An EVENT happens when any counter is changing it status to (yellow) WARNING alert level or to (red) CRITICAL alert level. And this EVENT is 'over' when it the counter becomes 'stable'. The EVENT table gives an overall view of all such EVENTS that have happened on each server.
An ‘alert condition’ (WARNING or CRITICAL) can be closed (and re-opened) for a specific server from both the new EVENTS overview page as well as the 'Monitors' page. This is available from the drop down in the 'List of servers page' helpful in tracking all the Events.
Closing an event is temporarily disabling an EVENT meaning, disabling 'alerting with the yellow/red on the monitors page or sending notifications' until it becomes 'stable' and then goes to the CRITICAL/WARNING (yellow/red) state.
EVENTS can be 'closed' from both the 'Monitors' page (by clicking on the red/yellow alert) and the EVENTS page. 'Opening' of the closed EVENTS can be done from the EVENTS page. Closing ALL EVENTS for a certain server from the 'Monitors' page is possible.
NOTE: Disabling/Enabling of EVENTS would need the user level privilege.