* kubectl help now provides "Did you mean this?" suggestions for typo/invalid command names. ([#27049](https://github.com/kubernetes/kubernetes/pull/27049), [@andreykurilin](https://github.com/andreykurilin))
* Lock all possible kubecfg files at the beginning of ModifyConfig. ([#28232](https://github.com/kubernetes/kubernetes/pull/28232), [@cjcullen](https://github.com/cjcullen))

* Make addon-manager cross-platform and use it with hyperkube ([#25631](https://github.com/kubernetes/kubernetes/pull/25631), [@luxas](https://github.com/luxas))
* kubelet: Optionally, have kubelet exit if lock file contention is observed, using --exit-on-lock-contention flag ([#25596](https://github.com/kubernetes/kubernetes/pull/25596), [@derekparker](https://github.com/derekparker))

- Promoted `PodReplacementPolicy` to `beta`. ([#121491](https://github.com/kubernetes/kubernetes/pull/121491), [@dejanzele](https://github.com/dejanzele))
- Promoted `ServiceNodePortStaticSubrange` to stable and lock to default. ([#120233](https://github.com/kubernetes/kubernetes/pull/120233), [@xuzhenglun](https://github.com/xuzhenglun))

* Features:

  * Add Host field to TCPSocketAction ([#42902](https://github.com/kubernetes/kubernetes/pull/42902), [@louyihua](https://github.com/louyihua))

	* Add the ability to lock on ConfigMaps to support HA for self hosted components ([#42666](https://github.com/kubernetes/kubernetes/pull/42666), [@timothysc](https://github.com/timothysc))

## Changelog since v1.14.9

### Other notable changes

* azure: update disk lock logic per vm during attach/detach to allow concurrent updates for different nodes. ([#85115](https://github.com/kubernetes/kubernetes/pull/85115), [@aramase](https://github.com/aramase))

### Feature

- Kubeadm: generate CA certificates with a start time that is offset 5 minutes in the past relative to the current system time to workaround cases of clock desync.
  client-go: allow to set NotBefore in NewSelfSignedCACert() ([#119114](https://github.com/kubernetes/kubernetes/pull/119114), [@champtar](https://github.com/champtar)) [SIG API Machinery, Auth and Cluster Lifecycle]