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🌱 Update CAPI support and guarantees for v1.9 #11151

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🌱 Update CAPI support and guarantees for v1.9 #11151

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1 change: 1 addition & 0 deletions CONTRIBUTING.md
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Expand Up @@ -140,6 +140,7 @@ Cluster API maintains the most recent release/releases for all supported API and

| Minor Release | API Version | Supported Until |
|---------------|--------------|------------------------------------------------|
| v1.9.x | **v1beta1** | when v1.11.0 will be released |
| v1.8.x | **v1beta1** | when v1.10.0 will be released |
| v1.7.x | **v1beta1** | when v1.9.0 will be released |
| v1.6.x | **v1beta1** | EOL since 2024-08-12 - v1.8.0 release date |
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65 changes: 31 additions & 34 deletions docs/book/src/reference/versions.md
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Expand Up @@ -74,18 +74,17 @@ These diagrams show the relationships between components in a Cluster API releas

#### Core Provider (`cluster-api-controller`)

| | v1.5 (v1beta1) (EOL) | v1.6 (v1beta1) | v1.7 (v1beta1) | v1.8 (v1beta1) |
| | v1.6 (v1beta1) (EOL) | v1.7 (v1beta1) | v1.8 (v1beta1) | v1.9 (v1beta1) |
|-------------------|----------------------|-------------------|-------------------|-------------------|
| Kubernetes v1.22 | ✓ (only workload) | | | |
| Kubernetes v1.23* | ✓ (only workload) | ✓ (only workload) | | |
| Kubernetes v1.24 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.25 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
| Kubernetes v1.26 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.27 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.28 | ✓ >= v1.5.1 | ✓ | ✓ | ✓ |
| Kubernetes v1.29 | | ✓ >= v1.6.1 | ✓ | ✓ |
| Kubernetes v1.30 | | | ✓ >= v1.7.1 | ✓ |
| Kubernetes v1.31 | | | | ✓ >= v1.8.1 |
| Kubernetes v1.23* | ✓ (only workload) | | | |
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Table formatting seems off (same for other changes)

| Kubernetes v1.24 | ✓ (only workload) | ✓ (only workload) | | |
| Kubernetes v1.25 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.26 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
| Kubernetes v1.27 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.28 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.29 | ✓ >= v1.6.1 | ✓ | ✓ | ✓ |
| Kubernetes v1.30 | | ✓ >= v1.7.1 | ✓ | ✓ |
| Kubernetes v1.31 | | | ✓ >= v1.8.1 | ✓ |


\* There is an issue with CRDs in Kubernetes v1.23.{0-2}. ClusterClass with patches is affected by that (for more details please see [this issue](https://github.com/kubernetes-sigs/cluster-api/issues/5990)). Therefore we recommend to use Kubernetes v1.23.3+ with ClusterClass.
Expand All @@ -95,35 +94,33 @@ The Core Provider also talks to API server of every Workload Cluster. Therefore,

#### Kubeadm Bootstrap Provider (`kubeadm-bootstrap-controller`)

| | v1.5 (v1beta1) (EOL) | v1.6 (v1beta1) | v1.7 (v1beta1) | v1.8 (v1beta1) |
|------------------------------------|----------------------|--------------------|--------------------|--------------------|
| Kubernetes v1.22 + kubeadm/v1beta3 | ✓ (only workload) | | | |
| Kubernetes v1.23 + kubeadm/v1beta3 | ✓ (only workload) | ✓ (only workload) | | |
| Kubernetes v1.24 + kubeadm/v1beta3 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.25 + kubeadm/v1beta3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
| Kubernetes v1.26 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.27 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.28 + kubeadm/v1beta3 | ✓ >= v1.5.1 | ✓ | ✓ | ✓ |
| Kubernetes v1.29 + kubeadm/v1beta3 | | ✓ >= v1.6.1 | ✓ | ✓ |
| Kubernetes v1.30 + kubeadm/v1beta3 | | | ✓ >= v1.7.1 | ✓ |
| Kubernetes v1.31 + kubeadm/v1beta4 | | | | ✓ >= v1.8.1 |
| | v1.6 (v1beta1) (EOL) | v1.7 (v1beta1) | v1.8 (v1beta1) | v1.9 (v1beta1)
|------------------------------------|----------------------|-------------------|-------------------|-------------------|
| Kubernetes v1.23 + kubeadm/v1beta3 | ✓ (only workload) | | | |
| Kubernetes v1.24 + kubeadm/v1beta3 | ✓ (only workload) | ✓ (only workload) | | |
| Kubernetes v1.25 + kubeadm/v1beta3 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.26 + kubeadm/v1beta3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
| Kubernetes v1.27 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.28 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.29 + kubeadm/v1beta3 | ✓ >= v1.6.1 | ✓ | ✓ | ✓ |
| Kubernetes v1.30 + kubeadm/v1beta3 | | ✓ >= v1.7.1 | ✓ | ✓ |
| Kubernetes v1.31 + kubeadm/v1beta4 | | | ✓ >= v1.8.1 | ✓ |

The Kubeadm Bootstrap Provider generates kubeadm configuration using the API version recommended for the target Kubernetes version.

#### Kubeadm Control Plane Provider (`kubeadm-control-plane-controller`)

| | v1.5 (v1beta1) (EOL) | v1.6 (v1beta1) | v1.7 (v1beta1) | v1.8 (v1beta1) |
| | v1.6 (v1beta1) (EOL) | v1.7 (v1beta1) | v1.8 (v1beta1) | v1.9 (v1beta1)
|----------------------------|----------------------|-------------------|-------------------|-------------------|
| Kubernetes v1.22 + etcd/v3 | ✓ (only workload) | | | |
| Kubernetes v1.23 + etcd/v3 | ✓ (only workload) | ✓ (only workload) | | |
| Kubernetes v1.24 + etcd/v3 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.25 + etcd/v3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
| Kubernetes v1.26 + etcd/v3 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.27 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.28 + etcd/v3 | ✓ >= v1.5.1 | ✓ | ✓ | ✓ |
| Kubernetes v1.29 + etcd/v3 | | ✓ >= v1.6.1 | ✓ | ✓ |
| Kubernetes v1.30 + etcd/v3 | | | ✓ >= v1.7.1 | ✓ |
| Kubernetes v1.31 + etcd/v3 | | | | ✓ >= v1.8.1 |
| Kubernetes v1.23 + etcd/v3 | ✓ (only workload) | | | |
| Kubernetes v1.24 + etcd/v3 | ✓ (only workload) | ✓ (only workload) | | |
| Kubernetes v1.25 + etcd/v3 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.26 + etcd/v3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
| Kubernetes v1.27 + etcd/v3 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.28 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.29 + etcd/v3 | ✓ >= v1.6.1 | ✓ | ✓ | ✓ |
| Kubernetes v1.30 + etcd/v3 | | ✓ >= v1.7.1 | ✓ | ✓ |
| Kubernetes v1.31 + etcd/v3 | | | ✓ >= v1.8.1 | ✓ |

The Kubeadm Control Plane Provider talks to the API server and etcd members of every Workload Cluster whose control plane it owns. It uses the etcd v3 API.

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