number of connections waited for.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		waitDuration: prometheus.NewDesc(
+			fqName("wait_duration_seconds_total"),
+			"The total time blocked waiting for a new connection.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		maxIdleClosed: prometheus.NewDesc(
+			fqName("max_idle_closed_total"),
+			"The total number of connections closed due to SetMaxIdleConns.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		maxIdleTimeClosed: prometheus.NewDesc(
+			fqName("max_idle_time_closed_total"),
+			"The total number of connections closed due to SetConnMaxIdleTime.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		maxLifetimeClosed: prometheus.NewDesc(
+			fqName("max_lifetime_closed_total"),
+			"The total number of connections closed due to SetConnMaxLifetime.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+	}
+}
+
+// Describe implements Collector.
+func (c *dbStatsCollector) Describe(ch chan<- *prometheus.Desc) {
+	ch <- c.maxOpenConnections
+	ch <- c.openConnections
+	ch <- c.inUseConnections
+	ch <- c.idleConnections
+	ch <- c.waitCount
+	ch <- c.waitDuration
+	ch <- c.maxIdleClosed
+	ch <- c.maxLifetimeClosed
+	c.describeNewInGo115(ch)
+}
+
+// Collect implements Collector.
+func (c *dbStatsCollector) Collect(ch chan<- prometheus.Metric) {
+	stats := c.db.Stats()
+	ch <- prometheus.MustNewConstMetric(c.maxOpenConnections, prometheus.GaugeValue, float64(stats.MaxOpenConnections))
+	ch <- prometheus.MustNewConstMetric(c.openConnections, prometheus.GaugeValue, float64(stats.OpenConnections))
+	ch <- prometheus.MustNewConstMetric(c.inUseConnections, prometheus.GaugeValue, float64(stats.InUse))
+	ch <- prometheus.MustNewConstMetric(c.idleConnections, prometheus.GaugeValue, float64(stats.Idle))
+	ch <- prometheus.MustNewConstMetric(c.waitCount, prometheus.CounterValue, float64(stats.WaitCount))
+	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)
+}

prometheus/collectors/dbstats_collector_go115.go

@@ -0,0 +1,30 @@
+// 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.
+
+// +build go1.15
+
+package collectors
+
+import (
+	"database/sql"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+func (c *dbStatsCollector) describeNewInGo115(ch chan<- *prometheus.Desc) {
+	ch <- c.maxIdleTimeClosed
+}
+
+func (c *dbStatsCollector) collectNewInGo115(ch chan<- prometheus.Metric, stats sql.DBStats) {
+	ch <- prometheus.MustNewConstMetric(c.maxIdleTimeClosed, prometheus.CounterValue, float64(stats.MaxIdleTimeClosed))
+}

prometheus/collectors/dbstats_collector_pre_go115.go

@@ -0,0 +1,26 @@
+// 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.
+
+// +build !go1.15
+
+package collectors
+
+import (
+	"database/sql"
+
+	"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) {}

prometheus/collectors/dbstats_collector_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.
+
+package collectors
+
+import (
+	"database/sql"
+	"runtime"
+	"testing"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+func TestDBStatsCollector(t *testing.T) {
+	reg := prometheus.NewRegistry()
+	{
+		db := new(sql.DB)
+		if err := reg.Register(NewDBStatsCollector(db, "db_A")); err != nil {
+			t.Fatal(err)
+		}
+	}
+	{
+		db := new(sql.DB)
+		if err := reg.Register(NewDBStatsCollector(db, "db_B")); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	mfs, err := reg.Gather()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	names := []string{
+		"go_sql_max_open_connections",
+		"go_sql_open_connections",
+		"go_sql_in_use_connections",
+		"go_sql_idle_connections",
+		"go_sql_wait_count_total",
+		"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")
+	}
+	type result struct {
+		found bool
+	}
+	results := make(map[string]result)
+	for _, name := range names {
+		results[name] = result{found: false}
+	}
+	for _, mf := range mfs {
+		m := mf.GetMetric()
+		if len(m) != 2 {
+			t.Errorf("expected 2 metrics bug got %d", len(m))
+		}
+		labelA := m[0].GetLabel()[0]
+		if name := labelA.GetName(); name != "db_name" {
+			t.Errorf("expected to get label \"db_name\" but got %s", name)
+		}
+		if value := labelA.GetValue(); value != "db_A" {
+			t.Errorf("expected to get value \"db_A\" but got %s", value)
+		}
+		labelB := m[1].GetLabel()[0]
+		if name := labelB.GetName(); name != "db_name" {
+			t.Errorf("expected to get label \"db_name\" but got %s", name)
+		}
+		if value := labelB.GetValue(); value != "db_B" {
+			t.Errorf("expected to get value \"db_B\" but got %s", value)
+		}
+
+		for _, name := range names {
+			if name == mf.GetName() {
+				results[name] = result{found: true}
+				break
+			}
+		}
+	}
+
+	for name, result := range results {
+		if !result.found {
+			t.Errorf("%s not found", name)
+		}
+	}
+}

prometheus/collectors/expvar_collector.go

@@ -0,0 +1,57 @@
+// 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 collectors
+
+import "github.com/prometheus/client_golang/prometheus"
+
+// NewExpvarCollector returns a newly allocated expvar Collector.
+//
+// An expvar Collector collects metrics from the expvar interface. It provides a
+// quick way to expose numeric values that are already exported via expvar as
+// Prometheus metrics. Note that the data models of expvar and Prometheus are
+// fundamentally different, and that the expvar Collector is inherently slower
+// than native Prometheus metrics. Thus, the expvar Collector is probably great
+// for experiments and prototying, but you should seriously consider a more
+// direct implementation of Prometheus metrics for monitoring production
+// systems.
+//
+// The exports map has the following meaning:
+//
+// The keys in the map correspond to expvar keys, i.e. for every expvar key you
+// want to export as Prometheus metric, you need an entry in the exports
+// map. The descriptor mapped to each key describes how to export the expvar
+// value. It defines the name and the help string of the Prometheus metric
+// proxying the expvar value. The type will always be Untyped.
+//
+// For descriptors without variable labels, the expvar value must be a number or
+// a bool. The number is then directly exported as the Prometheus sample
+// value. (For a bool, 'false' translates to 0 and 'true' to 1). Expvar values
+// that are not numbers or bools are silently ignored.
+//
+// If the descriptor has one variable label, the expvar value must be an expvar
+// map. The keys in the expvar map become the various values of the one
+// Prometheus label. The values in the expvar map must be numbers or bools again
+// as above.
+//
+// For descriptors with more than one variable label, the expvar must be a
+// nested expvar map, i.e. where the values of the topmost map are maps again
+// etc. until a depth is reached that corresponds to the number of labels. The
+// leaves of that structure must be numbers or bools as above to serve as the
+// sample values.
+//
+// Anything that does not fit into the scheme above is silently ignored.
+func NewExpvarCollector(exports map[string]*prometheus.Desc) prometheus.Collector {
+	//nolint:staticcheck // Ignore SA1019 until v2.
+	return prometheus.NewExpvarCollector(exports)
+}

prometheus/collectors/go_collector.go

@@ -0,0 +1,69 @@
+// 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 collectors
+
+import "github.com/prometheus/client_golang/prometheus"
+
+// NewGoCollector returns a collector that exports metrics about the current Go
+// process. This includes memory stats. To collect those, runtime.ReadMemStats
+// is called. This requires to “stop the world”, which usually only happens for
+// garbage collection (GC). Take the following implications into account when
+// deciding whether to use the Go collector:
+//
+// 1. The performance impact of stopping the world is the more relevant the more
+// frequently metrics are collected. However, with Go1.9 or later the
+// stop-the-world time per metrics collection is very short (~25µs) so that the
+// performance impact will only matter in rare cases. However, with older Go
+// versions, the stop-the-world duration depends on the heap size and can be
+// quite significant (~1.7 ms/GiB as per
+// https://go-review.googlesource.com/c/go/+/34937).
+//
+// 2. During an ongoing GC, nothing else can stop the world. Therefore, if the
+// metrics collection happens to coincide with GC, it will only complete after
+// GC has finished. Usually, GC is fast enough to not cause problems. However,
+// with a very large heap, GC might take multiple seconds, which is enough to
+// cause scrape timeouts in common setups. To avoid this problem, the Go
+// collector will use the memstats from a previous collection if
+// runtime.ReadMemStats takes more than 1s. However, if there are no previously
+// collected memstats, or their collection is more than 5m ago, the collection
+// will block until runtime.ReadMemStats succeeds.
+//
+// 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/process_collector.go

@@ -0,0 +1,56 @@
+// 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 collectors
+
+import "github.com/prometheus/client_golang/prometheus"
+
+// ProcessCollectorOpts defines the behavior of a process metrics collector
+// created with NewProcessCollector.
+type ProcessCollectorOpts struct {
+	// PidFn returns the PID of the process the collector collects metrics
+	// for. It is called upon each collection. By default, the PID of the
+	// current process is used, as determined on construction time by
+	// calling os.Getpid().
+	PidFn func() (int, error)
+	// If non-empty, each of the collected metrics is prefixed by the
+	// provided string and an underscore ("_").
+	Namespace string
+	// If true, any error encountered during collection is reported as an
+	// invalid metric (see NewInvalidMetric). Otherwise, errors are ignored
+	// and the collected metrics will be incomplete. (Possibly, no metrics
+	// will be collected at all.) While that's usually not desired, it is
+	// appropriate for the common "mix-in" of process metrics, where process
+	// metrics are nice to have, but failing to collect them should not
+	// disrupt the collection of the remaining metrics.
+	ReportErrors bool
+}
+
+// NewProcessCollector returns a collector which exports the current state of
+// process metrics including CPU, memory and file descriptor usage as well as
+// the process start time. The detailed behavior is defined by the provided
+// ProcessCollectorOpts. The zero value of ProcessCollectorOpts creates a
+// collector for the current process with an empty namespace string and no error
+// reporting.
+//
+// The collector only works on operating systems with a Linux-style proc
+// filesystem and on Microsoft Windows. On other operating systems, it will not
+// collect any metrics.
+func NewProcessCollector(opts ProcessCollectorOpts) prometheus.Collector {
+	//nolint:staticcheck // Ignore SA1019 until v2.
+	return prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{
+		PidFn:        opts.PidFn,
+		Namespace:    opts.Namespace,
+		ReportErrors: opts.ReportErrors,
+	})
+}

prometheus/expvar_collector.go

@@ -22,43 +22,10 @@ type expvarCollector struct {
 	exports map[string]*Desc
 }
 
-// NewExpvarCollector returns a newly allocated expvar Collector that still has
+// NewExpvarCollector is the obsolete version of collectors.NewExpvarCollector.
-// to be registered with a Prometheus registry.
+// See there for documentation.
 //
-// An expvar Collector collects metrics from the expvar interface. It provides a
+// Deprecated: Use collectors.NewExpvarCollector instead.
-// quick way to expose numeric values that are already exported via expvar as
-// Prometheus metrics. Note that the data models of expvar and Prometheus are
-// fundamentally different, and that the expvar Collector is inherently slower
-// than native Prometheus metrics. Thus, the expvar Collector is probably great
-// for experiments and prototying, but you should seriously consider a more
-// direct implementation of Prometheus metrics for monitoring production
-// systems.
-//
-// The exports map has the following meaning:
-//
-// The keys in the map correspond to expvar keys, i.e. for every expvar key you
-// want to export as Prometheus metric, you need an entry in the exports
-// map. The descriptor mapped to each key describes how to export the expvar
-// value. It defines the name and the help string of the Prometheus metric
-// proxying the expvar value. The type will always be Untyped.
-//
-// For descriptors without variable labels, the expvar value must be a number or
-// a bool. The number is then directly exported as the Prometheus sample
-// value. (For a bool, 'false' translates to 0 and 'true' to 1). Expvar values
-// that are not numbers or bools are silently ignored.
-//
-// If the descriptor has one variable label, the expvar value must be an expvar
-// map. The keys in the expvar map become the various values of the one
-// Prometheus label. The values in the expvar map must be numbers or bools again
-// as above.
-//
-// For descriptors with more than one variable label, the expvar must be a
-// nested expvar map, i.e. where the values of the topmost map are maps again
-// etc. until a depth is reached that corresponds to the number of labels. The
-// leaves of that structure must be numbers or bools as above to serve as the
-// sample values.
-//
-// Anything that does not fit into the scheme above is silently ignored.
 func NewExpvarCollector(exports map[string]*Desc) Collector {
 	return &expvarCollector{
 		exports: exports,

prometheus/go_collector.go

@@ -36,32 +36,10 @@ type goCollector struct {
 	msMaxAge        time.Duration           // Maximum allowed age of old memstats.
 }
 
-// NewGoCollector returns a collector that exports metrics about the current Go
+// NewGoCollector is the obsolete version of collectors.NewGoCollector.
-// process. This includes memory stats. To collect those, runtime.ReadMemStats
+// See there for documentation.
-// is called. This requires to “stop the world”, which usually only happens for
-// garbage collection (GC). Take the following implications into account when
-// deciding whether to use the Go collector:
 //
-// 1. The performance impact of stopping the world is the more relevant the more
+// Deprecated: Use collectors.NewGoCollector instead.
-// frequently metrics are collected. However, with Go1.9 or later the
-// stop-the-world time per metrics collection is very short (~25µs) so that the
-// performance impact will only matter in rare cases. However, with older Go
-// versions, the stop-the-world duration depends on the heap size and can be
-// quite significant (~1.7 ms/GiB as per
-// https://go-review.googlesource.com/c/go/+/34937).
-//
-// 2. During an ongoing GC, nothing else can stop the world. Therefore, if the
-// metrics collection happens to coincide with GC, it will only complete after
-// GC has finished. Usually, GC is fast enough to not cause problems. However,
-// with a very large heap, GC might take multiple seconds, which is enough to
-// cause scrape timeouts in common setups. To avoid this problem, the Go
-// collector will use the memstats from a previous collection if
-// runtime.ReadMemStats takes more than 1s. However, if there are no previously
-// collected memstats, or their collection is more than 5m ago, the collection
-// will block until runtime.ReadMemStats succeeds.
-//
-// NOTE: The problem is solved in Go 1.15, see
-// https://github.com/golang/go/issues/19812 for the related Go issue.
 func NewGoCollector() Collector {
 	return &goCollector{
 		goroutinesDesc: NewDesc(
@@ -366,23 +344,10 @@ type memStatsMetrics []struct {
 	valType ValueType
 }
 
-// NewBuildInfoCollector returns a collector collecting a single metric
+// NewBuildInfoCollector is the obsolete version of collectors.NewBuildInfoCollector.
-// "go_build_info" with the constant value 1 and three labels "path", "version",
+// See there for documentation.
-// 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
+// Deprecated: Use collectors.NewBuildInfoCollector instead.
-// https://github.com/povilasv/prommod for an example of a collector for the
-// module dependencies.
 func NewBuildInfoCollector() Collector {
 	path, version, sum := "unknown", "unknown", "unknown"
 	if bi, ok := debug.ReadBuildInfo(); ok {

prometheus/histogram.go

@@ -47,7 +47,12 @@ type Histogram interface {
 	Metric
 	Collector
 
-	// Observe adds a single observation to the histogram.
+	// Observe adds a single observation to the histogram. Observations are
+	// usually positive or zero. Negative observations are accepted but
+	// prevent current versions of Prometheus from properly detecting
+	// counter resets in the sum of observations. See
+	// https://prometheus.io/docs/practices/histograms/#count-and-sum-of-observations
+	// for details.
 	Observe(float64)
 }
 

prometheus/process_collector.go

@@ -54,16 +54,10 @@ type ProcessCollectorOpts struct {
 	ReportErrors bool
 }
 
-// NewProcessCollector returns a collector which exports the current state of
+// NewProcessCollector is the obsolete version of collectors.NewProcessCollector.
-// process metrics including CPU, memory and file descriptor usage as well as
+// See there for documentation.
-// the process start time. The detailed behavior is defined by the provided
-// ProcessCollectorOpts. The zero value of ProcessCollectorOpts creates a
-// collector for the current process with an empty namespace string and no error
-// reporting.
 //
-// The collector only works on operating systems with a Linux-style proc
+// Deprecated: Use collectors.NewProcessCollector instead.
-// filesystem and on Microsoft Windows. On other operating systems, it will not
-// collect any metrics.
 func NewProcessCollector(opts ProcessCollectorOpts) Collector {
 	ns := ""
 	if len(opts.Namespace) > 0 {

prometheus/summary.go

@@ -55,7 +55,12 @@ type Summary interface {
 	Metric
 	Collector
 
-	// Observe adds a single observation to the summary.
+	// Observe adds a single observation to the summary. Observations are
+	// usually positive or zero. Negative observations are accepted but
+	// prevent current versions of Prometheus from properly detecting
+	// counter resets in the sum of observations. See
+	// https://prometheus.io/docs/practices/histograms/#count-and-sum-of-observations
+	// for details.
 	Observe(float64)
 }
 
@@ -121,7 +126,9 @@ type SummaryOpts struct {
 	Objectives map[float64]float64
 
 	// MaxAge defines the duration for which an observation stays relevant
-	// for the summary. Must be positive. The default value is DefMaxAge.
+	// for the summary. Only applies to pre-calculated quantiles, does not
+	// apply to _sum and _count. Must be positive. The default value is
+	// DefMaxAge.
 	MaxAge time.Duration
 
 	// AgeBuckets is the number of buckets used to exclude observations that