* fix vmss dirty cache issue in disk attach/detach on vmss node ([#85158](https://github.com/kubernetes/kubernetes/pull/85158), [@andyzhangx](https://github.com/andyzhangx))
* fix race condition when attach/delete azure disk in same time ([#84917](https://github.com/kubernetes/kubernetes/pull/84917), [@andyzhangx](https://github.com/andyzhangx))

### API Change

- Kube-apiserver: Fixes handling of CRD schemas containing literal null values in enums (#104990, @liggitt) [SIG API Machinery, Apps and Network]

### Bug or Regression

- Detach volumes from vSphere nodes not tracked by attach-detach controller (#104910, @gnufied) [SIG Cloud Provider and Storage]
- Fix: consolidate logs for instance not found error (#105364, @nilo19) [SIG Cloud Provider]

* Flex volume plugin is updated to support attach/detach interfaces. It broke backward compatibility. Please update your drivers and implement the new callouts.  ([#41804](https://github.com/kubernetes/kubernetes/pull/41804), [@chakri-nelluri](https://github.com/chakri-nelluri))

* fix issue: vm sku restriction policy does not work in azure disk attach/detach ([#71941](https://github.com/kubernetes/kubernetes/pull/71941), [@andyzhangx](https://github.com/andyzhangx))

  * Fix AWS EBS volumes not getting detached from node if routine to verify volumes are attached runs while the node is down ([#46463](https://github.com/kubernetes/kubernetes/pull/46463), [@wongma7](https://github.com/wongma7))

		return
	}

	operation := mux.Vars(r)["operation"]
	if operation != "attach" && operation != "detach" {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrAdminInvalidArgument), r.URL)
		return
	}
	isAttach := operation == "attach"

	password := cred.SecretKey
	reqBytes, err := madmin.DecryptData(password, io.LimitReader(r.Body, r.ContentLength))

* Update fluentd-gcp addon to 1.28.1 ([#39706](https://github.com/kubernetes/kubernetes/pull/39706), [@ixdy](https://github.com/ixdy))
* Provide kubernetes-controller-manager flags to control volume attach/detach reconciler sync.  The duration of the syncs can be controlled, and the syncs can be shut off as well.  ([#39551](https://github.com/kubernetes/kubernetes/pull/39551), [@chrislovecnm](https://github.com/chrislovecnm))

// operation, we fetch this info from storage, and refresh the cache as well.
func (store *IAMStoreSys) ListGroups(ctx context.Context) (res []string, err error) {
	cache := store.lock()
	defer store.unlock()

	return store.updateGroups(ctx, cache)
}

// listGroups - lists groups - fetch groups from cache

manually detached before Kubernetes can attach it to other nodes.
  * If a volume is already attached to a node any subsequent attempts to attach it
again (due to kubelet restart, for example) will fail. The volume must either
be manually detached first or the pods referencing it deleted (which would
trigger automatic volume detach).

- Fixed attaching volumes after detach errors. Now volumes that failed to detach are not treated as attached, Kubernetes will make sure they are fully attached before they can be used by pods. ([#120595](https://github.com/kubernetes/kubernetes/pull/120595), [@jsafrane](https://github.com/jsafrane)) [SIG Apps...