* The kube-apiserver openapi doc now includes extensions identifying `APIService` and `CustomResourceDefinition` `kind`s ([#64174](https://github.com/kubernetes/kubernetes/pull/64174), [@liggitt](https://github.com/liggitt))

- Added CEL runtime cost calculation into ValidatingAdmissionPolicy, matching the evaluation cost
  restrictions that already apply to CustomResourceDefinition.
  If rule evaluation uses more compute than the limit, the API server aborts the evaluation and the
  admission check that was being performed is aborted; the `failurePolicy` for the ValidatingAdmissionPolicy

* Set node external IP for azure node when disabling UseInstanceMetadata ([#60959](https://github.com/kubernetes/kubernetes/pull/60959), [@feiskyer](https://github.com/feiskyer))
* Fixes potential deadlock when deleting CustomResourceDefinition for custom resources with finalizers ([#60542](https://github.com/kubernetes/kubernetes/pull/60542), [@liggitt](https://github.com/liggitt))

### **Kubernetes API**
#### User Provided Extensions
* [beta] ThirdPartyResource is deprecated. Please migrate to the successor, CustomResourceDefinition. For more information, see [Custom Resources](https://kubernetes.io/docs/concepts/api-extension/custom-resources/) and [Migrate a ThirdPartyResource to CustomResourceDefinition](https://kubernetes.io/docs/tasks/access-kubernetes-api/migrate-third-party-resource/).

### API Change

- Fix spurious kube-apiserver log warnings related to openapi v3 merging when creating or modifying CustomResourceDefinition objects ([#109880](https://github.com/kubernetes/kubernetes/pull/109880), [@Jefftree](https://github.com/Jefftree)) [SIG API Machinery and Testing]

* kubeadm: improved RequiredIPVSKernelModulesAvailable warning message ([#74033](https://github.com/kubernetes/kubernetes/pull/74033), [@bart0sh](https://github.com/bart0sh))
* Add `nullable` support to CustomResourceDefinition OpenAPI validation schemata. ([#74804](https://github.com/kubernetes/kubernetes/pull/74804), [@sttts](https://github.com/sttts))

- The metrics `etcd_request_duration_seconds` and `etcd_bookmark_counts` now differentiate by group resource instead of object type, allowing unique entries per `CustomResourceDefinition`, instead of grouping them all under `*unstructured.Unstructured`. ([#112042](https://github.com/kubernetes/kubernetes/pull/112042), [@ncdc](https://github.com/ncdc))

* Added block volume support to Cinder volume plugin. ([#64879](https://github.com/kubernetes/kubernetes/pull/64879), [@bertinatto](https://github.com/bertinatto))
* fixed incorrect OpenAPI schema for CustomResourceDefinition objects ([#65256](https://github.com/kubernetes/kubernetes/pull/65256), [@liggitt](https://github.com/liggitt))

- Kube-apiserver: fix a possible panic validating a custom resource whose CustomResourceDefinition indicates a status subresource exists, but which does not define a `status` property in the `openAPIV3Schema` ([#135362](https://github.com/kubernetes/kubernetes/pull/135362), [@fusida](https://github.com/fusida)) [SIG API Machinery]