- `daemonsets`, `deployments`, `replicasets` resources under `extensions/v1beta1` - use `apps/v1` instead
    - `networkpolicies` resources under `extensions/v1beta1` - use `networking.k8s.io/v1` instead
    - `podsecuritypolicies` resources under `extensions/v1beta1` - use `policy/v1beta1` instead

    Serving these resources can be temporarily re-enabled using the `--runtime-config` apiserver flag.

    - `apps/v1beta1=true`

#### Security
* Features:

  * Permission to use a PodSecurityPolicy can now be granted within a single namespace by allowing the use verb on the podsecuritypolicies resource within the namespace. ([#42360](https://github.com/kubernetes/kubernetes/pull/42360), [@liggitt](https://github.com/liggitt))

  - `daemonsets`, `deployments`, `replicasets` resources under `extensions/v1beta1` - use `apps/v1` instead
  - `networkpolicies` resources under `extensions/v1beta1` - use `networking.k8s.io/v1` instead

### Other notable changes

* Cluster Autoscaler 1.0.3 ([#55947](https://github.com/kubernetes/kubernetes/pull/55947), [@aleksandra-malinowska](https://github.com/aleksandra-malinowska))
* - Add PodSecurityPolicies for cluster addons ([#55509](https://github.com/kubernetes/kubernetes/pull/55509), [@tallclair](https://github.com/tallclair))
    * - Remove SSL cert HostPath volumes from heapster addons

*   A new controller automatically cleans up Certificate Signing Requests that are Approved and Issued, or Denied. ([#51840](https://github.com/kubernetes/kubernetes/pull/51840),[ @jcbsmpsn](https://github.com/jcbsmpsn))
*   PodSecurityPolicies have been added for all in-tree cluster addons ([#55509](https://github.com/kubernetes/kubernetes/pull/55509),[ @tallclair](https://github.com/tallclair))

#### **GCE**

## Changelog since v1.20.0

## What's New (Major Themes)

### Deprecation of PodSecurityPolicy