// +optional
  optional string user = 5;

  // keyring is the path to key ring for RBDUser.
  // Default is /etc/ceph/keyring.
  // More info: https://examples.k8s.io/volumes/rbd/README.md#how-to-use-it
  // +optional
  optional string keyring = 6;

  // secretRef is name of the authentication secret for RBDUser. If provided
  // overrides keyring.
  // Default is nil.

- Ceph RBD volume plugin now does not use any keyring (`/etc/ceph/ceph.client.lvs01cinder.keyring`, `/etc/ceph/ceph.keyring`, `/etc/ceph/keyring`, `/etc/ceph/keyring.bin`) for authentication. Ceph user credentials must be provided in PersistentVolume objects and referred Secrets. ([#75588](https://github.com/kubernetes/kubernetes/pull/75588), [@smileusd]...

* Clusters with GCE feature 'DiskAlphaAPI' enabled can now dynamically provision GCE PD volumes. ([#59447](https://github.com/kubernetes/kubernetes/pull/59447), [@verult](https://github.com/verult))

* Added `keyring` parameter for Ceph RBD provisioner. ([#58287](https://github.com/kubernetes/kubernetes/pull/58287), [@madddi](https://github.com/madddi))