---
security:
  - |
    Prevents additional updates of an agent ``callback_url`` through the agent
    heartbeat ``/v1/heartbeat/<node_uuid>`` endpoint as the ``callback_url``
    should remain stable through the cleaning, provisioning, or rescue
    processes. Should anything such as an unexpected agent reboot cause the
    ``callback_url``, heartbeat operations will now be ignored.
    More information can be found at
    `story 2006773 <https://storyboard.openstack.org/#!/story/2006773>`_.