---
upgrade:
  - |
    RBD driver: the ``rbd_keyring_conf`` configuration option, which
    was deprecated in the Ussuri release, has been removed.  If it is
    present in a configuration file, its value will silently be
    ignored.  For more information, see `OSSN-0085
    <https://wiki.openstack.org/wiki/OSSN/OSSN-0085>`_:
    Cinder configuration option can leak secret key from Ceph backend.