code: private List<? extends Tag<?>> getMetadataTags(String applicationName, String applicationId) {
      return Tag.fromMap(
          new ImmutableMap.Builder<String, Object>().put(GobblinClusterMetricTagNames.APPLICATION_NAME, applicationName)
              .put(GobblinClusterMetricTagNames.APPLICATION_ID, applicationId).build());
    }
docs: Get additional {@link Tag}s required for any type of reporting.