Ever since our HUM was upgraded from 1.1 to 1.2..there is this strange behaviour where the Interface Utilisation template on an existing poller (which worked without a hitch in 1.1) would produce no data for 1-2 days, then working again for approx. the same number of days and then off again.
Restarting upm process doesn't seem to have any effect. upm_process.log and upmprocess.log shows nothing particularly interesting except this:
ERROR,[SNMPThrPool1057],com.cisco.nm.upm.pollingengine.UPMGenericResponseHandler,performComputations,680,EvaluationException occured for the device: <RouterIP> for poller:RouterPolling"
This only occurs for the Interface Utilisation template...all others (cpu utilisation, etc) works fine (continuous data across any period) so it's safe to rule out any polling/connectivity issue.
Would post the full log if required but has anyone come across this before?
Thanks in advance.