- Implemented opportunistic batching (KEP-5598) to optimize scheduling for pods with identical scheduling requirements. ([#135231](https://github.com/kubernetes/kubernetes/pull/135231), [@bwsalmon](https://github.com/bwsalmon)) [SIG Node, Scheduling, Storage and Testing]

- Implemented a new status field, `.status.terminatingReplicas`, for Deployments and ReplicaSets to track terminating pods. The new field is present when the `DeploymentPodReplacementPolicy` feature gate is enabled. ([#128546](https://github.com/kubernetes/kubernetes/pull/128546), [@atiratree](https://github.com/atiratree)) [SIG API Machinery, Apps and Testing]

- Implemented `event_handling_duration_seconds` metric, which is the time the scheduler takes to handle each kind of events. ([#125929](https://github.com/kubernetes/kubernetes/pull/125929), [@sanposhiho](https://github.com/sanposhiho))

* Transition service account controller clients to TokenRequest API ([#72179](https://github.com/kubernetes/kubernetes/pull/72179), [@WanLinghao](https://github.com/WanLinghao))
* kubeadm: reimplemented IPVS Proxy check that produced confusing warning message. ([#75036](https://github.com/kubernetes/kubernetes/pull/75036), [@bart0sh](https://github.com/bart0sh))

   ([#122329](https://github.com/kubernetes/kubernetes/pull/122329), [@jpbetz](https://github.com/jpbetz))
- Implemented the `prescore` extension point for the `volumeBinding` plugin. It now returns skip if it doesn't do anything in Score.
   ([#115768](https://github.com/kubernetes/kubernetes/pull/115768), [@AxeZhan](https://github.com/AxeZhan))

* Implemented `kubeadm upgrade plan` for checking whether you can upgrade your cluster to a newer version ([#48899](https://github.com/kubernetes/kubernetes/pull/48899), [@luxas](https://github.com/luxas))
    * Implemented `kubeadm upgrade apply` for upgrading your cluster from one version to an other

* Created a new `dryRun` query parameter for mutating endpoints. If the parameter is set, then the query will be rejected, as the feature is not implemented yet. This will allow forward compatibility with future clients; otherwise, future clients talking with older apiservers might end up modifying a resource even if they include the `dryRun` query parameter. ([#63557](https://github.com/kubernetes...

- Implemented a queueing hint for PersistentVolumeClaim/Add event in the `CSILimit` plugin. ([#124703](https://github.com/kubernetes/kubernetes/pull/124703), [@utam0k](https://github.com/utam0k)) [SIG Scheduling and Storage]

- The infrastructure for contextual logging is complete (feature gate implemented, JSON backend ready). ([#108995](https://github.com/kubernetes/kubernetes/pull/108995), [@pohly](https://github.com/pohly))

* Implemented `kubeadm upgrade plan` for checking whether you can upgrade your cluster to a newer version ([#48899](https://github.com/kubernetes/kubernetes/pull/48899), [@luxas](https://github.com/luxas))
    * Implemented `kubeadm upgrade apply` for upgrading your cluster from one version to an other