**Who is affected?**

Only Kubernetes 1.5.0-1.5.4 installations that do all of the following:
* Enable the PodSecurityPolicy API (which is not enabled by default):
  * `--runtime-config=extensions/v1beta1/podsecuritypolicy=true`
* Enable the PodSecurityPolicy admission plugin (which is not enabled by default):
  * `--admission-control=...,PodSecurityPolicy,...`

* Added warning msg for `kubectl get` ([#28352](https://github.com/kubernetes/kubernetes/pull/28352), [@vefimova](https://github.com/vefimova))
* Removed support for HPA in extensions client. ([#30504](https://github.com/kubernetes/kubernetes/pull/30504), [@piosz](https://github.com/piosz))
* Implement DisruptionController. ([#25921](https://github.com/kubernetes/kubernetes/pull/25921), [@mml](https://github.com/mml))

   ([#122329](https://github.com/kubernetes/kubernetes/pull/122329), [@jpbetz](https://github.com/jpbetz))
- Implemented the `prescore` extension point for the `volumeBinding` plugin. It now returns skip if it doesn't do anything in Score.
   ([#115768](https://github.com/kubernetes/kubernetes/pull/115768), [@AxeZhan](https://github.com/AxeZhan))