- Fixed bug where providing a FieldPath to a CRD Validation Rule would erroneously affect the reported field path of other unrelated CRD Validation Rules on the same schema. ([#123475](https://github.com/kubernetes/kubernetes/pull/123475), [@alexzielenski](https://github.com/alexzielenski))

## Changelog since v1.27.5

## Changes by Kind

### API Change

- Fixed a bug where CEL expressions in CRD validation rules would incorrectly compute a high estimated cost for functions that return strings, lists or maps.

    - [<code>CSIMigrationvSphere</code> feature gate has not migrated to new CRD APIs](#csimigrationvsphere-feature-gate-has-not-migrated-to-new-crd-apis)
    - [Workloads that saturate nodes with pods may see pods that fail due to node admission](#workloads-that-saturate-nodes-with-pods-may-see-pods-that-fail-due-to-node-admission)

### Bug or Regression

- Fix nil pointer panic in BuildOpenAPIV2 and BuildOpenAPIV3 utilities, used by kube-apiserver's openAPI controller, when a CRD is missing version the requested version. ([#128940](https://github.com/kubernetes/kubernetes/pull/128940), [@jpbetz](https://github.com/jpbetz)) [SIG API Machinery]

### Other notable changes

* Fix creation of custom resources when the CRD contains non-conventional pluralization and subresources ([#66249](https://github.com/kubernetes/kubernetes/pull/66249), [@deads2k](https://github.com/deads2k))

- Fixed a bug in ValidatingAdmissionPolicy that caused policies which were using CRD parameters to fail to synchronize ([#123003](https://github.com/kubernetes/kubernetes/pull/123003), [@alexzielenski](https://github.com/alexzielenski)) [SIG API Machinery and Testing]

### Promoted CRD Validation Expression Language to Beta

* Add generate-groups.sh and generate-internal-groups.sh to k8s.io/code-generator to easily run generators against CRD or User API Server types. ([#52186](https://github.com/kubernetes/kubernetes/pull/52186), [@sttts](https://github.com/sttts))

## Changelog since v1.20.11

## Changes by Kind

### API Change

- Kube-apiserver: Fixes handling of CRD schemas containing literal null values in enums (#104990, @liggitt) [SIG API Machinery, Apps and Network]

### Bug or Regression

* fixes kubefed's ability to create RBAC roles in version-skewed clusters ([#50537](https://github.com/kubernetes/kubernetes/pull/50537), [@liggitt](https://github.com/liggitt))
* Fix data race during addition of new CRD ([#50098](https://github.com/kubernetes/kubernetes/pull/50098), [@nikhita](https://github.com/nikhita))