docs: private void printServiceInstance(ServiceInstance instance) {
          print("\nServiceInstance\n-------------------------");
          if (instance == null) {
              print("null");
              return;
          }
          print("serviceName:  " + instance.getServiceName());
          print("status:  " + instance.getStatus());
          print("uri:  " + instance.getUri());
          print("address:  " + instance.getAddress());
          print("monitorEnabled:  " + instance.isMonitorEnabled());
          print("metadata:");
          Map<String, String> meta = instance.getMetadata();
          for (Entry<String, String> entry : meta.entrySet()) {
              print("  " + entry.getKey() + "  =>  " + entry.getValue());
          }
      }