- For all kinds in the API group version, a spec.selector default value is no longer
 available, because it's incompatible with `kubectl
 apply` and strategic merge patch. You must explicitly set the spec.selector value
 in your manifest. An object with a spec.selector value that does not match the labels in
 its spec.template is invalid.

 - Selector mutation is disabled for all kinds in the

- Kubernetes components that perform leader election now only support using `Leases` for this. ([#114055](https://github.com/kubernetes/kubernetes/pull/114055), [@aimuz](https://github.com/aimuz))

  graceful shutdown (even if it's the only/last one). ([#116685](https://github.com/kubernetes/kubernetes/pull/116685), [@nayihz](https://github.com/nayihz))
- `kubeadm:` fixed a bug where the static pod changes detection logic is inconsistent
  with kubelet. ([#118069](https://github.com/kubernetes/kubernetes/pull/118069), [@SataQiu](https://github.com/SataQiu))

- Client-go: Optimized leaders renewing leases by updating leader lock optimistically without getting the record from the API server first. Also, a new metric `leader_election_slowpath_total` was added to allow users to monitor how many leader elections are updated non-optimistically.
   ([#122069](https://github.com/kubernetes/kubernetes/pull/122069), [@linxiulei](https://github.com/linxiulei))

- `kubeadm`: Fixed the bug where it always did CRI detection when `--config` was passed, even if it is not required by the subcommand. ([#120828](https://github.com/kubernetes/kubernetes/pull/120828), [@SataQiu](https://github.com/SataQiu))

- Kubeadm: fix a bug where the static pod changes detection logic is inconsistent with kubelet ([#118069](https://github.com/kubernetes/kubernetes/pull/118069), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]

## Dependencies

### Added