Fortigate Cluster Node Alerts

If HA Mode is ActivePassive at least 2 devices must be present to have a working cluster.
Is it possible do implement an option to alert if the device count is changed?

Actually it seems it's only possible to check and alert for the config sync status (fgHAStatsSyncStatus).
If the standby device goes down or the device count changes observium get's that info but alerting is not possible for that.
It's still shown OK as fgHAStatsSyncStatus is still OK for the one remaining cluster node.

Thanks,
Alex