This notification variable carries a free-text description of an event generated by a Junos op-script or event-policy, giving the admin a human-readable summary of what triggered the notification. An admin reads this text to understand at a glance what custom scripted condition fired, since op-script and event-policy traps are user-defined rather than fixed vendor events. For example, a trap might carry jnxEventTrapDescr text like 'Interface ge-0/0/1 flapped 5 times in 60 seconds' describing a custom-scripted condition that was detected.