- Improve speed of vSphere PV provisioning and reduce number of API calls ([#102350](https://github.com/kubernetes/kubernetes/pull/102350), [@gnufied](https://github.com/gnufied)) [SIG Cloud Provider and Storage]

- Reduce event spam during volume operation errors in Portworx in-tree driver ([#135193](https://github.com/kubernetes/kubernetes/pull/135193), [@gohilankit](https://github.com/gohilankit)) [SIG Storage]

### Other (Cleanup or Flake)

- Reduce API server memory when many CRDs are loaded by sharing a single etcd3 client logger across all clients ([#111649](https://github.com/kubernetes/kubernetes/pull/111649), [@negz](https://github.com/negz)) [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]

- Improve speed of vSphere PV provisioning and reduce number of API calls ([#102351](https://github.com/kubernetes/kubernetes/pull/102351), [@gnufied](https://github.com/gnufied)) [SIG Cloud Provider and Storage]

  static final class Segment<K, V> extends ReentrantLock {

    /*
     * TODO(fry): Consider copying variables (like evictsBySize) from outer class into this class.
     * It will require more memory but will reduce indirection.
     */

    /*
     * Segments maintain a table of entry lists that are ALWAYS kept in a consistent state, so can

* 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]

   ([#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 event spam during volume operation errors in Portworx in-tree driver ([#135191](https://github.com/kubernetes/kubernetes/pull/135191), [@gohilankit](https://github.com/gohilankit)) [SIG Storage]