options:
  source:
    default: distro
    type: string
    description: |
      Repository from which to install Ceph

      May be one of the following:

        distro (default)
        ppa:somecustom/ppa (PPA name must include UCA OpenStack Release name)
        deb url sources entry|key id
        or a supported Ubuntu Cloud Archive pocket.

      Supported Ubuntu Cloud Archive pockets include:

        cloud:xenial-pike
        cloud:xenial-queens
        cloud:bionic-rocky

      Note that updating this setting to a source that is known to
      provide a later version of Ceph will trigger a software
      upgrade.