### Bug or Regression

- Fix a scheduler preemption issue where the victim pod was not deleted due to incorrect status patching. This issue occurred when the preemptor and victim pods had different QoS classes in their status, causing the preemption to fail entirely. ([#126694](https://github.com/kubernetes/kubernetes/pull/126694), [@Huang-Wei](https://github.com/Huang-Wei)) [SIG Scheduling]

* **[Pod priority and preemption](https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/) is now enabled by default.** Note that this means that pods from *any* namespace can now request priority classes that compete with and/or cause preemption of critical system pods that are already running. If that is not desired, disable the PodPriority feature by setting `--feature-...

- Fixed a 1.26 regression scheduling bug by ensuring that preemption is skipped when a PreFilter plugin returns `UnschedulableAndUnresolvable` ([#119952](https://github.com/kubernetes/kubernetes/pull/119952), [@sanposhiho](https://github.com/sanposhiho)) [SIG Scheduling]

Pod Priority and Preemption in Kubernetes ([#564](https://github.com/kubernetes/enhancements/issues/564))

### Bug or Regression

- Fix a scheduler preemption issue where the victim pod was not deleted due to incorrect status patching. This issue occurred when the preemptor and victim pods had different QoS classes in their status, causing the preemption to fail entirely. ([#126693](https://github.com/kubernetes/kubernetes/pull/126693), [@Huang-Wei](https://github.com/Huang-Wei)) [SIG Scheduling]

creation of PriorityClasses ([user doc](https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/))([design doc](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/scheduling/pod-priority-api.md))

* [alpha] This version now supports priority-based preemption of pods ([user doc](https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/))([design doc](https://github.com/kubernetes/community/blob/master/contributors/design-propos...

  // scheduled right away as preemption victims receive their graceful termination periods.
  // This field does not guarantee that the pod will be scheduled on this node. Scheduler may decide
  // to place the pod elsewhere if other nodes become available sooner. Scheduler may also decide to
  // give the resources on this node to a higher priority pod that is created after preemption.

- Migrate  `pkg/kubelet/pluginmanager`  to structured logging ([#99885](https://github.com/kubernetes/kubernetes/pull/99885), [@qingwave](https://github.com/qingwave)) [SIG Node]
- Migrate  `pkg/kubelet/preemption/preemption.go` and `pkg/kubelet/logs/container_log_manager.go` to structured logging ([#99848](https://github.com/kubernetes/kubernetes/pull/99848), [@qingwave](https://github.com/qingwave)) [SIG Node]

* Allow for watching objects larger than 1MB given etcd accepts objects of size up to 1.5MB ([#72053](https://github.com/kubernetes/kubernetes/pull/72053), [@wojtek-t](https://github.com/wojtek-t))
* Improve efficiency of preemption logic in clusters with many pending pods. ([#72895](https://github.com/kubernetes/kubernetes/pull/72895), [@bsalamat](https://github.com/bsalamat))



# v1.12.5

[Documentation](https://docs.k8s.io)

- Migrated `pkg/scheduler/framework/preemption/preemption.go`, `pkg/scheduler/framework/plugins/examples/stateful/stateful.go`, and `pkg/scheduler/framework/plugins/noderesources/resource_allocation.go` to structured logging ([#105967](https://github.com/kubernetes/kubernetes/pull/105967), [@shiv...