* iSCSI Persistent Volume Sources can now reference CHAP Secrets in namespaces other than the namespace of the bound Persistent Volume Claim ([#51530](https://github.com/kubernetes/kubernetes/pull/51530), [@rootfs](https://github.com/rootfs))

  
  vSphere releases less than 67u3 are deprecated as of v1.21. Please consider upgrading vSphere to 67u3 or above. vSphere CSI Driver requires minimum vSphere 67u3.
  

* PersistentVolume flexVolume sources can now reference secrets in a namespace other than the PersistentVolumeClaim's namespace. ([#56460](https://github.com/kubernetes/kubernetes/pull/56460), [@liggitt](https://github.com/liggitt))

### Windows

* You can now resize PersistentVolumes without taking them offline ([ref](https://github.com/kubernetes/enhancements/issues/531))
* You can now set a maximum volume count ([ref](https://github.com/kubernetes/enhancements/issues/554))
* You can now do environment variable expansion in a subpath mount. ([ref](https://github.com/kubernetes/enhancements/issues/559))

* Add a feature to the scheduler to score fewer than all nodes in every scheduling cycle. This can improve performance of the scheduler in large clusters. ([#66733](https://github.com/kubernetes/kubernetes/pull/66733), [@bsalamat](https://github.com/bsalamat))

* People can see the right log and note. ([#84637](https://github.com/kubernetes/kubernetes/pull/84637), [@zhipengzuo](https://github.com/zhipengzuo))

  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.
  - If no QueueingHintFn returns QueueImmediately and more than one plugin returns QueueAfterBackoff, it queues Pod to backoffQ if Pod is backing off, or to activeQ if Pod's backoff has already finished.

  - Kube-scheduler can run more than one scheduling profile. Given a pod, the profile is selected by using its `.spec.schedulerName`. ([#88285](https://github.com/kubernetes/kubernetes/pull/88285), [@alculquicondor](https://github.com/alculquicondor)) [SIG Apps, Scheduling and Testing]

- The Kubelet now properly requests protobuf objects where they are supported from the apiserver, reducing load in large clusters. ([#75602](https://github.com/kubernetes/kubernetes/pull/75602), [@smarterclayton](https://github.com/smarterclayton))

### OpenStack

- Add "reason" field to image_garbage_collected_total metric, so admins can differentiate images that were collected for reason "age" vs "space" ([#123345](https://github.com/kubernetes/kubernetes/pull/123345), [@haircommander](https://github.com/haircommander)) [SIG Node]