* 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))

of an interface type or of elements of a composite type remains unchanged:
</p>

<pre>
// A Mutex is a data type with two methods, Lock and Unlock.
type Mutex struct         { /* Mutex fields */ }
func (m *Mutex) Lock()    { /* Lock implementation */ }
func (m *Mutex) Unlock()  { /* Unlock implementation */ }

// NewMutex has the same composition as Mutex but its method set is empty.

   ([#121983](https://github.com/kubernetes/kubernetes/pull/121983), [@andyzhangx](https://github.com/andyzhangx))
- Client-go: Optimized leaders renewing leases by updating leader lock optimistically without getting the record from the API server first. Also, a new metric `leader_election_slowpath_total` was added to allow users to monitor how many leader elections are updated non-optimistically.

### Bug or Regression

- Fix pull image error from multiple ACRs using azure managed identity ([#96355](https://github.com/kubernetes/kubernetes/pull/96355), [@andyzhangx](https://github.com/andyzhangx)) [SIG Cloud Provider]
- Fix race condition on timeCache locks. ([#94751](https://github.com/kubernetes/kubernetes/pull/94751), [@auxten](https://github.com/auxten))

## 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))

 - Scheduler's CycleState now embeds internal read/write locking inside its `Read()` and `Write()` functions. Meanwhile, `Lock()` and `Unlock()` function are removed. Scheduler plugin developers are now required to remove `CycleState#Lock()` and `CycleState#Unlock()`. Just simply use `Read()` and `Write()` as they're natively thread-safe now. ([#101542](https://github.com/kubernetes/kubernetes/pull/101542), [@Huang-Wei](https:...

- Kubeadm: graduate the kubeadm specific feature gate ControlPlaneKubeletLocalMode to GA and lock it to enabled by default. To opt-out manually from this desired default behavior you must patch the "server" field in the  /etc/kubernetes/kubelet.conf file. The subphase of "kubeadm join phase control-plane-join" called "etcd" is now deprecated, hidden...

- Removed "endpoint-controller" and "workload-leader-election" FlowSchemas from the default APF configuration.
  

* Fixed scanning of failed iSCSI targets. ([#74306](https://github.com/kubernetes/kubernetes/pull/74306), [@jsafrane](https://github.com/jsafrane))
* fix detach azure disk back off issue which has too big lock in failure retry condition ([#76573](https://github.com/kubernetes/kubernetes/pull/76573), [@andyzhangx](https://github.com/andyzhangx))