code: def add_candidate_peer_endpoints(self, peer_endpoints):
          
          if self._topology:
              self._topology.add_candidate_peer_endpoints(peer_endpoints)
          else:
              LOGGER.debug("Could not add peer endpoints to topology. "
                           "ConnectionManager does not exist.")
docs: Adds candidate endpoints to the list of endpoints to
          attempt to peer with.
  
          Args:
              peer_endpoints ([str]): A list of public uri's which the
                  validator can attempt to peer with.