---
upgrade:
  - |
    The ``[oslo_messaging_rabbit] heartbeat_in_pthread`` config option
    defaults to ``False`` again.
    For wsgi applications it is recommended to set this value to ``True``
    but enabling it for non-wsgi services may break such service.
    Please check https://bugs.launchpad.net/oslo.messaging/+bug/1934937
    for more details.