---
fixes:
  - >
    [`bug 1622310 <https://bugs.launchpad.net/keystone/+bug/1622310>`_]
    Keystone trust will be invalidated if the project to which the trust
    is scoped, or the user (trustor or trustee) for which the delegation
    is assigned, have been deleted.
other:
  - Abstract method ``delete_trusts_for_project`` should be implemented by
    custom drivers.