Event action priorities

The Classic Event subsystem contains three different queues for event actions:

• Critical queue
  A critical queue contains any actions for event tags that have been assigned a critical priority. Actions for events that are given a critical priority will be processed first. It is extremely important that the critical queue is used with caution. Only singularly important actions with short processing times should be assigned as critical. You should never assign snapshot or summary actions as critical. There is no overload protection for processing critical actions; if the system becomes overloaded, actions may not execute in a timely fashion or may not execute at all.

• Normal queue
  This type of queue contains any actions for event tags that have been assigned a normal priority. All non-critical events are labeled with a "normal" priority and will be processed after the critical events.

• Delayed queue
  This type of queue contains any actions for event tags that have been assigned a post-detector delay. The post detector delay is the minimum amount of time that must elapse after an event was detected before the associated action can be executed.