code: private void checkUndefinedNotification(Notification notification) {
          String type = notification.getType();
          PathAddress source = notification.getSource();
          Map<String, NotificationEntry> descriptions = getRootResourceRegistration().getNotificationDescriptions(source, true);
          if (!descriptions.keySet().contains(type)) {
              missingNotificationDescriptionWarnings.add(ControllerLogger.ROOT_LOGGER.notificationIsNotDescribed(type, source));
          }
      }
docs: Check that each emitted notification is properly described by its source.