- Kubeadm: `kubeadm upgrade apply` now supports phase sub-command, user can use `kubeadm upgrade apply phase <phase-name>` to execute the specified phase, or use `kubeadm upgrade apply --skip-phases <phase-names>` to skip some phases during cluster upgrade. ([#126032](https://github.com/kubernetes/kubernetes/pull/126032), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]

// listSem is a semaphore restricting concurrent invocations of 'go list'. 'go
// list' has its own internal concurrency, so we use a hard-coded constant (to
// allow the I/O-intensive phases of 'go list' to overlap) instead of scaling
// all the way up to GOMAXPROCS.
var listSem = make(chan semToken, 2)

type semToken struct{}

- Kubeadm: add the `--dry-run` flag to the `control-plane` phase of "kubeadm init". ([#102722](https://github.com/kubernetes/kubernetes/pull/102722), [@vinayakankugoy...

                    List<?> unrecognized = mavenConfig.getArgList();
                    if (!unrecognized.isEmpty()) {
                        // This file can only contain options, not args (goals or phases)
                        throw new ParseException("Unrecognized maven.config file entries: " + unrecognized);
                    }
                }
            }
        } catch (ParseException e) {

 */
package org.apache.maven.plugin.lifecycle;

/**
 * A phase mapping definition.
 *
 * @version $Revision$ $Date$
 */
@SuppressWarnings("all")
public class Phase implements java.io.Serializable {

    // --------------------------/
    // - Class/Member Variables -/
    // --------------------------/

    /**
     * The ID of this phase, e.g., <code>generate-sources</code>.
     */
    private String id;

Kubeadm: Expose the `kubeadm join` workflow as phases

- The `kubeadm join` command can now be used in phases. Similar to the work that was done for `kubeadm init` in 1.13, in 1.14 the `join` phases can be now executed step-by-step/selectively using the `kubeadm join phase` sub-command. This makes it possible to further customize the workflow of joining nodes to the cluster.

  - **apiserver_flowcontrol_priority_level_seat_count_watermarks**: histograms of high and low watermarks of number of seats occupied by executing requests (both regular and final-delay phases included), broken down by priority_level.

endpoint for the kubelet when creating a cluster with "kubeadm init" or when joining control plane nodes with "kubeadm join".  The "kubeadm join" workflow now includes two new experimental phases called "control-plane-join-etcd" and "kubelet-wait-bootstrap" which will be used when the feature gate is enabled. This phases will be marked as non-experimental when ControlPlaneKubeletLocalMode becomes GA. During "kubeadm upgrade" commands, if the feature gate is enabled, modify the "/etc/kubernetes/kubelet.conf...

- kubeadm now includes the ability to specify certificate encryption and decryption keys for the upload and download certificate phases as part of the new v1beta2 kubeadm config format. ([#77012](https://github.com/kubernetes/kubernetes/pull/77012), [@rosti](https://github.com/rosti))

   ([#123341](https://githu...