Prometheus instrumentation library for Go applications
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Matt Harbison a5e134014f
process_collector: fill in most statistics on macOS (#1600)
* process_collector: fill in most statistics on macOS

Unfortunately, the virtual memory, resident memory, and network stats will
require access to undocumented C functions.  I was warned off of cgo in IRC
because it would then have to be enabled in a bunch of different projects that
use this module, but I already was against it because that would break the
ability to cross-compile.  There is no interface to `dlopen` built into golang.
The `github.com/ebitengine/purego` module looks promising (I can cross-compile
and call these methods), but I'm currently getting unexpected results.  I'll
follow up with that separately if I can get it working, but hopefully this stuff
is pretty uncontroversial.

Tested on macOS 10.14.6 (amd64), macOS 14.6.1 (amd64), and macOS 15.0 (arm64)
by spawning `/usr/bin/ulimit -a -S` and `/usr/sbin/lsof -c $my_process` from
the test exporter process, and `ps -o lstart,vsize,rss,utime,stime,command` from
the shell, and comparing results with the exported metrics.

I can't find documentation for `RLIMIT_AS` on macOS (specifically if it's in
bytes or pages).  It's currently being reported back as `RLIM_INFINITY`, which
seems reasonable, because I've come across reports that the value is ignored
anyway[1].  The bash 3.2 code for the built-in `ulimit` divides the value
reported by `getrusage(2)` by 1024 when printing, as it does for `RLIMIT_DATA`,
which is documented as being bytes in `getrusage(2)`.  The help for `ulimit`
indicates it prints both in kbytes, so it's reasonable to assume this is already
in bytes.

[1] https://issues.chromium.org/issues/40581251#comment3

Signed-off-by: Matt Harbison <mharbison72@gmail.com>

* Update prometheus/process_collector_darwin.go

Co-authored-by: Ben Kochie <superq@gmail.com>
Signed-off-by: Matt Harbison <57785103+mharbison72@users.noreply.github.com>

---------

Signed-off-by: Matt Harbison <mharbison72@gmail.com>
Signed-off-by: Matt Harbison <57785103+mharbison72@users.noreply.github.com>
Co-authored-by: Ben Kochie <superq@gmail.com>
Co-authored-by: Bartlomiej Plotka <bwplotka@gmail.com>
2024-09-04 15:56:01 +01:00
.bingo Fixed README & CHANGELOG; Added fmt makefile command (+bingo) for easier contributions. (#1289) 2023-06-13 14:54:49 +01:00
.github Update common Prometheus files (#1615) 2024-09-03 10:00:24 +01:00
api deps: Updated to prometheus/common to 0.55 (#1566) 2024-07-29 15:05:07 +01:00
dagger Update Dagger and build. (#1610) 2024-09-02 11:40:53 +00:00
examples examples: Improved GoCollector example. (#1589) 2024-09-02 16:43:16 +02:00
internal/github.com/golang/gddo feat: Support zstd compression (#1496) 2024-06-07 15:56:19 +01:00
prometheus process_collector: fill in most statistics on macOS (#1600) 2024-09-04 15:56:01 +01:00
tutorials/whatsup Update Dagger and build. (#1610) 2024-09-02 11:40:53 +00:00
.gitignore Cut v1.15.0 (#1249) 2023-04-13 12:51:09 +02:00
.golangci.yml changed the name of all variables with min/max name (#1606) 2024-09-02 07:41:40 -03:00
CHANGELOG.md Cut 1.20.2 2024-08-23 18:55:43 +02:00
CODE_OF_CONDUCT.md Update common Prometheus files (#1045) 2022-05-05 07:46:54 +02:00
CONTRIBUTING.md chore: Remove half-implemented changelog automation (#1564) 2024-07-19 17:12:40 +01:00
Dockerfile prometheus: Fix convention violating names for generated collector metrics (#1048) 2022-05-09 10:33:45 +02:00
LICENSE License cleanup 2015-01-22 16:13:15 +01:00
MAINTAINERS.md Update MAINTAINERS.md (#1362) 2023-10-05 14:14:58 +01:00
Makefile ci: daggerize test and lint pipelines (#1534) 2024-08-07 14:49:16 +02:00
Makefile.common Update linting 2024-08-30 18:09:51 +02:00
NOTICE Remove inlined upstream code (#1539) 2024-06-20 13:05:41 +02:00
README.md Update supported Go versions 2024-08-31 22:47:31 +02:00
SECURITY.md Update common Prometheus files (#1045) 2022-05-05 07:46:54 +02:00
VERSION Cut 1.20.2 2024-08-23 18:55:43 +02:00
dagger.json ci: bump dagger to the latest version (#1588) 2024-08-20 09:48:50 +01:00
generate-go-collector.bash Auto-update Go Collector Metrics for new Go versions (#1476) 2024-03-26 12:42:34 +00:00
go.mod Merge pull request #1612 from prometheus/dependabot/go_modules/github.com/prometheus/common-0.57.0 2024-09-01 09:09:58 +00:00
go.sum Merge pull request #1612 from prometheus/dependabot/go_modules/github.com/prometheus/common-0.57.0 2024-09-01 09:09:58 +00:00
supported_go_versions.txt Update supported Go versions 2024-08-31 22:47:31 +02:00
update-go-version.bash feat: metrics generation workflow (#1481) 2024-04-04 08:25:38 +02:00

README.md

Prometheus Go client library

CI Go Report Card Go Reference Slack

This is the Go client library for Prometheus. 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 Go1.21 or later.

The library mandates the use of Go1.21 or subsequent versions. While it has demonstrated functionality with versions as old as Go 1.17, our commitment remains to offer support and rectifications for only the most recent three major releases.

Important note about releases and stability

This repository generally follows Semantic Versioning. However, the API client in prometheus/client_golang/api/… is still considered experimental. Breaking changes of the API client will not trigger a new major release. The same is true for selected other new features explicitly marked as EXPERIMENTAL in CHANGELOG.md.

Features that require breaking changes in the stable parts of the repository are being batched up and tracked in the v2 milestone, but plans for further development of v2 at the moment.

NOTE: The initial v2 attempt is in a separate branch. We also started experimenting on a new prometheus.V2.* APIs in the 1.x's V2 struct. Help wanted!

Instrumenting applications

Go Reference

The prometheus directory contains the instrumentation library. See the guide on the Prometheus website to learn more about instrumenting applications.

The examples directory contains simple examples of instrumented code.

Client for the Prometheus HTTP API

Go Reference

The api/prometheus directory contains the client for the Prometheus HTTP API. It allows you to write Go applications that query time series data from a Prometheus server. It is still in alpha stage.

Where is model, extraction, and text?

The model packages has been moved to prometheus/common/model.

The extraction and text packages are now contained in prometheus/common/expfmt.

Contributing and community

See the contributing guidelines and the Community section of the homepage.

client_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> 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.