- You can now have different operation names for different storage operations. This still prevents two operations on same volume from happening concurrently but if the operation changes, it resets the exponential backoff.
([#75213](https://github.com/kubernetes/kubernetes/pull/75213), [@gnufied](https://github.com/gnufied))

    * If your config files contains fields with wrong case, the config files will be now invalid.
* GCE: Fixes operation polling to adhere to the specified interval. Furthermore, operation errors are now returned instead of ignored. ([#64630](https://github.com/kubernetes/kubernetes/pull/64630), [@nicksardo](https://github.com/nicksardo))

* GCE: Fixed operation polling to adhere to the specified interval. Furthermore, operation errors are now returned instead of ignored. ([#64630](https://github.com/kubernetes/kubernetes/pull/64630), [@nicksardo](https://github.com/nicksardo))

* Updates Cinder AttachDisk operation to be more reliable by delegating Detaches to volume manager. ([#50042](https://github.com/kubernetes/kubernetes/pull/50042), [@jingxu97](https://github.com/jingxu97))

protobuf you will be forced to restore from backup, and you will lose any changes
since you converted to protobuf.  After conversion to protobuf, you should
validate the correct operation of your cluster thoroughly before returning it
to normal operation.

Backups are always a good precaution, particularly around upgrades, but this
upgrade has multiple known issues where the only remedy is to restore from
backup.

    * try to only update vm if detach a non-existing disk when got <200, error> after detach disk operation
* fix pod stuck issue due to corrupt mnt point in flexvol plugin, call Unmount if PathExists returns any error ([#75234](https://github.com/kubernetes/kubernetes/pull/75234), [@andyzhangx](https://github.com/andyzhangx))

* The getSubnetIDForLB() should return subnet id rather than net id. ([#58208](https://github.com/kubernetes/kubernetes/pull/58208), [@FengyunPan](https://github.com/FengyunPan))
* Add cache for VM get operation in azure cloud provider ([#57432](https://github.com/kubernetes/kubernetes/pull/57432), [@karataliu](https://github.com/karataliu))

### Other (Cleanup or Flake)

- Reduce event spam during a volume operation error. ([#89794](https://github.com/kubernetes/kubernetes/pull/89794), [@msau42](https://github.com/msau42)) [SIG Storage]


# v1.17.4

[Documentation](https://docs.k8s.io)

## Downloads for v1.17.4

- Added the `SizeBasedListCostEstimate` feature gate (enabled by default), which changes how APF seats are assigned to `LIST` requests. With this feature, one seat is assigned per 100KB of data loaded into memory at once during a `LIST` operation. ([#132932](https://github.com/kubernetes/kubernetes/pull/132932), [@serathius](https://github.com/serathius))

    * try to only update vm if detach a non-existing disk when got <200, error> after detach disk operation
* This adds some useful metrics around pending changes and last successful ([#78602](https://github.com/kubernetes/kubernetes/pull/78602), [@paulgmiller](https://github.com/paulgmiller))
    * sync time.