We had also some issues with SNMP, in our case v3 seems to work not proberly.
Downgrading on v2c did the job for the moment - see https://forum.checkmk.com/t/upgrade-to-v2-1-printer-dont-show-any-snmp-informetion/31936/13
We had also some issues with SNMP, in our case v3 seems to work not proberly.
Downgrading on v2c did the job for the moment - see https://forum.checkmk.com/t/upgrade-to-v2-1-printer-dont-show-any-snmp-informetion/31936/13