---
upgrade:
  - |
    Prometheus Alertmanager has been switched to active/passive mode. This is
    enabled by default but can be turned off by setting
    ``prometheus_alertmanager_active_passive`` to ``no``.
fixes:
  - |
    Fixes an issue with Alertmanager silence creation leading to a 404 page.
    `LP#1987866 <https://launchpad.net/bugs/1987866>`__