eventvariable contains a reference to the event's parent. This means a task may use
event.parent.datato access all the data that informed the construction of the action in question. (Note that only the previous 5 generations of parents are available.)
actionvariable (containing the same information available in
event.data). This variable contains the original action object (including its type, options, and meta information), and data from the run in which the action was performed.
action.options— the original options defined for the action
false, indicating the action's success
action.run.result— the value (if any) generated by the action run
action.run.error— the error (if any) raised during the action run
action.run.okat the very beginning, the task is also able to "break" into failure-handling mode, in which an email is sent to an administrator.