Airflow UI comes very handy to check the status of Airflow DAG progress.
Airflow Rest API is another way to check the status to Airflow DAGs but it requires authentication token.
We can get authentication token from Airflow UI, but if Airflow UI is down it would be difficult to get authentication token and Airflow DAG status.
Is there any other way to check/monitor and clear task instance from backend (apart from Rest API and Airflow UI) ?