- Clients should reload the token from disk periodically (once per minute is recommended) to ensure they continue to use a valid token. `k8s.io/client-go` version v11.0.0+ and v0.15.0+ reload tokens automatically.

- Added warnings about workload resources (Pods, ReplicaSets, Deployments, Jobs, CronJobs, or ReplicationControllers) whose names are not valid DNS labels. ([#114412](https://github.com/kubernetes/kubernetes/pull/114412), [@thockin](https://github.com/thockin))

* Fixes bugs that make apiserver panic when aggregating valid but not well formed OpenAPI spec ([#63635](https://github.com/kubernetes/kubernetes/pull/63635), [@roycaihw](https://github.com/roycaihw))

- Client-go: make generated CA certificates valid 1 hour in the past (NewSelfSignedCACert). Applies to CA certificates and other certificates generated by kubeadm. ([#118631](https://github.com/kubernetes/kubernetes/pull/118631), [@champtar](https://github.com/champtar)) [SIG Auth]

- Fixed StatefulSet to show the valid status even if the new replica creation fails. ([#112084](https://github.com/kubernetes/kubernetes/pull/112084), [@gjkim42](https://github.com/gjkim42)) [SIG Apps and Testing]

- Fixed StatefulSet to show the valid status even if the new replica creation fails. ([#112083](https://github.com/kubernetes/kubernetes/pull/112083), [@gjkim42](https://github.com/gjkim42)) [SIG Apps and Testing]

- A value of `Auto` is now a valid for the `service.kubernetes.io/topology-aware-hints` annotation. ([#100728](https://github.com/kubernetes/kubernetes/pull/100728), [@robscott](https://github.com/robscott))

- Resolves an issue that causes winkernel proxier to treat stale VIPs as valid ([#113558](https://github.com/kubernetes/kubernetes/pull/113558), [@daschott](https://github.com/daschott)) [SIG Network and Windows]

  they do not contain invalid label values that will error at time of use. Existing
  invalid objects can be updated, but new objects are required to contain valid
  label selectors.'
   ([#113699](https://github.com/kubernetes/kubernetes/pull/113699), [@liggitt](https://github.com/liggitt))

  --> ([#119517](https://github.com/kubernetes/kubernetes/pull/119517), [@sanposhiho](https://github.com/sanposhiho)) [SIG Node, Scheduling and Testing]
- '`kubeadm`: added validation to verify that the `CertificateKey` is a valid hex
  encoded AES key.' ([#120064](https://github.com/kubernetes/kubernetes/pull/120064), [@SataQiu](https://github.com/SataQiu))
- A customizable `OrderedScoreFuncs()` function was introduced. Out-of-tree plugins