--- upgrade: - Any Volume Drivers configured in the ``DEFAULT`` config stanza should be moved to their own stanza and enabled via the ``enabled_backends`` config option. The older style of config with ``DEFAULT`` is deprecated and will be removed in future releases. deprecations: - Configuring Volume Drivers in the ``DEFAULT`` config stanza is not going to be maintained and will be removed in the next release. All backends should use the ``enabled_backends`` config option with separate stanza's for each.