- The in-tree AWS EBS plugin `kubernetes.io/aws-ebs` is now deprecated and will be removed in 1.21. Users that self-deploy Kubernetes on AWS should enable CSIMigration + CSIMigrationAWS features and install the AWS EBS CSI Driver (https://github.com/kubernetes-sigs/aws-ebs-csi-driver) to avoid disruption to existing Pod and PVC objects at that time. Users should start using the AWS EBS CSI CSI Driver directly for any new volumes. ([#85237](https://g...

  * Dynamic Provisioning of PersistentVolumes: Kubernetes previously required all
volumes to be manually provisioned by a cluster administrator before use. With
this feature, volume plugins that support it (GCE PD, AWS EBS, and Cinder) can
automatically provision a PersistentVolume to bind to an unfulfilled
PersistentVolumeClaim.
  * Run multiple schedulers in parallel, e.g. one or more custom schedulers

### AWS

- [aws-alb-ingress-controller v1.0.0](https://github.com/kubernetes-sigs/aws-alb-ingress-controller/releases/tag/v1.0.0)
- [aws-ebs-csi-driver v0.1](https://github.com/kubernetes-sigs/aws-ebs-csi-driver/releases/tag/v0.1.0)
- [cloudprovider-aws external v0.1.0](https://github.com/kubernetes/cloud-provider-aws/blob/master/changelogs/CHANGELOG-0.1.md)

### SIG Azure

New alpha features include:
* Online volume resizing will increase the filesystem size of a resized volume without requiring a Pod restart.
* AWS EBS and GCE PD volumes support increased limits on the maximum number of attached volumes per node.
* Subpath volume directories can be created using DownwardAPI environment variables.

### SIG Windows

 - CSI migration of AWS EBS volumes requires AWS EBS CSI driver ver. 1.0 that supports `allowAutoIOPSPerGBIncrease` parameter in StorageClass. ([#101082](https://github.com/kubernetes/kubernetes/pull/101082), [@jsafrane](https://github.com/jsafrane))

- Fix panic when processing Azure HTTP response. ([#68210](https://github.com/kubernetes/kubernetes/pull/68210), [@feiskyer](https://github.com/feiskyer))
- Fix volume limit for EBS on m5 and c5 instance types ([#66397](https://github.com/kubernetes/kubernetes/pull/66397), [@gnufied](https://github.com/gnufied))

- Fix CSI-migrated inline EBS volumes failing to mount if their volumeID is prefixed by aws:// ([#96821](https://github.com/kubernetes/kubernetes/pull/96821), [@wongma7](https://github.com/wongma7)) [SIG Storage]

If CSI Migration is working properly, Kubernetes end users shouldn’t notice a difference.
After migration, Kubernetes users may continue to rely on all the functionality of in-tree storage plugins using the existing interface.
- CSI Migration feature is turned on by default but stays in Beta for GCE PD, AWS EBS, and Azure Disk in 1.23.

### AWS

- Kubernetes will now use the zone from the node for topology aware aws-ebs volume creation to reduce unnecessary cloud provider calls. ([#78276](https://github.com/kubernetes/kubernetes/pull/78276), [@zhan849](https://github.com/zhan849))