pods` preferred inter-pod affinities if the incoming pod has no preferred inter-pod
  affinities. This option can be used as an optimization for higher scheduling throughput
  (at the cost of an occasional pod being scheduled non-optimally/violating existing
  pods preferred inter-pod affinities). To enable this scheduler option, set the

- Fixed a situation when, sometimes, the scheduler incorrectly placed a pod in the `unschedulable` queue instead of the `backoff` queue. This happened when some plugin previously declared the pod as `unschedulable` and then in a later attempt encounters some other error. Scheduling of that pod then got delayed by up to five minutes, after which periodic flushing moved the pod back into the `active` queue. ([#120334](https://github.com/kubernetes/kubernetes/pull/120334), ...

**Affected Versions**:

    - [Certificates](#certificates)
    - [ConfigMap](#configmap)
    - [CronJob](#cronjob)
    - [DaemonSet](#daemonset-1)
    - [Deployment](#deployment-2)
    - [Node](#node)
    - [Pod](#pod)
    - [Pod Security Policy](#pod-security-policy)
    - [RBAC](#rbac-2)
    - [ReplicaSet](#replicaset)
    - [Secrets](#secrets)
    - [Service](#service-1)
    - [StatefulSet](#statefulset-1)

- TerminationGracePeriodSeconds from pod spec is respected for the mirror pod
  Static pods will be deleted gracefully ([#99035](https://github.com/kubernetes/kubernetes/pull/99035), [@ehashman](https://github.com/ehashman)) [SIG Node and Testing]

- Prevents a pod from starving pid resource
- Ability to isolate pid resources pod-to-pod and node-to-pod
kubernetes/kubernetes: [#73651](https://github.com/kubernetes/kubernetes/pull/73651)
kubernetes/enhancements: [#757](https://github.com/kubernetes/enhancements/issues/757) [[kep](https://github.com/kubernetes/enhancements/blob/master/keps/sig-node/757-pid-limiting/README.md)]

- Kubeadm: during "upgrade" , if the "etcd.yaml" static pod does not need upgrade, still consider rotating the etcd certificates and restarting the etcd static pod if the "kube-apiserver.yaml" manifest is to be upgraded and if certificate renewal is not disabled. ...

  When the scheduling queue receives a cluster event, before moving each Pod from unschedulable pod pool to activeQ/backoffQ, it will call QueueingHintFn of plugins that rejected each Pod in the previous scheduling cycle.
  Depending on the value returned from QueueingHintFn, the scheduling queue changes how it queues each Pod:
  - if more than one QueueingHintFn returns QueueImmediately, it queues Pod to activeQ.

- Added HPA support to pod-level resource specifications. When the pod-level resource feature was enabled, HPAs configured with `Resource` type metrics calculated the pod resources from `pod.Spec.Resources` field, if specified. ([#132430](https://github.com/kubernetes/kubernetes/pull/132430), [@laoj2](https://github.com/laoj2)) [SIG Apps, Autoscaling and Testing]...

		* Restored the ability of kubectl running inside a pod to consume resource files specifying a different namespace than the one the pod is running in. ([#44862](https://github.com/kubernetes/kubernetes/pull/44862), [@liggitt](https://github.com/liggitt))