Sometimes, a trap comes in from a managed device that results in a message starting with;
"Unknown alert from device...."
The reason for this is that the Trap OIDs are not certified in Spectrum and require a customised mapping to be done for Spectrum to understand them.
Consequently, no alarm is generated and the trap simply remains as an event. To fix this situation, what you can do is create a customised event, which raises an alarm for these traps.