code: public static void reset() {
          SINGLETON = new HystrixMetricsPublisherFactory();
          SINGLETON.commandPublishers.clear();
          SINGLETON.threadPoolPublishers.clear();
          SINGLETON.collapserPublishers.clear();
      }
docs: Resets the SINGLETON object.
  Clears all state from publishers. If new requests come in instances will be recreated.