Force a node to be complete if the trigger evaluates, without running any of the nodes.
This allows you to have tasks in the suite which a run only if others fail. In practice the node would need to have a trigger also.
This allows you to have standby nodes which may run depending on the success of other nodes.
Here is an example where task tt does not run if task t meter is more than 120. If task t however completes, but the meter step is less that 120 the standby job will run.
family f
task t
meter step 0 240 120
task tt
complete t:step ge 120
trigger t==complete
endfamily