A system event is an unplanned event, such as a down node. Incorporating system events into health conditions in the state matrix gives you greater control over the actions Vantage takes when the unexpected happens. To create an event that only sends out a notification, create the event, but do not assign it to a health condition. When the event occurs, TASM performs the notification you specify.
To define a system event, edit the state matrix directly or, in the States view, add to Available Events on the Define and Map Unplanned Events step in the Setup Wizard.