- Fixed an issue with missing `apiVersion/kind` in object data sent to admission webhooks ([#74448](https://github.com/kubernetes/kubernetes/pull/74448), [@liggitt](https://github.com/liggitt))

    ```yaml
    kind: NetworkPolicy
    apiVersion: networking.k8s.io/v1
    metadata:
      name: default-deny
    spec:
      podSelector:
    ```

  * The audit log file defaults to JSON encoding when using the advanced auditing feature gate.
  * An audit policy file without either an `apiVersion` or a `kind` field may be treated as invalid.
  * The webhook and log file now output the `v1beta1` event format.

*   The API group/version for the kube-proxy configuration has changed from `componentconfig/v1alpha1` to `kubeproxy.config.k8s.io/v1alpha1`. If you are using a config file for kube-proxy instead of the command line flags, you must change its apiVersion to `kubeproxy.config.k8s.io/v1alpha1`. ([#53645](https://github.com/kubernetes/kubernetes/pull/53645), [@xiangpengzhao](https://github.com/xiangpengzhao))

### API Change

- Change the APIVersion proto name of BoundObjectRef from aPIVersion to apiVersion. ([#97379](https://github.com/kubernetes/kubernetes/pull/97379), [@kebe7jun](https://github.com/kebe7jun)) [SIG Auth]
- Promote Immutable Secrets/ConfigMaps feature to Stable.

- Fix `kubectl drain ignore` daemonsets and others. ([#87361](https://github.com/kubernetes/kubernetes/pull/87361), [@zhouya0](https://github.com/zhouya0)) [SIG CLI]
- Fix missing "apiVersion" for "involvedObject" in Events for Nodes. ([#87537](https://github.com/kubernetes/kubernetes/pull/87537), [@uthark](https://github.com/uthark)) [SIG Apps and Node]

* `v1beta1` RoleBinding/ClusterRoleBinding subjects changed `apiVersion` to `apiGroup` to fully-qualify a subject. ServiceAccount subjects default to an apiGroup of `""`, User and Group subjects default to an apiGroup of `"rbac.authorization.k8s.io"`. ([#41184](https://github.com/kubernetes/kubernetes/pull/41184), ...

- kubeadm: Added support for machine-readable output with `-o yaml` and `-o json` to the command `kubeadm certs check-expiration`. This change is introduced in a new API: ``` kind: CertificateExpirationInfo apiVersion: output.kubeadm.k8s.io/v1alpha3 ``` The existing non-structured formatting is preserved. The output API version v1alpha2 is now deprecated and will be removed in a future release. Please migrate to using v1alpha3.

  
  ---
  apiVersion: admissionregistration.k8s.io/v1
  kind: ValidatingAdmissionPolicy
  metadata:
    name: "servicecidrs.default"
  spec:
    failurePolicy: Fail
    matchConstraints:
      resourceRules:

- Validated APIVersion fields of the `HorizontalPodAutoscaler` to ensure that API objects were created and functioned properly. ([#132537](https://github.com/kubernetes/kubernetes/pull/132537), [@lalitc375](https://github.com/lalitc375)) [SIG Etcd and Testing]