`volume_manager_total_volumes`
  ([#84907](https://github.com/kubernetes/kubernetes/pull/84907), [@RainbowMango](https://github.com/RainbowMango))
- Deprecated metric `rest_client_request_latency_seconds` has been turned off. ([#83836](https://github.com/kubernetes/kubernetes/pull/83836), [@RainbowMango](https://github.com/RainbowMango))
- Following metrics from kubelet are now marked as with the ALPHA stability level:

- Promoted the feature gate `ValidtaingAdmissionPolicy` to beta, and it is turned off by default. ([#119409](https://github.com/kubernetes/kubernetes/pull/119409), [@alexzielenski](https://github.com/alexzielenski))

- Controller manager serve workqueue metrics ([#87967](https://github.com/kubernetes/kubernetes/pull/87967), [@zhan849](https://github.com/zhan849)) [SIG API Machinery]
- Following metrics have been turned off:
  - kubelet_pod_worker_latency_microseconds
  - kubelet_pod_start_latency_microseconds
  - kubelet_cgroup_manager_latency_microseconds
  - kubelet_pod_worker_start_latency_microseconds

- PodReadinessGate is now turned on by default. ([#67406](https://github.com/kubernetes/kubernetes/pull/67406), [@freehan](https://github.com/freehan)) Courtesy of SIG Node

* Advanced auditing is the default auditing mechanism at `v1beta1`. The new version introduces the following changes:

  * The `--audit-policy-file` option is required if the `AdvancedAuditing` feature is not explicitly turned off (`--feature-gates=AdvancedAuditing=false`) on the API server.
  * The audit log file defaults to JSON encoding when using the advanced auditing feature gate.

- Fix Azure file migration e2e test failure when CSIMigration is turned on. ([#97877](https://github.com/kubernetes/kubernetes/pull/97877), [@andyzhangx](https://github.com/andyzhangx))

  - A custom resource is considered to participate the spec/status convention if and only if the "CustomResourceSubresources" feature gate is turned on and the CRD has `.spec.subresources.status={}`.
- Fixed patch/update operations on multi-version custom resources ([#70087](https://github.com/kubernetes/kubernetes/pull/70087), [@liggitt](https://github.com/liggitt))

* The formerly publicly-available cAdvisor web UI that the kubelet ran on port 4194 by default is now turned off by default. The flag configuring what port to run this UI on `--cadvisor-port` was deprecated in v1.10. Now the default is `--cadvisor-port=0`, in other words, to not run the web server. If you still need to run cAdvisor, the recommended way to...

* Bug fixes:

  * Fix corner-case with OnlyLocal Service healthchecks. ([#44313](https://github.com/kubernetes/kubernetes/pull/44313), [@thockin](https://github.com/thockin))

  joining `etcd` members is now enabled by default. ([#120228](https://github.com/kubernetes/kubernetes/pull/120228), [@pacoxu](https://github.com/pacoxu))