- Reduce critical section in watchcache to fix kube-apiserver scalability under heavy load of list requests ([#122027](https://github.com/kubernetes/kubernetes/pull/122027), [@wojtek-t](https://github.com/wojtek-t)) [SIG API Machinery]

- Reduce memory usage/allocations during wait for volume attachment ([#126575](https://github.com/kubernetes/kubernetes/pull/126575), [@Lucaber](https://github.com/Lucaber)) [SIG Node and Storage]

* allow windows mount path ([#51240](https://github.com/kubernetes/kubernetes/pull/51240), [@andyzhangx](https://github.com/andyzhangx))
* Reduce log noise produced by prometheus-to-sd, by bumping it to version 0.2.2. ([#54635](https://github.com/kubernetes/kubernetes/pull/54635), [@loburm](https://github.com/loburm))

- Reduce critical section in watchcache to fix kube-apiserver scalability under heavy load of list requests ([#122027](https://github.com/kubernetes/kubernetes/pull/122027), [@wojtek-t](https://github.com/wojtek-t)) [SIG API Machinery]

- Services implemented a field selector for the ClusterIP and Type fields.
  The Kubelet uses this field selector to avoid monitoring Headless Services, which helps reduce memory consumption. ([#123905](https://github.com/kubernetes/kubernetes/pull/123905), [@aojea](https://github.com/aojea)) [SIG Apps, Node and Testing]

   ([#121958](https://github.com/kubernetes/kubernetes/pull/121958), [@neolit123](https://github.com/neolit123))
- Added an optimization to reduce stack memory usage for watch requests. It can be disabled with the feature gate: `APIServingWithRoutine=false` ([#120902](https://github.com/kubernetes/kubernetes/pull/120902), [@linxiulei](https://github.com/linxiulei))

- Reduce 5s delay of tainting `node.kubernetes.io/unreachable:NoExecute` when a Node becomes unreachable ([#120816](https://github.com/kubernetes/kubernetes/pull/120816), [@tnqn](https://github.com/tnqn)) [SIG Apps and Node]

- Print pod.Spec.RuntimeClassName in kubectl describe ([#110914](https://github.com/kubernetes/kubernetes/pull/110914), [@yeahdongcn](https://github.com/yeahdongcn)) [SIG CLI]

- Reduce API server memory when many CRDs are loaded by sharing a single etcd3 client logger across all clients ([#111648](https://github.com/kubernetes/kubernetes/pull/111648), [@negz](https://github.com/negz)) [SIG API Machinery]