- kubectl: `--use-openapi-print-columns` has been deprecated in favor of `--server-print`, and will be removed in a future version. ([#65601](https://github.com/kubernetes/kubernetes/pull/65601), [@liggitt](https://github.com/liggitt))...

Pruning is activated by setting `spec.preserveUnknownFields: false` in the CustomResourceDefinition. A future apiextensions.k8s.io/v1 variant of CRDs will enforce pruning.

Pruning requires that CRD developer provides complete, structural validation schemas, either at the top-level or for all versions of the CRD.

- Kubeadm: the `--feature-gates` flag is deprecated and no-op for `kubeadm upgrade apply/plan`, and it will be removed in a future release. The upgrade workflow is not designed to reconfigure the cluster. Please edit the 'featureGates' field of ClusterConfiguration...

kubectl create -f tprs.yaml

#### kubectl

Kubectl flag `--container-port` flag is deprecated: it will be removed in the future, please use `--target-port` instead.

#### kubernetes Core Known Issues

- Kube Proxy crashes infrequently due to a docker bug ([#24000](https://github.com/docker/docker/issues/24000))

// the DaemonSet and StatefulSet controllers for update and rollback, this object is beta. However,
// it may be subject to name and representation changes in future releases, and clients should not
// depend on its stability. It is primarily for internal use by controllers.
message ControllerRevision {
  // Standard object's metadata.

func f() {
	print(a)
}

func hello() {
	a = "hello, world"
	go f()
}
</pre>

<p>
calling <code>hello</code> will print <code>"hello, world"</code>
at some point in the future (perhaps after <code>hello</code> has returned).
</p>

<h3 id="goexit">Goroutine destruction</h3>

<p>
The exit of a goroutine is not guaranteed to be synchronized before
any event in the program.

### Kubernetes API Reference Documentation

type httpStreamResponse struct {
	done  chan error
	block chan []byte
	err   error
}

// Write part of the streaming response.
// Note that upstream errors are currently not forwarded, but may be in the future.
func (h *httpStreamResponse) Write(b []byte) (int, error) {
	if len(b) == 0 || h.err != nil {
		// Ignore 0 length blocks
		return 0, h.err
	}
	tmp := make([]byte, len(b))
	copy(tmp, b)
	h.block <- tmp

 - `kubeadm`: a separate "super-admin.conf" file is now deployed....

* Add get/delete cluster, delete context to kubectl config ([#29821]...