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ps1 eqiad Icinga UNKNOWNs
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A bunch of icinga unknowns with the following pattern have appeared starting last Tuesday (2019-07-23):

ps1-a3-eqiad ps1-a3-eqiad-infeed-load-tower-A-phase-X External command error: Error in packet

Likely related to pdu refresh: T227139.

Event Timeline

icinga1001:~$ /usr/lib/nagios/plugins/check_snmp -H -o . -C <secret>
External command error: Error in packet
Reason: (noSuchName) There is no such variable name in this MIB.
Failed object: iso.

I think this is because the old PDUs use the Sentry3 MIB, while the new ones use Sentry4, similar to T229101.
After a quick look I can't find any 1:1 match in the new MIB.