---
upgrade:
  - >
    [`bug 1641660 <https://bugs.launchpad.net/keystone/+bug/1641660>`_]
    The default value for ``[DEFAULT] notification_format`` has been changed
    from ``basic`` to ``cadf``. The CADF notifications have more information
    about the user that initiated the request.
  - >
    [`bug 1641660 <https://bugs.launchpad.net/keystone/+bug/1641660>`_]
    The default value for ``[DEFAULT] notification_opt_out`` has been changed
    to include: ``identity.authenticate.success``, ``identity.authenticate.pending``
    and ``identity.authenticate.failed``. If a deployment relies on these
    notifications, then override the default setting.