Icinga reported the host down, unresponsive to ping, ssh and nothing in the management console.
The last iLO relative log is:
</>hpiLO-> show /system1/log1/record18 status=0 status_tag=COMMAND COMPLETED Wed Apr 1 21:36:04 2020 /system1/log1/record18 Targets Properties number=18 severity=Caution date=04/01/2020 time=21:27 description=Smart Storage Battery failure (Battery 1, service information: 0x0A). Action: Gather AHS log and contact Support Verbs cd version exit show