- Kubelets configured to rotate client certificates now publish a `certificate_manager_server_ttl_seconds` gauge metric indicating the remaining seconds until certificate expiration. ([#91148](https://github.com/kubernetes/kubernetes/pull/91148), [@liggitt](https://github.com/liggitt))...

    - `rest_client_certificate_rotation_age` a histogram reporting the age of a just rotated client certificate in seconds. ([#84382](https://github.com/kubernetes/kubernetes/pull/84382), [@sambdavidson](https://github.com/sambdavidson)) [SIG API Machinery, Auth, Cluster Lifecycle and Instrumentation]

### Misc

- Service account controller clients to now use the TokenRequest API, and tokens are periodically rotated. ([#72179](https://github.com/kubernetes/kubernetes/pull/72179), [@WanLinghao](https://github.com/WanLinghao))

* kubelet `--cert-dir` now defaults to `/var/lib/kubelet/pki`, in order to ensure bootstrapped and rotated certificates persist beyond a reboot. resolves an issue in kubeadm with false-positive `/var/lib/kubelet is not empty` message during pre-flight checks ([#53317](https://github.com/kubernetes/kubernetes/pull/53317), [@liggitt](https://github.com/liggitt))...

* client-go: shortens refresh period for token files to 1 minute to ensure auto-rotated projected service account tokens are read frequently enough. ([#72437](https://github.com/kubernetes/kubernetes/pull/72437), [@liggitt](https://github.com/liggitt))

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- Kube-log-runner: Added the `-log-file-size` parameter to rotate log output into a new file once it reached a certain size. Introduced `-log-file-age` to enable automatic removal of old output files, and `-flush-interval` to support periodic flushing. ([#127667](https://github.com/kubernetes/kubernetes/pull/127667),...

- The Kubernetes API server now correctly detects and closes existing TLS connections when its client certificate file for kubelet authentication has been rotated. ([#115567](https://github.com/kubernetes/kubernetes/pull/115567), [@enj](https://github.com/enj)) [SIG API Machinery, Node and Testing]

## Dependencies

### Added
_Nothing has changed._

### Changed

- The Kubernetes API server now correctly detects and closes existing TLS connections when its client certificate file for kubelet authentication has been rotated. ([#115566](https://github.com/kubernetes/kubernetes/pull/115566), [@enj](https://github.com/enj)) [SIG API Machinery, Node and Testing]

## Dependencies

### Added
_Nothing has changed._

### Changed

- The Kubernetes API server now correctly detects and closes existing TLS connections when its client certificate file for kubelet authentication has been rotated. ([#115580](https://github.com/kubernetes/kubernetes/pull/115580), [@enj](https://github.com/enj)) [SIG API Machinery, Node and Testing]

## Dependencies

### Added
_Nothing has changed._

### Changed