In general a notifications is defined by these 3 parameters:
  - an event (a condition)
  - a priority (a timeout, although you do not really see a time value)
  - an action (the command to execute)

And because you do not really know when it is executed, it is wise not to 
create a new one - just modify the action, if necessary.

For example, a tape mount request notification
  - starts as a 'Warning'
  - then escalates after a some minutes to an 'Alert'

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