forked from TrueCloudLab/distribution
e3c37a46e2
at the first iteration, only the following metrics are collected:
- HTTP metrics of each API endpoint
- cache counter for request/hit/miss
- histogram of storage actions, including:
GetContent, PutContent, Stat, List, Move, and Delete
Signed-off-by: tifayuki <tifayuki@gmail.com>
93 lines
5.2 KiB
Markdown
93 lines
5.2 KiB
Markdown
# Prometheus Go client library
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[](https://travis-ci.org/prometheus/client_golang)
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[](https://goreportcard.com/report/github.com/prometheus/client_golang)
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This is the [Go](http://golang.org) client library for
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[Prometheus](http://prometheus.io). It has two separate parts, one for
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instrumenting application code, and one for creating clients that talk to the
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Prometheus HTTP API.
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__This library requires Go1.7 or later.__
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## Important note about releases, versioning, tagging, stability, and your favorite Go dependency management tool
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While our goal is to follow [Semantic Versioning](https://semver.org/), this
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repository is still pre-1.0.0. To quote the
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[Semantic Versioning spec](https://semver.org/#spec-item-4): “Anything may
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change at any time. The public API should not be considered stable.” We know
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that this is at odds with the widespread use of this library. However, just
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declaring something 1.0.0 doesn't make it 1.0.0. Instead, we are working
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towards a 1.0.0 release that actually deserves its major version number.
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Having said that, we aim for always keeping the tip of master in a workable
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state and for only introducing ”mildly” breaking changes up to and including
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[v0.9.0](https://github.com/prometheus/client_golang/milestone/1). After that,
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a number of ”hard” breaking changes are planned, see the
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[v0.10.0 milestone](https://github.com/prometheus/client_golang/milestone/2),
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which should get the library much closer to 1.0.0 state.
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Dependency management in Go projects is still in flux, and there are many tools
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floating around. While [dep](https://golang.github.io/dep/) might develop into
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the de-facto standard tool, it is still officially experimental. The roadmap
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for this library has been laid out with a lot of sometimes painful experience
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in mind. We really cannot adjust it every other month to the needs of the
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currently most popular or most promising Go dependency management tool. The
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recommended course of action with dependency management tools is the following:
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- Do not expect strict post-1.0.0 semver semantics prior to the 1.0.0
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release. If your dependency management tool expects strict post-1.0.0 semver
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semantics, you have to wait. Sorry.
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- If you want absolute certainty, please lock to a specific commit. You can
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also lock to tags, but please don't ask for more tagging. This would suggest
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some release or stability testing procedure that simply is not in place. As
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said above, we are aiming for stability of the tip of master, but if we
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tagged every single commit, locking to tags would be the same as locking to
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commits.
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- If you want to get the newer features and improvements and are willing to
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take the minor risk of newly introduced bugs and “mild” breakage, just always
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update to the tip of master (which is essentially the original idea of Go
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dependency management). We recommend to not use features marked as
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_deprecated_ in this case.
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- Once [v0.9.0](https://github.com/prometheus/client_golang/milestone/1) is
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out, you could lock to v0.9.x to get bugfixes (and perhaps minor new
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features) while avoiding the “hard” breakage that will come with post-0.9
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features.
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## Instrumenting applications
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[](http://gocover.io/github.com/prometheus/client_golang/prometheus) [](https://godoc.org/github.com/prometheus/client_golang/prometheus)
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The
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[`prometheus` directory](https://github.com/prometheus/client_golang/tree/master/prometheus)
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contains the instrumentation library. See the
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[best practices section](http://prometheus.io/docs/practices/naming/) of the
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Prometheus documentation to learn more about instrumenting applications.
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The
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[`examples` directory](https://github.com/prometheus/client_golang/tree/master/examples)
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contains simple examples of instrumented code.
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## Client for the Prometheus HTTP API
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[](http://gocover.io/github.com/prometheus/client_golang/api/prometheus/v1) [](https://godoc.org/github.com/prometheus/client_golang/api)
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The
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[`api/prometheus` directory](https://github.com/prometheus/client_golang/tree/master/api/prometheus)
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contains the client for the
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[Prometheus HTTP API](http://prometheus.io/docs/querying/api/). It allows you
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to write Go applications that query time series data from a Prometheus
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server. It is still in alpha stage.
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## Where is `model`, `extraction`, and `text`?
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The `model` packages has been moved to
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[`prometheus/common/model`](https://github.com/prometheus/common/tree/master/model).
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The `extraction` and `text` packages are now contained in
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[`prometheus/common/expfmt`](https://github.com/prometheus/common/tree/master/expfmt).
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## Contributing and community
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See the [contributing guidelines](CONTRIBUTING.md) and the
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[Community section](http://prometheus.io/community/) of the homepage.
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