- CEL authorizer checks no longer raise runtime errors. Calls to "check" will always return a decision object and the authorization error (if any) can be accessed within expressions using the new decision methods "errored" and "error". ([#118804](https://github.com/kubernetes/kubernetes/pull/118804), [@benluddy](https://github.com/benluddy)) [SIG API Machinery]

  * Authorization sets `authorization.k8s.io/decision` and `authorization.k8s.io/reason` annotations with the authorization decision ("allow" or "forbid") and a human-readable description of why the decision was made (for example, RBAC includes the name of the role/binding/subject which allowed a request).

    * Scale up forbidden window was protecting HPA against making decision to scale up based on metrics gathered during pod initialisation (which may be invalid, for example pod may be using a lot of CPU despite not doing any "actual" work).

* Removes Priority Admission Controller from kubeadm since it's alpha.  ([#55237](https://github.com/kubernetes/kubernetes/pull/55237), [@andrewsykim](https://github.com/andrewsykim))
* Add support for the webhook authorizer to make a Deny decision that short-circuits the union authorizer and immediately returns Deny.  ([#53273](https://github.com/kubernetes/kubernetes/pull/53273), [@mikedanese](https://github.com/mikedanese))

* Fixed issue 63608, which is that under rare circumstances the ResourceQuota admission controller could lose track of an request in progress and time out after waiting 10 seconds for a decision to be made. ([#64598](https://github.com/kubernetes/kubernetes/pull/64598), [@MikeSpreitzer](https://github.com/MikeSpreitzer))

- Clean ReplicaSet by revision instead of creation timestamp in deployment controller ([#97407](https://github.com/kubernetes/kubernetes/pull/97407), [@waynepeking348](https://github.com/waynepeking348)) [SIG Apps]

- Fixed a regression in the pod binding subresource to honor the `metadata.uid` precondition.
  This allows kube-scheduler to ensure it is assigns node names to the same instances of pods it made scheduling decisions for. ([#116550](https://github.com/kubernetes/kubernetes/pull/116550), [@alculquicondor](https://github.com/alculquicondor))

### Serverside Apply - Beta 2

- `kubectl rollout undo` now returns errors when attempting to rollback a deployment to a non-existent revision ([#70039](https://github.com/kubernetes/kubernetes/pull/70039), [@liggitt](https://github.com/liggitt))

- Kubectl rollout history sts/sts-name --revision=some-revision will start showing the detailed view of  the sts on that specified revision ([#86506](https://github.com/kubernetes/kubernetes/pull/86506), [@dineshba](https://github.com/dineshba)) [SIG CLI]