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According to the API docs, Scheduler.getTriggerState(String triggerName, String triggerGroup) can tell you the state of a particular trigger, returning one of these constants: Trigger.STATE_NORMAL, Trigger.STATE_PAUSED, Trigger.STATE_COMPLETE, Trigger.STATE_ERROR, Trigger.STATE_BLOCKED, Trigger.STATE_NONE
But, yeah, that's not entirely intuitive. :)