- Resolves bottleneck in internal API server communication that can cause increased goroutines and degrade API Server performance ([#80465](https://github.com/kubernetes/kubernetes/pull/80465), [@answer1991](https://github.com/answer1991))

- Resolved a performance issue in the node authorizer index maintenance. ([#87693](https://github.com/kubernetes/kubernetes/pull/87693), [@liggitt](https://github.com/liggitt)) [SIG Auth]

### Feature

- A ValidatingAdmissionPolicy now has its `messageExpression` field checked against resolved types. ([#119209](https://github.com/kubernetes/kubernetes/pull/119209), [@jiahuif](https://github.com/jiahuif)) [SIG API Machinery]

For more information and for updates on resolution of this issue, see [#51899](https://github.com/kubernetes/kubernetes/issues/51899).

* fix get azure accounts timeout issue when there is no out-bound IP ([#74191](https://github.com/kubernetes/kubernetes/pull/74191), [@andyzhangx](https://github.com/andyzhangx))
* kubelet: resolved hang/timeout issues when running large numbers of pods with unique configmap/secret references ([#74755](https://github.com/kubernetes/kubernetes/pull/74755), [@liggitt](https://github.com/liggitt))

*   Relative paths in the Kubelet's local config files (`--init-config-dir`) will now be resolved relative to the location of the containing files. ([#55648](https://github.com/kubernetes/kubernetes/pull/55648),[ @mtaufen](https://github.com/mtaufen))

- Resolve a "concurrent map read and map write" crashing error in the kubelet ([#95111](https://github.com/kubernetes/kubernetes/pull/95111), [@choury](https://github.com/choury)) [SIG Node]

- Resolves a spurious "Unknown discovery response content-type" error in client-go discovery requests by tolerating extra content-type parameters in API responses ([#117637](https://github.com/kubernetes/kubernetes/pull/117637), [@seans3](https://github.com/seans3))...

* Fix user visible files creation for windows ([#62375](https://github.com/kubernetes/kubernetes/pull/62375), [@feiskyer](https://github.com/feiskyer))
* Resolves forbidden error when the `daemon-set-controller` cluster role access `controllerrevisions` resources. ([#62146](https://github.com/kubernetes/kubernetes/pull/62146), [@frodenas](https://github.com/frodenas))

* Prevent AWS Network Load Balancer security groups ingress rules to be deleted by ensuring target groups are tagged. ([#73594](https://github.com/kubernetes/kubernetes/pull/73594), [@masterzen](https://github.com/masterzen))
* kubelet: resolved hang/timeout issues when running large numbers of pods with unique configmap/secret references ([#74755](https://github.com/kubernetes/kubernetes/pull/74755), [@liggitt](https://github.com/liggitt))