- Delegated authorization can now allow unrestricted access for `system:masters` like the main kube-apiserver ([#70671](https://github.com/kubernetes/kubernetes/pull/70671), [@deads2k](https://github.com/deads2k))

* azure: fix Azure Container Registry integration ([#40142](https://github.com/kubernetes/kubernetes/pull/40142), [@colemickens](https://github.com/colemickens))
* azure disk: restrict name length for Azure specifications ([#40030](https://github.com/kubernetes/kubernetes/pull/40030), [@colemickens](https://github.com/colemickens))

- Kube-apiserver: The NodeRestriction admission plugin now restricts Node labels kubelets are permitted to set when creating a new Node to the `--node-labels` parameters accepted by kubelets in 1.16+. ([#90307](https://github.com/kubernetes/kubernetes/pull/90307), [@liggitt](https://github.com/liggitt)) [SIG Auth...

  * Mark all static pods on the Master node as critical to prevent preemption ([#47356](https://github.com/kubernetes/kubernetes/pull/47356), [@dashpole](https://github.com/dashpole))

  * Restrict active deadline seconds max allowed value to be maximum uint32 to avoid overflow ([#46640](https://github.com/kubernetes/kubernetes/pull/46640), [@derekwaynecarr](https://github.com/derekwaynecarr))

* Try self-repair scheduler cache or panic ([#37379](https://github.com/kubernetes/kubernetes/pull/37379), [@wojtek-t](https://github.com/wojtek-t))

### Volume Plugins

#### Azure Disk
* restrict name length for Azure specifications ([#40030](https://github.com/kubernetes/kubernetes/pull/40030), [@colemickens](https://github.com/colemickens))

#### GlusterFS

- CEL: added name formats library. ([#123572](https://github.com/kubernetes/kubernetes/pull/123572), [@alexzielenski](https://github.com/alexzielenski)) [SIG API Machinery]
- Changed Linux swap handling to restrict access to swap for containers in high priority Pods.
  New Pods that have a node- or cluster-critical priority are prohibited from accessing swap on Linux,

- Adds the `ReadWriteOncePod` access mode for `PersistentVolumes` and `PersistentVolumeClaims`. Restricts volume access to a single pod on a single node. ([#102028](https://github.com/kubernetes/kubernetes/pull/102028), [@chrishenzie](https://github.com/chrishenzie))

* [Federation][kubefed]: Use StorageClassName for etcd pvc ([#46323](https://github.com/kubernetes/kubernetes/pull/46323), [@marun](https://github.com/marun))
* Restrict active deadline seconds max allowed value to be maximum uint32 ([#46640](https://github.com/kubernetes/kubernetes/pull/46640), [@derekwaynecarr](https://github.com/derekwaynecarr))

* Added StorageClass API to restrict topologies of dynamically provisioned volumes. ([#63233](https://github.com/kubernetes/kubernetes/pull/63233), [@lichuqiang](https://github.com/lichuqiang))

* Updates defaultbackend to 1.5 ([#69380](https://github.com/kubernetes/kubernetes/pull/69380), [@bowei](https://github.com/bowei))
* Restrict redirect following from the apiserver to same-host redirects, and ignore redirects in some cases. ([#66516](https://github.com/kubernetes/kubernetes/pull/66516), [@tallclair](https://github.com/tallclair))