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Contribute

Loki uses GitHub to manage reviews of pull requests:

  • If you have a trivial fix or improvement, go ahead and create a pull request.
  • If you plan to do something more involved, discuss your ideas on the relevant GitHub issue.
  • Make sure to follow the prerequisites below before marking your PR as ready for review.

Pull Request Prerequisites/Checklist

  1. Your PR title is in the form <Feature Area>: Your change.
    1. It does not end the title with punctuation. It will be added in the changelog.
    2. It starts with an imperative verb. Example: Fix the latency between System A and System B.
    3. It uses Sentence case, not Title Case.
    4. It uses a complete phrase or sentence. The PR title will appear in a changelog, so help other people understand what your change will be.
    5. It has a clear description saying what it does and why. Your PR description will be present in the project' commit log, so be gentle to it.
  2. Your PR is well sync'ed with main
  3. Your PR is correctly documenting appropriate changes under the CHANGELOG. You should document your changes there if:
    • It adds an important feature
    • It fixes an issue present in a previous release
    • It causes a change in operation that would be useful for an operator of Loki to know
    • You can skip this step for documentation changes, build related changes and simple bug fixes or enhancements. Rationale being we are attempting to curate the CHANGELOG entries with most relevant and important changes that end users of Loki care about.
  4. Your PR documents upgrading steps under docs/sources/upgrading/_index.md if it changes:
    • Default configuration values
    • Metric names or label names
    • Changes existing log lines that may be used in dashboard or alerts. e.g: logs lines in any metrics.go files might be getting used in building dashboards or alerts.
    • Configuration parameters
    • Any breaking changes to HTTP or gRPC API endpoints
    • Any other change that would require special attention or extra steps to upgrade

Please document clearly what changed AND what needs to be done in the upgrade guide.

Setup

A common problem arises in local environments when you want your module to use a locally modified dependency: How do you make Go understand you don't want to fetch upstream dependencies but use local ones? You could modify go.mod and use replace directives, but it's highly harming Developer Experience as you need to roll back your go.mod before committing.

Things get even worse when you host multiple modules on the same repository as Go will ignore modifications made locally to a module B when building a dependent module A. Below are some solutions you can use if you happen to stumble on those problems.

Go 1.18 workspaces

$ git clone <FORK_URL>
$ go work init     # Init your go.work file
$ go work use -r . # Recursively add sub-modules in the use clause of your go.work file

Since Go 1.18, we are able to launch build commands in a mode called workspace. Conceptually, a workspace is an untracked file adding replace directives to your go.mod at runtime. By default, Go will use the workspace mode when a go.work file is present, but you can have different workspaces and specify which one to use with the GOWORK environment variable.

For more info, take a look at the Proposal and the Reference.

Go 1.17 vendor folder

Since Go 1.17, the vendor folder excludes go.mod file from dependencies and includes version information in modules.txt. The removal of go.mod files inside the folder means Go won't try to use the upstream version of our dependencies.

Prior to Go 1.18

Prior to Go 1.18, you would need to add your fork as a remote on the original $GOPATH/src/github.com/grafana/loki clone, so:

$ go get github.com/grafana/loki
$ cd $GOPATH/src/github.com/grafana/loki # GOPATH is $HOME/go by default.

$ git remote add <FORK_NAME> <FORK_URL>

Notice: go get return package github.com/grafana/loki: no Go files in /go/src/github.com/grafana/loki is normal.

Contribute to helm

Please follow the Loki Helm Chart.

Dependency management

We use Go modules to manage dependencies on external packages. This requires a working Go environment with version 1.15 or greater and git installed.

To add or update a new dependency, use the go get command:

# Pick the latest tagged release.
go get example.com/some/module/pkg

# Pick a specific version.
go get example.com/some/module/pkg@vX.Y.Z

Tidy up the go.mod and go.sum files:

go mod tidy
go mod vendor
git add go.mod go.sum vendor
git commit

You have to commit the changes to go.mod and go.sum before submitting the pull request.

Coding Standards

go imports

imports should follow std libs, externals libs and local packages format

Example

import (
	"fmt"
	"math"

	"github.com/prometheus/common/model"
	"github.com/prometheus/prometheus/pkg/labels"

	"github.com/grafana/loki/pkg/logproto"
	"github.com/grafana/loki/pkg/logql"
)