code: def add_circuit_breaker(self, circ_breaker):
          
          if circ_breaker not in self._circuit_breakers and isinstance(circ_breaker, CircuitBreakerDing0):
              self._circuit_breakers.append(circ_breaker)
              self.graph_add_node(circ_breaker)
docs: Creates circuit breaker object and ...
  
          Args
          ----
          circ_breaker: CircuitBreakerDing0
              Description #TODO