([#123179](https://github.com/kubernetes/kubernetes/pull/123179), [@aramase](https://github.com/aramase))
- Added feature gate `MutatingAdmissionPolicy` for enabling mutation policy in admission chain. ([#123425](https://github.com/kubernetes/kubernetes/pull/123425), [@cici37](https://github.com/cici37))

* The dynamic Kubelet config feature will now update the config in the event of a ConfigMap mutation, which reduces the chance for silent config skew. Only name, namespace, and kubeletConfigKey may now be set in `Node.Spec.ConfigSource.ConfigMap`. The least disruptive pattern for config management is still to create a new ConfigMap and incrementally...

 in your manifest. An object with a spec.selector value that does not match the labels in
 its spec.template is invalid.

 - Selector mutation is disabled for all kinds in the
 app/v1beta2 group version, because the controllers in the workloads API do not handle
 selector mutation in
 a consistent way. This restriction may be lifted in the future, but
 it is likely that that selectors will remain immutable after the move to v1.

### **API Machinery**

#### **Admission Control**

*   Admission webhooks are now in beta, and include the following:
    *   Mutation support for admission webhooks. ([#54892](https://github.com/kubernetes/kubernetes/pull/54892),[ @caesarxuchao](https://github.com/caesarxuchao))

- Kubeadm: retry `kubeadm-config` ConfigMap creation or mutation if the apiserver is not responding. This will improve resiliency when joining new control plane nodes. ([#85763](https://github.com/kubernetes/kubernetes/pull/85763), [@ereslibre](https://github.com/ereslibre)) [SIG Cluster Lifecycle]

- When updating a CRD, per-expression cost limit check are now skipped for `x-kubernetes-validations` rules of versions that are not mutated. ([#121460](https://github.com/kubernetes/kubernetes/pull/121460), [@jiahuif](https://github.com/jiahuif))
- `CSINodeExpandSecret` feature has been promoted to `GA` in this release and is enabled

- Setting a mirror pod's phase to Succeeded or Failed can prevent the corresponding static pod from restarting due mutation of a Kubelet cache. ([#116482](https://github.com/kubernetes/kubernetes/pull/116482), [@smarterclayton](https://github.com/smarterclayton)) [SIG Node]

### Other (Cleanup or Flake)

  * Roll up volume error messages in the kubelet sync loop. ([#44938](https://github.com/kubernetes/kubernetes/pull/44938), [@jayunit100](https://github.com/jayunit100))

  * Allow pods to opt out of PodPreset mutation via an annotation on the pod. ([#44965](https://github.com/kubernetes/kubernetes/pull/44965), [@jpeeler](https://github.com/jpeeler))

- Setting a mirror pod's phase to Succeeded or Failed can prevent the corresponding static pod from restarting due mutation of a Kubelet cache. ([#116482](https://github.com/kubernetes/kubernetes/pull/116482), [@smarterclayton](https://github.com/smarterclayton)) [SIG Node]

## Dependencies

### Added
_Nothing has changed._

- Setting a mirror pod's phase to Succeeded or Failed can prevent the corresponding static pod from restarting due mutation of a Kubelet cache. ([#116482](https://github.com/kubernetes/kubernetes/pull/116482), [@smarterclayton](https://github.com/smarterclayton)) [SIG Node]

### Other (Cleanup or Flake)