Comment 32 for bug 1878548

Verified wallaby-proposed with the following output:

$ apt-cache policy masakari-monitors-common
masakari-monitors-common:
  Installed: 11.0.0-0ubuntu1~cloud1
  Candidate: 11.0.0-0ubuntu1~cloud1
  Version table:
 *** 11.0.0-0ubuntu1~cloud1 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu focal-proposed/wallaby/main amd64 Packages
        100 /var/lib/dpkg/status
     9.0.0-0ubuntu0.20.04.1 500
        500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
     9.0.0~b3~git2020041013.e225e6d-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

Tested fencing communication between a compute host and all masakari/corosync units e.g.

# do this on all masakari units
iptables -I INPUT -p tcp -s 10.0.0.32 --sport 3121 -j REJECT

# then wait for compute host 10.0.0.32 to get rebooted
ubuntu@maas:~/stsstack-bundles/openstack$ openstack notification list
+--------------------------------------+----------------------------+---------+--------------+--------------------------------------+----------------------------------------------------------------------------+
| notification_uuid | generated_time | status | type | source_host_uuid | payload |
+--------------------------------------+----------------------------+---------+--------------+--------------------------------------+----------------------------------------------------------------------------+
| 573d9cc8-6b73-4b62-b83a-094ae0921a88 | 2023-11-29T12:31:51.000000 | running | COMPUTE_HOST | b9ec33a9-839a-4f8e-a1ab-5c4cdd61274d | {'event': 'STOPPED', 'cluster_status': 'OFFLINE', 'host_status': 'NORMAL'} |
+--------------------------------------+----------------------------+---------+--------------+--------------------------------------+----------------------------------------------------------------------------+

Only the single node was rebooted and no others.