code: def failing(self):
          
          log_levels = {key: conn.log_level for key, conn in self.conns.items()
                        if hasattr(conn, 'log_level')}
          for key in log_levels:
              self.conns[key].log_level = logging.CRITICAL
          failing_conns = {key: conn for key, conn in self.active.items()
                           if not conn.check_status}
          for key, level in log_levels.items():
              self.conns[key].log_level = level
          return failing_conns
docs: Tests to see if all connections are working
  
          returns:
              dictionary of all failing connections