Prometheus instrumentation library for Go applications
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Bryan Boreham 4dd3cbb4ab
API client: make http reads more efficient (#976)
Replace `io.ReadAll` with `bytes.Buffer.ReadFrom`.
Both need to resize a buffer until they have finished reading;
the former increases by 1.25x each time while the latter uses 2x.

Also added a benchmark to demonstrate the benefit:
name             old time/op    new time/op    delta
Client/4KB-8       35.9µs ± 4%    35.3µs ± 3%     ~     (p=0.310 n=5+5)
Client/50KB-8      83.1µs ± 8%    69.5µs ± 1%  -16.37%  (p=0.008 n=5+5)
Client/1000KB-8     891µs ± 6%     750µs ± 0%  -15.83%  (p=0.016 n=5+4)
Client/2000KB-8    1.74ms ± 2%    1.35ms ± 1%  -22.72%  (p=0.008 n=5+5)

name             old alloc/op   new alloc/op   delta
Client/4KB-8       20.2kB ± 0%    20.4kB ± 0%   +1.26%  (p=0.008 n=5+5)
Client/50KB-8       218kB ± 0%     136kB ± 0%  -37.65%  (p=0.008 n=5+5)
Client/1000KB-8    5.88MB ± 0%    2.11MB ± 0%  -64.10%  (p=0.008 n=5+5)
Client/2000KB-8    11.7MB ± 0%     4.2MB ± 0%  -63.93%  (p=0.008 n=5+5)

name             old allocs/op  new allocs/op  delta
Client/4KB-8         75.0 ± 0%      72.0 ± 0%   -4.00%  (p=0.008 n=5+5)
Client/50KB-8         109 ± 0%        98 ± 0%  -10.09%  (p=0.079 n=4+5)
Client/1000KB-8       617 ± 0%       593 ± 0%   -3.89%  (p=0.008 n=5+5)
Client/2000KB-8     1.13k ± 0%     1.09k ± 0%   -3.27%  (p=0.008 n=5+5)

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
2022-01-25 11:16:10 +01:00
.circleci Update common Prometheus files 2021-12-20 20:51:20 +00:00
.github Update common Prometheus files 2021-12-20 20:51:20 +00:00
api API client: make http reads more efficient (#976) 2022-01-25 11:16:10 +01:00
examples Move flags and metrics into main() 2021-11-10 16:20:42 +01:00
prometheus Use simpler locking in the Go 1.17 collector (#975) 2022-01-25 08:43:45 +01:00
.gitignore Update .gitignore 2019-07-30 23:07:13 +02:00
.golangci.yml Add .golangci.yml 2019-04-25 10:38:07 +02:00
CHANGELOG.md Cut v1.12.0 (#966) 2022-01-19 07:59:25 +00:00
CODE_OF_CONDUCT.md Update common Prometheus files 2020-06-23 00:08:53 +00:00
CONTRIBUTING.md Mention the DCO in the contributing guide 2018-05-31 14:22:30 +00:00
Dockerfile add minor Dockerfile improvements 2019-07-31 09:13:29 -07:00
LICENSE License cleanup 2015-01-22 16:13:15 +01:00
MAINTAINERS.md Change maintainers from @beorn7 to @bwplotka/@kakkoyun (#873) 2021-06-01 14:13:09 +01:00
Makefile Add lint:ignore for protobuf deprecation 2020-05-14 20:11:22 +02:00
Makefile.common Update common Prometheus files 2021-12-20 20:51:20 +00:00
NOTICE Create a public registry interface and separate out HTTP exposition 2016-08-02 18:46:22 +02:00
README.md Update status badgets 2021-06-23 10:12:43 +02:00
SECURITY.md Add SECURITY.md 2021-01-16 13:57:42 +01:00
VERSION Cut v1.12.0 (#966) 2022-01-19 07:59:25 +00:00
go.mod go.*: Update dependencies (#965) 2022-01-18 20:32:44 +01:00
go.sum go.*: Update dependencies (#965) 2022-01-18 20:32:44 +01:00

README.md

Prometheus Go client library

CircleCI Go Report Card Go Reference

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 Go1.13 or later.

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. The v2 development happens in a separate branch 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 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

code-coverage 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.