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Update CAPI support and guarantees for v1.6
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‎CONTRIBUTING.md‎

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@@ -164,8 +164,9 @@ Cluster API maintains the most recent release/releases for all supported API and
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| Minor Release | API Version | Supported Until |
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|---------------|--------------|-----------------------------------------------------|
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| v1.4.x | **v1beta1** | when v1.6.0 will be released |
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| v1.3.x | **v1beta1** | when v1.5.0 will be released, tentatively July 2023 |
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| v1.5.x | **v1beta1** | when v1.7.0 will be released |
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| v1.4.x | **v1beta1** | when v1.6.0 will be released, tentatively Nov 2023 |
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| v1.3.x | **v1beta1** | EOL since 2023-07-25 - v1.5.0 release date |
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| v1.2.x | **v1beta1** | EOL since 2023-03-28 - v1.4.0 release date |
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| v1.1.x | **v1beta1** | EOL since 2022-07-18 - v1.2.0 release date (*) |
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| v1.0.x | **v1beta1** | EOL since 2022-02-02 - v1.1.0 release date (*) |

‎docs/book/src/reference/versions.md‎

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@@ -72,18 +72,18 @@ These diagrams show the relationships between components in a Cluster API releas
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#### Core Provider (`cluster-api-controller`)
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| | v1.2 (v1beta1) (EOL) | v1.3 (v1beta1) | v1.4 (v1beta1) | v1.5 (v1beta1) |
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| | v1.3 (v1beta1) (EOL) | v1.4 (v1beta1) | v1.5 (v1beta1) | v1.6 (v1beta1) |
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|-------------------|----------------------|-------------------|-------------------|-------------------|
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| Kubernetes v1.18 | ✓ (only workload) | ✓ (only workload) | | |
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| Kubernetes v1.19 | ✓ (only workload) | ✓ (only workload) | | |
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| Kubernetes v1.20 | ✓ | ✓ | | |
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| Kubernetes v1.21 | ✓ | ✓ | ✓ (only workload) | |
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| Kubernetes v1.22 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.23* | ✓ | ✓ | ✓ | ✓ (only workload) |
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| Kubernetes v1.18 | ✓ (only workload) | | | |
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| Kubernetes v1.19 | ✓ (only workload) | | | |
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| Kubernetes v1.20 | ✓ | | | |
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| Kubernetes v1.21 | ✓ | ✓ (only workload) | | |
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| Kubernetes v1.22 | ✓ | ✓ (only workload) | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.23* | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.24 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.25 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.26 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.27 | | | ✓ | ✓ |
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| Kubernetes v1.27 | | ✓ | ✓ | ✓ |
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\* 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.
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#### Kubeadm Bootstrap Provider (`kubeadm-bootstrap-controller`)
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| | v1.2 (v1beta1) (EOL) | v1.3 (v1beta1) | v1.4 (v1beta1) | v1.5 (v1beta1) |
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|------------------------------------|----------------------|-------------------|--------------------|--------------------|
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| Kubernetes v1.18 + kubeadm/v1beta2 | ✓ (only workload) | ✓ (only workload) | | |
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| Kubernetes v1.19 + kubeadm/v1beta2 | ✓ (only workload) | ✓ (only workload) | | |
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| Kubernetes v1.20 + kubeadm/v1beta2 | ✓ | ✓ | | |
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| Kubernetes v1.21 + kubeadm/v1beta2 | ✓ | ✓ | ✓ (only workload) | |
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| Kubernetes v1.22 + kubeadm/v1beta3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.23 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ (only workload) |
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| Kubernetes v1.24 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.25 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.26 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.27 + kubeadm/v1beta3 | | | ✓ | ✓ |
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| | v1.3 (v1beta1) (EOL) | v1.4 (v1beta1) | v1.5 (v1beta1) | v1.6 (v1beta1) |
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|------------------------------------|----------------------|--------------------|--------------------|--------------------|
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| Kubernetes v1.18 + kubeadm/v1beta2 | ✓ (only workload) | | | |
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| Kubernetes v1.19 + kubeadm/v1beta2 | ✓ (only workload) | | | |
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| Kubernetes v1.20 + kubeadm/v1beta2 | ✓ | | | |
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| Kubernetes v1.21 + kubeadm/v1beta2 | ✓ | ✓ (only workload) | | |
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| Kubernetes v1.22 + kubeadm/v1beta3 | ✓ | ✓ (only workload) | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.23 + kubeadm/v1beta3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.24 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.25 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.26 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.27 + kubeadm/v1beta3 | | ✓ | ✓ | ✓ |
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The Kubeadm Bootstrap Provider generates kubeadm configuration using the API version recommended for the target Kubernetes version.
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#### Kubeadm Control Plane Provider (`kubeadm-control-plane-controller`)
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| | v1.2 (v1beta1) (EOL) | v1.3 (v1beta1) | v1.4 (v1beta1) | v1.5 (v1beta1) |
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| | v1.3 (v1beta1) (EOL) | v1.4 (v1beta1) | v1.5 (v1beta1) | v1.6 (v1beta1) |
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|----------------------------|----------------------|-------------------|-------------------|-------------------|
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| Kubernetes v1.18 + etcd/v3 | ✓ (only workload) | ✓ (only workload) | | |
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| Kubernetes v1.19 + etcd/v3 | ✓ (only workload) | ✓ (only workload) | | |
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| Kubernetes v1.20 + etcd/v3 | ✓ | ✓ | | |
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| Kubernetes v1.21 + etcd/v3 | ✓ | ✓ | ✓ (only workload) | |
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| Kubernetes v1.22 + etcd/v3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.23 + etcd/v3 | ✓ | ✓ | ✓ | ✓ (only workload) |
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| Kubernetes v1.18 + etcd/v3 | ✓ (only workload) | | | |
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| Kubernetes v1.19 + etcd/v3 | ✓ (only workload) | | | |
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| Kubernetes v1.20 + etcd/v3 | ✓ | | | |
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| Kubernetes v1.21 + etcd/v3 | ✓ | ✓ (only workload) | | |
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| Kubernetes v1.22 + etcd/v3 | ✓ | ✓ (only workload) | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.23 + etcd/v3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.24 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.25 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.26 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.27 + etcd/v3 | | | ✓ | ✓ |
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| Kubernetes v1.27 + etcd/v3 | | ✓ | ✓ | ✓ |
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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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| CAPI Version | Max CoreDNS Version for Upgrade |
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|----------------------|---------------------------------|
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| v1.2 (v1beta1) | v1.9.3 |
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| >= v1.2.7 (v1beta1) | v1.10.0 |
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| >= v1.2.11 (v1beta1) | v1.10.1 |
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| v1.3 (v1beta1) | v1.10.0 |
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| >= v1.3.4 (v1beta1) | v1.10.1 |
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| v1.4 (v1beta1) | v1.10.1 |
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| v1.5 (v1beta1) | v1.10.1 |
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#### Kubernetes version specific notes
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