Nagios Support Forum

You would need to define multiple traps for this and use the MATCH statement to differentiate them.

Edit your current trap definition and at the bottom add this to the Additional Raw Data input:
Then go to Admin > SNMP Trap Interface > Add a Trap Definition and add the exact same info but use this MATCH statement instead and select OK for the Check Status:
http://www.snmptt.org/docs/snmptt.shtml ... CONF-MATCH

See if those work for you, the first one will match only if "Alarm cleared" doesn't exist in that SNMP enterprise variable, the second one only matches if it does contain it.