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Update release policy (#5749)

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RELEASE.md
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@ -4,29 +4,32 @@ The Kubespray Project is released on an as-needed basis. The process is as follo
1. An issue is proposing a new release with a changelog since the last release 1. An issue is proposing a new release with a changelog since the last release
2. At least one of the [approvers](OWNERS_ALIASES) must approve this release 2. At least one of the [approvers](OWNERS_ALIASES) must approve this release
3. An approver creates [new release in GitHub](https://github.com/kubernetes-sigs/kubespray/releases/new) using a version and tag name like `vX.Y.Z` and attaching the release notes 3. The `kube_version_min_required` variable is set to `n-1`
4. An approver creates a release branch in the form `release-X.Y` 4. An approver creates [new release in GitHub](https://github.com/kubernetes-sigs/kubespray/releases/new) using a version and tag name like `vX.Y.Z` and attaching the release notes
5. The corresponding version of [quay.io/kubespray/kubespray:vX.Y.Z](https://quay.io/repository/kubespray/kubespray) docker image is built and tagged 5. An approver creates a release branch in the form `release-X.Y`
6. The `KUBESPRAY_VERSION` variable is updated in `.gitlab-ci.yml` 6. The corresponding version of [quay.io/kubespray/kubespray:vX.Y.Z](https://quay.io/repository/kubespray/kubespray) docker image is built and tagged
7. The release issue is closed 7. The `KUBESPRAY_VERSION` variable is updated in `.gitlab-ci.yml`
8. An announcement email is sent to `kubernetes-dev@googlegroups.com` with the subject `[ANNOUNCE] Kubespray $VERSION is released` 8. The release issue is closed
9. The topic of the #kubespray channel is updated with `vX.Y.Z is released! | ...` 9. An announcement email is sent to `kubernetes-dev@googlegroups.com` with the subject `[ANNOUNCE] Kubespray $VERSION is released`
10. The topic of the #kubespray channel is updated with `vX.Y.Z is released! | ...`
## Major/minor releases, merge freezes and milestones ## Major/minor releases and milestones
* Kubespray maintains one branch for major releases (vX.Y). Minor releases are available only as tags. * For major releases (vX.Y) Kubespray maintains one branch (`release-X.Y`). Minor releases (vX.Y.Z) are available only as tags.
* Security patches and bugs might be backported. * Security patches and bugs might be backported.
* Fixes for major releases (vX.x.0) and minor releases (vX.Y.x) are delivered * Fixes for major releases (vX.Y) and minor releases (vX.Y.Z) are delivered
via maintenance releases (vX.Y.Z) and assigned to the corresponding open via maintenance releases (vX.Y.Z) and assigned to the corresponding open
milestone (vX.Y). That milestone remains open for the major/minor releases [GitHub milestone](https://github.com/kubernetes-sigs/kubespray/milestones).
support lifetime, which ends once the milestone closed. Then only a next major That milestone remains open for the major/minor releases support lifetime,
or minor release can be done. which ends once the milestone is closed. Then only a next major or minor release
can be done.
* Kubespray major and minor releases are bound to the given ``kube_version`` major/minor * Kubespray major and minor releases are bound to the given `kube_version` major/minor
version numbers and other components' arbitrary versions, like etcd or network plugins. version numbers and other components' arbitrary versions, like etcd or network plugins.
Older or newer versions are not supported and not tested for the given release. Older or newer component versions are not supported and not tested for the given
release (even if included in the checksum variables, like `kubeadm_checksums`).
* There is no unstable releases and no APIs, thus Kubespray doesn't follow * There is no unstable releases and no APIs, thus Kubespray doesn't follow
[semver](https://semver.org/). Every version describes only a stable release. [semver](https://semver.org/). Every version describes only a stable release.
@ -36,9 +39,9 @@ The Kubespray Project is released on an as-needed basis. The process is as follo
considered out of Kubespray scope and are up to the components' teams to deal with and considered out of Kubespray scope and are up to the components' teams to deal with and
document. document.
* Minor releases can change components' versions, but not the major ``kube_version``. * Minor releases can change components' versions, but not the major `kube_version`.
Greater ``kube_version`` requires a new major or minor release. For example, if Kubespray v2.0.0 Greater `kube_version` requires a new major or minor release. For example, if Kubespray v2.0.0
is bound to ``kube_version: 1.4.x``, ``calico_version: 0.22.0``, ``etcd_version: v3.0.6``, is bound to `kube_version: 1.4.x`, `calico_version: 0.22.0`, `etcd_version: v3.0.6`,
then Kubespray v2.1.0 may be bound to only minor changes to ``kube_version``, like v1.5.1 then Kubespray v2.1.0 may be bound to only minor changes to `kube_version`, like v1.5.1
and *any* changes to other components, like etcd v4, or calico 1.2.3. and *any* changes to other components, like etcd v4, or calico 1.2.3.
And Kubespray v3.x.x shall be bound to ``kube_version: 2.x.x`` respectively. And Kubespray v3.x.x shall be bound to `kube_version: 2.x.x` respectively.