Every time I need to restart OpenNMS, I get the following (false) alarm for random nodes (about up to 30 alarms): "SNMP data collection on interface IP failed with 'Unexpected error during node SNMP collection for: IP'."
But the data collection is still working for these nodes and I need to manually clear all alarms. This issue is happening since the upgrade to v18.0.0/18.01/18.0.2. I already tried to add "retry" and "timeout" to SNMP datacollection without success.