A common idiom here is to use a PythonBranchOperator to check if a condition has been met and short circuit the DAG's execution if it hasn't. We started using this ShortCircuitOperator instead because it's much simpler to implement and (critically) to understand: if the condition returns False, DAG execution stops.

This makes it simple to gently introduce non-Task dependencies (file not available, table not updated, don't run on weekends, don't run on holidays, don't run if some metric isn't at a critical level).