Icinga says that on elastic1031 the power supply status became CRITical about 8 days ago.
There is also the parent task to replace these servers (linked) that says it can start but if this is related to PSUs that might be separate. And it's just this single host it seems.
(for 8d 2h 57m 23s)
Status Information: Sensor Type(s) Temperature, Power_Supply Status: Critical [PS Redundancy = Critical, Status = Critical, Status = Critical]
Performance Data: 'Inlet Temp'=23.00;3.00:42.00;-7.00:47.00 'Temp'=68.00 'Temp'=61.00