I've found this thread on SO that the DAG concurrency setting is not obeyed from external triggers (like a backfill). https://stackoverflow.com/questions/45752912/how-control-dag-concurrency-in-airflow
I'm increasing my "parallelism" and "dag_concurrency" as we increase the number of DAGs running, expecting to limit simultaneous tasks per DAG via the `concurrency` attribute. I'd like this enforced always though, not just when triggered by the scheduler. Other than assigning all tasks to pools (which I'll probably do soon) is there another way to enforce the concurrency? Thanks
