The "Event Monitor" tab for a network device shows you all of the event monitors that have been assigned to check the selected device. The description or each event monitor is displayed along with the number of unviewed events it has and its last status.

It's a great way to see which event monitors are watching a particular device. For each device you can see the last status as a result of the event monitor run and the number of unviewed events. Click on an event monitor in the list to navigate to it and view its settings. You can also use the green dropdown arrow pause or resume the event monitor.