If the capacity is zero or absent, the channel is unbuffered and communication
succeeds only when both a sender and receiver are ready. Otherwise, the channel
is buffered and communication succeeds without blocking if the buffer
is not full (sends) or not empty (receives).
A <code>nil</code> channel is never ready for communication.
</p>

<p>
A channel may be closed with the built-in function

### **Cluster Lifecycle**

*   kube-apiserver: `--ssh-user` and `--ssh-keyfile` are now deprecated and will be removed in a future release. Users of SSH tunnel functionality in Google Container Engine for the Master -> Cluster communication should plan alternate methods for bridging master and node networks. ([#54433](https://github.com/kubernetes/kubernetes/pull/54433),[ @dims](https://github.com/dims))

  // sensitive information. If this is not provided, Login operation will fail.
  optional SecretReference secretRef = 3;

  // sslEnabled is the flag to enable/disable SSL communication with Gateway, default false
  // +optional
  optional bool sslEnabled = 4;

  // protectionDomain is the name of the ScaleIO Protection Domain for the configured storage.
  // +optional

- Resolves bottleneck in internal API server communication that can cause increased goroutines and degrade API Server performance ([#80465](https://github.com/kubernetes/kubernetes/pull/80465), [@answer1991](https://github.com/answer1991))

* Update to go 1.12.10 ([#83139](https://github.com/kubernetes/kubernetes/pull/83139), [@cblecker](https://github.com/cblecker))
* Resolves bottleneck in internal API server communication that can cause increased goroutines and degrade API Server performance ([#80465](https://github.com/kubernetes/kubernetes/pull/80465), [@answer1991](https://github.com/answer1991))

* Ensure euqiv hash calculation is per schedule ([#59245](https://github.com/kubernetes/kubernetes/pull/59245), [@resouer](https://github.com/resouer))

* Upped the timeout for apiserver communication in the juju kubernetes-worker charm. ([#59219](https://github.com/kubernetes/kubernetes/pull/59219), [@hyperbolic2346](https://github.com/hyperbolic2346))

* Ignore pods marked for deletion that exceed their grace period in ResourceQuota ([#46542](https://github.com/kubernetes/kubernetes/pull/46542), [@derekwaynecarr](https://github.com/derekwaynecarr))
* kubelet to master communication when doing node status updates now has a timeout to prevent indefinite hangs ([#52176](https://github.com/kubernetes/kubernetes/pull/52176), [@liggitt](https://github.com/liggitt))

* Resolves bottleneck in internal API server communication that can cause increased goroutines and degrade API Server performance ([#80465](https://github.com/kubernetes/kubernetes/pull/80465), [@answer1991](https://github.com/answer1991))

* Resolves bottleneck in internal API server communication that can cause increased goroutines and degrade API Server performance ([#80465](https://github.com/kubernetes/kubernetes/pull/80465), [@answer1991](https://github.com/answer1991))

`docker` service from kubeadm preflight. Docker is no longer special cased during host validation and ideally this task should be done in the now external cri-dockerd project where the importance of the compatibility matters. Use `crictl` for all communication with CRI sockets for actions like pulling images and obtaining a list of running containers instead of using the docker CLI in the case of Docker. ([#107317](https://github.com/kubernetes/kubernetes/pull/107317), [@neolit123](https://github.com/neolit123))...