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Release schedule

Following Prometheus and Thanos, this project aims for a predictable release schedule.

Release cadence of first pre-releases being cut is 6 weeks.

Release Date of first pre-release (year-month-day) Release shepherd
v0.39 2020-05-06 Pawel Krupa (GitHub: @paulfantom)
v0.40 2020-06-17 Lili Cosic (GitHub: @lilic)
v0.41 2020-07-29 Sergiusz Urbaniak (GitHub: @s-urbaniak)
v0.42 2020-09-09 Matthias Loibl (GitHub: @metalmatze)
v0.43 2020-10-21 Simon Pasquier (GitHub: @simonpasquier)
v0.44 2020-12-02 Pawel Krupa (GitHub: @paulfantom)
v0.45 2021-01-13 Lili Cosic (GitHub: @lilic)
v0.46 2021-02-24 searching for volunteer

How to cut a new release

This guide is strongly based on the Prometheus release instructions.

Branch management and versioning strategy

We use Semantic Versioning.

We maintain a separate branch for each minor release, named release-<major>.<minor>, e.g. release-1.1, release-2.0.

The usual flow is to merge new features and changes into the master branch and to merge bug fixes into the latest release branch. Bug fixes are then merged into master from the latest release branch. The master branch should always contain all commits from the latest release branch.

If a bug fix got accidentally merged into master, cherry-pick commits have to be created in the latest release branch, which then have to be merged back into master. Try to avoid that situation.

Maintaining the release branches for older minor releases happens on a best effort basis.

Update Go dependencies

A couple of days before the release, consider submitting a PR against the master branch to update the Go dependencies.

Update operand versions

A couple of days before the release, update the default versions of Prometheus, Alertmanager and Thanos if newer versions are available.

Prepare your release

For a new major or minor release, work from the master branch. For a patch release, work in the branch of the minor release you want to patch (e.g. release-0.43 if you're releasing v0.43.2).

Bump the version in the VERSION file in the root of the repository.

A number of files have to be re-generated, this is automated with the following make target:

$ make clean generate

Bump the version of the pkg/apis/monitoring and pkg/client packages in go.mod:

$ go mod edit -require "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring@v$(< VERSION)"
$ go mod edit -require "github.com/prometheus-operator/prometheus-operator/pkg/client@v$(< VERSION)"

Now that all version information has been updated, an entry for the new version can be added to the CHANGELOG.md file.

Entries in the CHANGELOG.md are meant to be in this order:

  • [CHANGE]
  • [FEATURE]
  • [ENHANCEMENT]
  • [BUGFIX]

Create a PR for the changes to be reviewed.

Publish the new release

For new minor and major releases, create the release-<major>.<minor> branch starting at the PR merge commit.

From now on, all work happens on the release-<major>.<minor> branch.

Tag the new release with a tag named v<major>.<minor>.<patch>, e.g. v2.1.3. Note the v prefix. Tag also the github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring module with pkg/apis/monitoring/v<major>.<minor>.<patch> and the github.com/prometheus-operator/prometheus-operator/pkg/client module with pkg/client/v<major>.<minor>.<patch>. You can do the tagging on the commandline:

$ tag="v$(< VERSION)"
$ git tag -s "${tag}" -m "${tag}"
$ git tag -s "pkg/apis/monitoring/${tag}" -m "pkg/apis/monitoring/${tag}"
$ git tag -s "pkg/client/${tag}" -m "pkg/client/${tag}"
$ git push origin "${tag}" "pkg/apis/monitoring/${tag}" "pkg/client/${tag}"

Signed tag with a GPG key is appreciated, but in case you can't add a GPG key to your Github account using the following procedure, you can replace the -s flag by -a flag of the git tag command to only annotate the tag without signing.

Our CI pipeline will automatically push the container images to quay.io.

Go to https://github.com/prometheus-operator/prometheus-operator/releases/new, associate the new release with the before pushed tag, paste in changes made to CHANGELOG.md and click "Publish release".

For patch releases, submit a pull request to merge back the release branch into the master branch.

Update kube-prometheus

Bump the versions of github.com/prometheus-operator/prometheus-operator in prometheus-operator/kube-prometheus (see this pull request for example).

Take a breath. You're done releasing.