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Signals

Arguments sent with any of viewflow signals:

sender
The flow class.
process
Process instance
task
Task instance

Flow livecycle signals

signals.flow_started

Happens when flow start task done

signals.flow_finished

Happens right after process had finished

Task livecycle signals

signals.task_started

Happens when long running task starts execution

signals.task_failed

Happens on flow task error

Additional agruments

exception
Exception instance
traceback
Traceback object
signals.task_finished

Happens when any task finished successfully