The affected host, elastic1043, is due to be replaced soon per https://phabricator.wikimedia.org/T279158. Rather than file a proper hardware failure with dc-ops, I'm just using this ticket as a placeholder so I have something to ack the alerts with.
I can't find much useful from the system event logs (https://wikitech.wikimedia.org/wiki/SRE/Dc-operations/Platform-specific_documentation/HP_Documentation#Show_system_event_log_entries). Here's the latest entry (not recent):
/system1/log1/record30
Targets
Properties
number=30
severity=Repaired
date=09/15/2020
time=15:56
description=System Power Supplies Not Redundant
Verbs
cd version exit showBut note that the instance is in a power off state and doesn't seem to want to turn back on:
</>hpiLO-> power status=0 status_tag=COMMAND COMPLETED Tue Dec 14 17:54:28 2021 power: server power is currently: Off </>hpiLO-> power on status=0 status_tag=COMMAND COMPLETED Tue Dec 14 17:54:32 2021 Server powering on ....... </>hpiLO-> power status=0 status_tag=COMMAND COMPLETED Tue Dec 14 17:57:27 2021 power: server power is currently: Off