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Update Kubernetes version matrix in release docs

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Allow specifying specific versions of containerd for Kubernetes releases
and clarify recommendations and support policy.

Signed-off-by: Derek McGowan <derek@mcg.dev>
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Derek McGowan 2022-05-03 21:04:47 -07:00
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RELEASES.md
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@ -105,7 +105,27 @@ The current state is available in the following tables:
| [1.6](https://github.com/containerd/containerd/releases/tag/v1.6.1) | Active | February 15, 2022 | max(February 15, 2023 or release of 1.7.0 + 6 months) |
| [1.7](https://github.com/containerd/containerd/milestone/42) | Next | TBD | TBD |
Note that branches and release from before 1.0 may not follow these rules.
### Kubernetes Support
The Kubernetes version matrix represents the versions of containerd which are
recommended for a Kubernetes release. Any actively supported version of
containerd may receive patches to fix bugs encountered in any version of
Kubernetes, however, our recommendation is based on which versions have been
the most thoroughly tested. See the [Kubernetes test grid](https://testgrid.k8s.io/sig-node-containerd)
for the list of actively tested versions. Kubernetes only supports n-3 minor
release versions and containerd will ensure there is always a supported version
of containerd for every supported version of Kubernetes.
| Kubernetes Version | containerd Version | CRI Version |
|--------------------|--------------------|--------------|
| 1.20 | 1.5 | v1alpha2 |
| 1.21 | 1.5 | v1alpha2 |
| 1.22 | 1.5.5+ | v1alpha2 |
| 1.23 | 1.6.0+, 1,5.8+ | v1, v1alpha2 |
| 1.24 | 1.6.4+, 1.5.11+ | v1, v1alpha2 |
Deprecated containerd and kubernetes versions
| CRI-Containerd Version | Containerd Version | Kubernetes Version | CRI Version |
|------------------------|--------------------|--------------------|--------------|
@ -115,12 +135,6 @@ Note that branches and release from before 1.0 may not follow these rules.
| | v1.2 (End-Of-Life) | 1.10+ | v1alpha2 |
| | v1.3 (End-Of-Life) | 1.12+ | v1alpha2 |
| | v1.4 (End-of-Life) | 1.19+ | v1alpha2 |
| | v1.5 | 1.20+ | v1alpha2 |
| | v1.6 | 1.23+ | v1, v1alpha2 |
**Note:** The support table above specifies the Kubernetes Version that was supported at time of release of the containerd - cri integration and Kubernetes only supports n-3 minor release versions.
These tables should be updated as part of the release preparation process.
### Backporting