Use the entity mib instead by typing "snmp-server enable traps entity" which will contain all the metrics for the following:
entity_fan_status_change Entity Fan Status Change
entity_mib_change Entity MIB change
entity_module_inserted Entity Module Inserted
entity_module_removed Entity Module Removed
entity_module_status_change Entity Module Status Change
entity_power_out_change Entity Power Out Change
entity_power_status_change Entity Power Status Change
entity_unrecognised_module Entity Unrecognised Module
Then type to view the enabled traps: "show snmp trap | inc entity".