894c201d62
We should never modify (or even shallow copy) Config after config.Load; added comments and modified GetScrapeConfigs to do so. For GetScrapeConfigs the validation (even repeated) was likely doing writes (because global fields was 0). We GetScrapeConfigs concurrently in tests and ApplyConfig causing test races. In prod there were races but likelyt only to replace 0 with 0, so not too severe. I remove validation since I don't see anyone using our config.Config without Load or UnmarshalYAML. We can add another validation method if there are use cases for this. Fixes #15538 Alternatives: * Add config mutex for GetScrapeConfigs (more complex and slow) * Copy Config (Config struct is huge and required complex deep copy) * Second validate is noop * e.g. by checking if global is 0 (prone to errors in future) * e.g. once.Sync validation - this introduces state and mutex, let's avoid it until we know it's needed (multiple ways of loading config) Signed-off-by: bwplotka <bwplotka@gmail.com> |
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|---|---|---|
| .circleci | ||
| .github | ||
| cmd | ||
| config | ||
| discovery | ||
| docs | ||
| documentation | ||
| model | ||
| notifier | ||
| plugins | ||
| prompb | ||
| promql | ||
| rules | ||
| scrape | ||
| scripts | ||
| storage | ||
| template | ||
| tracing | ||
| tsdb | ||
| util | ||
| web | ||
| .dockerignore | ||
| .gitignore | ||
| .gitpod.Dockerfile | ||
| .gitpod.yml | ||
| .golangci.yml | ||
| .promu.yml | ||
| .yamllint | ||
| CHANGELOG.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| Dockerfile | ||
| go.mod | ||
| go.sum | ||
| LICENSE | ||
| MAINTAINERS.md | ||
| Makefile | ||
| Makefile.common | ||
| NOTICE | ||
| plugins.yml | ||
| README.md | ||
| RELEASE.md | ||
| SECURITY-INSIGHTS.yml | ||
| SECURITY.md | ||
| ui-commits | ||
| VERSION | ||
Prometheus
Visit prometheus.io for the full documentation, examples and guides.
Prometheus, a Cloud Native Computing Foundation project, is a systems and service monitoring system. It collects metrics from configured targets at given intervals, evaluates rule expressions, displays the results, and can trigger alerts when specified conditions are observed.
The features that distinguish Prometheus from other metrics and monitoring systems are:
- A multi-dimensional data model (time series defined by metric name and set of key/value dimensions)
- PromQL, a powerful and flexible query language to leverage this dimensionality
- No dependency on distributed storage; single server nodes are autonomous
- An HTTP pull model for time series collection
- Pushing time series is supported via an intermediary gateway for batch jobs
- Targets are discovered via service discovery or static configuration
- Multiple modes of graphing and dashboarding support
- Support for hierarchical and horizontal federation
Architecture overview
Install
There are various ways of installing Prometheus.
Precompiled binaries
Precompiled binaries for released versions are available in the download section on prometheus.io. Using the latest production release binary is the recommended way of installing Prometheus. See the Installing chapter in the documentation for all the details.
Docker images
Docker images are available on Quay.io or Docker Hub.
You can launch a Prometheus container for trying it out with
docker run --name prometheus -d -p 127.0.0.1:9090:9090 prom/prometheus
Prometheus will now be reachable at http://localhost:9090/.
Building from source
To build Prometheus from source code, You need:
- Go version 1.17 or greater.
- NodeJS version 16 or greater.
- npm version 7 or greater.
Start by cloning the repository:
git clone https://github.com/prometheus/prometheus.git
cd prometheus
You can use the go tool to build and install the prometheus
and promtool binaries into your GOPATH:
GO111MODULE=on go install github.com/prometheus/prometheus/cmd/...
prometheus --config.file=your_config.yml
However, when using go install to build Prometheus, Prometheus will expect to be able to
read its web assets from local filesystem directories under web/ui/static and
web/ui/templates. In order for these assets to be found, you will have to run Prometheus
from the root of the cloned repository. Note also that these directories do not include the
React UI unless it has been built explicitly using make assets or make build.
An example of the above configuration file can be found here.
You can also build using make build, which will compile in the web assets so that
Prometheus can be run from anywhere:
make build
./prometheus --config.file=your_config.yml
The Makefile provides several targets:
- build: build the
prometheusandpromtoolbinaries (includes building and compiling in web assets) - test: run the tests
- test-short: run the short tests
- format: format the source code
- vet: check the source code for common errors
- assets: build the React UI
Service discovery plugins
Prometheus is bundled with many service discovery plugins. When building Prometheus from source, you can edit the plugins.yml file to disable some service discoveries. The file is a yaml-formatted list of go import path that will be built into the Prometheus binary.
After you have changed the file, you
need to run make build again.
If you are using another method to compile Prometheus, make plugins will
generate the plugins file accordingly.
If you add out-of-tree plugins, which we do not endorse at the moment,
additional steps might be needed to adjust the go.mod and go.sum files. As
always, be extra careful when loading third party code.
Building the Docker image
The make docker target is designed for use in our CI system.
You can build a docker image locally with the following commands:
make promu
promu crossbuild -p linux/amd64
make npm_licenses
make common-docker-amd64
Using Prometheus as a Go Library
Remote Write
We are publishing our Remote Write protobuf independently at buf.build.
You can use that as a library:
go get buf.build/gen/go/prometheus/prometheus/protocolbuffers/go@latest
This is experimental.
Prometheus code base
In order to comply with go mod rules, Prometheus release number do not exactly match Go module releases.
For the Prometheus v3.y.z releases, we are publishing equivalent v0.3y.z tags. The y in v0.3y.z is always padded to two digits, with a leading zero if needed.
Therefore, a user that would want to use Prometheus v3.0.0 as a library could do:
go get github.com/prometheus/prometheus@v0.300.0
For the Prometheus v2.y.z releases, we published the equivalent v0.y.z tags.
Therefore, a user that would want to use Prometheus v2.35.0 as a library could do:
go get github.com/prometheus/prometheus@v0.35.0
This solution makes it clear that we might break our internal Go APIs between minor user-facing releases, as breaking changes are allowed in major version zero.
React UI Development
For more information on building, running, and developing on the React-based UI, see the React app's README.md.
More information
- Godoc documentation is available via pkg.go.dev. Due to peculiarities of Go Modules, v3.y.z will be displayed as v0.3y.z (the y in v0.3y.z is always padded to two digits, with a leading zero if needed), while v2.y.z will be displayed as v0.y.z.
- See the Community page for how to reach the Prometheus developers and users on various communication channels.
Contributing
Refer to CONTRIBUTING.md
License
Apache License 2.0, see LICENSE.