Airflow webserver & scheduler don't handle database disconnects. The process appear to error out and either exit or are left in an off state. This was observed when using mysql.
I don't see any database reconnect configuration or code.
Stack tace for scheduler:
File "...../MySQLdb/connections.py", line 204, in _init_
super(Connection, self)._init_(*args, **kwargs2)
sqlalchemy.exc.OperationalError: (_mysql_exceptions.OperationalError) (2002, "Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)")