- The disk-cached discovery client is moved from k8s.io/client-go/discovery to k8s.io/client-go/discovery/cached/disk.
The memory-cached discovery client is moved from k8s.io/client-go/discovery/cached to k8s.io/client-go/discovery/cached/memory.
([#72214](https://github.com/kubernetes/kubernetes/pull/72214), [@caesarxuchao](https://github.com/caesarxuchao))

### Support for cgroups v2 Graduates to Stable

* apiserver: fixes handling and logging of panics in REST handlers to prevent crashes ([#71076](https://github.com/kubernetes/kubernetes/pull/71076), [@liggitt](https://github.com/liggitt))

 - Base-images: Update to kube-cross:v1.13.9-5 ([#90964](https://github.com/kubernetes/kubernetes/pull/90964), [@justaugustus](https://github.com/justaugustus)) [SIG Release and Testing]
 - CSINode initialization does not crash kubelet on startup when APIServer is not reachable or kubelet has not the right credentials yet. ([#89589](https://github.com/kubernetes/kubernetes/pull/89589), [@jsafrane](https://github.com/jsafrane)) [SIG Storage]

* Azure cloudprovider: Fix controller manager crash issue on a manually created k8s cluster. ([#53694](https://github.com/kubernetes/kubernetes/pull/53694), [@andyzhangx](https://github.com/andyzhangx))
* Fix a bug where soft eviction would not trigger when the threshold was crossed ([#52046](https://github.com/kubernetes/kubernetes/pull/52046), [@dashpole](https://github.com/dashpole))

* apiserver: fixes handling and logging of panics in REST handlers to prevent crashes ([#71076](https://github.com/kubernetes/kubernetes/pull/71076), [@liggitt](https://github.com/liggitt))

### Bug or Regression
 - Base-images: Update to kube-cross:v1.13.9-5 ([#90965](https://github.com/kubernetes/kubernetes/pull/90965), [@justaugustus](https://github.com/justaugustus)) [SIG Release]
 - CSINode initialization does not crash kubelet on startup when APIServer is not reachable or kubelet has not the right credentials yet. ([#89589](https://github.com/kubernetes/kubernetes/pull/89589), [@jsafrane](https://github.com/jsafrane)) [SIG Storage]

* Restores the ability of older clients to delete and scale jobs with initContainers ([#59880](https://github.com/kubernetes/kubernetes/pull/59880), [@liggitt](https://github.com/liggitt))
* Fix race causing apiserver crashes during etcd healthchecking ([#60069](https://github.com/kubernetes/kubernetes/pull/60069), [@wojtek-t](https://github.com/wojtek-t))

  // +optional
  optional ContainerState state = 2;

  // LastTerminationState holds the last termination state of the container to
  // help debug container crashes and restarts. This field is not
  // populated if the container is still running and RestartCount is 0.
  // +optional
  optional ContainerState lastState = 3;

- Kube-apiserver: fixes a potential crash serving CustomResourceDefinitions that combine an invalid schema and CEL validation rules. ([#126167](https://github.com/kubernetes/kubernetes/pull/126167), [@cici37](https://github.com/cici37)) [SIG API Machinery and Testing]