title: Apache Airflow scheduler is not running after some time
body: <p>I am running a complex flow in apache airflow and using local executor with postgres db. It is running for tasks and scheduler goes down after some time. In airlfow console cant see any logs</p>
  <p>using airflow - puckel/docker-airflow:1.10.9 deployed in openshift environment</p>
  <p>Error in airflow UI:
  <em><strong>The scheduler does not appear to be running. Last heartbeat was received 3 hours ago.
  The DAGs list may not update, and new tasks will not be scheduled.</strong></em></p>