code: def monitor_key_delete(service, key):
      
      try:
          check_output(
              ['ceph', '--id', service,
               'config-key', 'del', str(key)])
      except CalledProcessError as e:
          log("Monitor config-key put failed with message: {}".format(
              e.output))
          raise
docs: Delete a key and value pair from the monitor cluster
      :param service: six.string_types. The Ceph user name to run the command under
      Deletes a key value pair on the monitor cluster.
      :param key: six.string_types.  The key to delete.