- Add a StorageVersionAPI feature gate that makes API server update storageversions before serving certain write requests. 
  This feature allows the storage migrator to manage storage migration for built-in resources. 

* PodReadinessGate feature is now GA. The feature gate will not allow disabling it. ([#74434](https://github.com/kubernetes/kubernetes/pull/74434), [@freehan](https://github.com/freehan))

- The `VolumeSnapshotDataSource` feature gate that is GA since v1.20 is unconditionally enabled, and can no longer be specified via the `--feature-gates` argument. ([#101531](https://github.com/kubernetes/kubernetes/pull/101531), [@ialidzhikov](https://github.com/ialidzhikov)) [SIG Storage]

### **Storage**

*   [alpha] The LocalPersistentVolumes alpha feature now also requires the VolumeScheduling alpha feature.  This is a breaking change, and the following changes are required:
    *   The VolumeScheduling feature gate must also be enabled on kube-scheduler and kube-controller-manager components.

- The `AdvancedAuditing` feature gate that graduated to GA in `v1.12` (and was unconditionally
  enabled) has been removed. ([#118763](https://github.com/kubernetes/kubernetes/pull/118763), [@Shubham82](https://github.com/Shubham82))

- Removed the `CronJobTimeZone` feature gate (the feature is stable and always enabled)
  - Removed the `JobMutableNodeSchedulingDirectives` feature gate (the feature is stable and always enabled)

### CSI Service Account Token

CSI Service Account Token feature moves to Beta in 1.21. This feature improves the security posture and allows CSI drivers to receive pods' [bound service account tokens](https://github.com/kubernetes/enhancements/blob/master/keps/sig-auth/1205-bound-service-account-tokens/README.md). This feature also provides a knob to re-publish volumes so that short-lived volumes can be refreshed.

- Kubeadm: remove the `IPv6DualStack` feature gate. The feature has been GA and locked to enabled since 1.23. ([#106648](https://github.com/kubernetes/kubernetes/pull/106648), ...

- The `CSIMigrationAzureFile` feature gate (for the feature which graduated to GA in v1.26) is now unconditionally enabled and will be removed in v1.28. ([#114953](https://github.com/kubernetes/kubernetes/pull/114953), [@enj](https://github.com/enj))

([#58574](https://github.com/kubernetes/kubernetes/pull/58574), [@yastij](https://github.com/yastij))

* New alpha feature limits the number of processes running in a pod. Cluster administrators will be able to place limits by using the new kubelet command line parameter --pod-max-pids. Note that since this is a alpha feature they will need to enable the "SupportPodPidsLimit" feature. By default, we do not set any maximum limit, If an administrator wants to enable this, they should enable SupportPodPidsLimit=true...