* etcd3: dereference the UID pointer for a readable error message. ([#33349](https://github.com/kubernetes/kubernetes/pull/33349), [@madhusudancs](https://github.com/madhusudancs))
* etcd3: pass SelectionPredicate instead of Filter to storage layer ([#31190](https://github.com/kubernetes/kubernetes/pull/31190), [@hongchaodeng](https://github.com/hongchaodeng))

- Fixed a regression in default 1.26 configurations, which enabled PodDisruptionConditions by default, 

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- The `KubeletSeparateDiskGC` feature gate is now beta. This split image filesystem feature enables kubelet to perform garbage collection of images (read-only layers) and/or containers (writeable layers) deployed on separate filesystems. gate is now beta. ([#126205](https://github.com/kubernetes/kubernetes/pull/126205), [@kwilczynski](https://github.com/kwilczynski))

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- Fixed a regression in default configurations, which enabled PodDisruptionConditions by default, 

    *   Support for IPv6-only Kubernetes cluster deployments. **<span style="text-decoration:underline;">Note:</span>** This feature does not provide dual-stack support.
    *   Support for IPv6 Kubernetes control and data planes.
    *   Support for Kubernetes IPv6 cluster deployments using kubeadm.
    *   Support for the iptables kube-proxy backend using ip6tables.
    *   Relies on CNI 0.6.0 binaries for IPv6 pod networking.

- Add support for CEL expressions with escaped names in structured authentication config.  Using `[` for accessing claims or user data is preferred when names contain characters that would need to be escaped.  CEL optionals via `?` can be used in places where `has` cannot be used, i.e. `claims[?"kubernetes.io"]` or `user.extra[?"domain.io/foo"]`. ([#131574](https://github.com/kubernetes/kubernetes/pull/131574), [@enj](https://github.com/enj)) [SIG API Machinery and Auth]

Kubeadm: Automate certificate copy between control planes in HA setups

- Joining control plane nodes to a HA cluster can now be simplified by enabling the optional automatic copy of certificates from an existing control plane node.

### SIG API Machinery

[SIG API Machinery][] is responsible for all aspects of the API server: API registration and discovery, generic API CRUD semantics, admission control, encoding/decoding, conversion, defaulting, persistence layer (etcd), OpenAPI, third-party resources, garbage collection, and client libraries.