- the `scheduler.alpha.kubernetes.io/critical-pod` annotation is removed. Pod priority (`spec.priorityClassName`) should be used instead to mark pods as critical. ([#80342](https://github.com/kubernetes/kubernetes/pull/80342), [@draveness](https://github.com/draveness))

* Updated priority of mirror pod according to PriorityClassName. ([#58485](https://github.com/kubernetes/kubernetes/pull/58485), [@k82cn](https://github.com/k82cn))

* kube-scheduler: restores default leader election behavior. Setting the `--leader-elect`  command line parameter to `true` ([#60524](https://github.com/kubernetes/kubernetes/pull/60524), [@dims](https://github.com/dims))

  // default.
  // +optional
  optional string priorityClassName = 24;

  // The priority value. Various system components use this field to find the
  // priority of the pod. When Priority Admission Controller is enabled, it
  // prevents users from setting this field. The admission controller populates
  // this field from PriorityClassName.
  // The higher the value, the higher the priority.
  // +optional

- kubeadm: all master components are now exclusively relying on the `PriorityClassName` pod spec for annotating them as cluster critical components. Since `scheduler.alpha.kubernetes.io/critical-pod` annotation is no longer supported by Kubernetes 1.14 this annotation is no longer added to master components. ([#73857](https://...

* Updated priority of mirror pod according to PriorityClassName. ([#58485](https://github.com/kubernetes/kubernetes/pull/58485), [@k82cn](https://github.com/k82cn))

- Kubeadm: explicitly set `priority` for static pods with `priorityClassName: system-node-critical` ([#114338](https://github.com/kubernetes/kubernetes/pull/114338), [@champtar](https://github.com/champtar)) [SIG Cluster Lifecycle]

- kubeadm: remove redundant flags settings for kubelet ([#64682](https://github.com/kubernetes/kubernetes/pull/64682), [@dixudx](https://github.com/dixudx))
- Set “priorityClassName: system-node-critical” on kube-proxy manifest by default. ([#60150](https://github.com/kubernetes/kubernetes/pull/60150), [@MrHohn](https://github.com/MrHohn))

* Fixes a bug where kubelet crashes trying to free memory under memory pressure ([#58574](https://github.com/kubernetes/kubernetes/pull/58574), [@yastij](https://github.com/yastij))
* Updated priority of mirror pod according to PriorityClassName. ([#58485](https://github.com/kubernetes/kubernetes/pull/58485), [@k82cn](https://github.com/k82cn))

- Kubeadm: explicitly set `priority` for static pods with `priorityClassName: system-node-critical` ([#119117](https://github.com/kubernetes/kubernetes/pull/119117), [@champtar](https://github.com/champtar)) [SIG Cluster Lifecycle]

- Kubeadm: explicitly set `priority` for static pods with `priorityClassName: system-node-critical` ([#119118](https://github.com/kubernetes/kubernetes/pull/119118), [@champtar](https://github.com/champtar)) [SIG Cluster Lifecycle]