* Fix a scalability issue where high rates of event writes degraded etcd performance. ([#64539](https://github.com/kubernetes/kubernetes/pull/64539), [@ccding](https://github.com/ccding))

- Promote StatefulSet minReadySeconds to GA. This means `--feature-gates=StatefulSetMinReadySeconds=true` are not needed on kube-apiserver and kube-controller-manager binaries and they'll be removed soon following policy at https://kubernetes.io/docs/reference/using-api/deprecation-policy/#deprecation ([#110896](https:...

- The `SupportPodPidsLimit` and  `SupportNodePidsLimit` feature gates that are GA since v1.20 are unconditionally enabled, and can no longer be specified via the `--feature-gates` argument. ([#104163](https://github.com/kubernetes/kubernetes/pull/104163), [@ialidzh...

- Features:

  - The following features are now GA, and the associated feature gates are deprecated and will be removed in v1.17:
    - `GCERegionalPersistentDisk` (since 1.15.0)
    - `CustomResourcePublishOpenAPI`
    - `CustomResourceSubresources`
    - `CustomResourceValidation`

- Feat: change parittion style to GPT on Windows ([#101412](https://github.com/kubernetes/kubernetes/pull/101412), [@andyzhangx](https://github.com/andyzhangx)) [SIG Storage and Windows]

### `TokenRequest` / `TokenRequestProjection` graduates to General Availability

Service account tokens bound to a pod is now a stable feature. The feature gates will be removed in 1.21 release. For more information, refer to notes below on the changelogs.

### RuntimeClass feature graduates to General Availability.

- Remove deprecated feature gates `ValidateProxyRedirects` and `StreamingProxyRedirects` ([#106830](https://github.com/kubernetes/kubernetes/pull/106830), [@pacoxu](https://github.com/pacoxu))

- Feat: azure disk migration go beta in 1.19. Feature gates CSIMigration to Beta (on by default) and CSIMigrationAzureDisk to Beta (off by default since it requires installation of the AzureDisk CSI Driver)

* getDeviceNameFromMount() function doesn't return the volume path correctly when the volume path contains spaces [#37712](https://github.com/kubernetes/kubernetes/issues/37712)
* Federation alpha features do not have feature gates defined and
are hence enabled by default. This will be fixed in a future release.
[#38593](https://github.com/kubernetes/kubernetes/issues/38593)
* Federation control plane can be upgraded by updating the image

- Added to `MutableFeatureGate` the ability to override the default setting of feature gates, to allow default-enabling a feature on a component-by-component basis instead of for all affected components simultaneously. ([#122647](https://github.com/kubernetes/kubernetes/pull/122647), [@benluddy](https://github.com/benluddy))