code: private List<Routee> makeRoutes() {
      return Registry.policies(settings).stream().map(policy -> {
        ActorRef actorRef = context().actorOf(Props.create(PolicyActor.class, policy));
        context().watch(actorRef);
        return new ActorRefRoutee(actorRef);
      }).collect(toList());
    }
docs: Returns the actors to broadcast trace events to.