private static Set<ClusterRequest> createConfigRequestsForNewServices(AddServiceInfo request) {
    Map<String, Map<String, String>> fullProperties = request.getConfig().getFullProperties();
    Map<String, Map<String, Map<String, String>>> fullAttributes = request.getConfig().getFullAttributes();

    return createConfigRequestsForServices(
      request.newServices().keySet(),
      configType -> !Objects.equals(configType, ConfigHelper.CLUSTER_ENV),
      request, fullProperties, fullAttributes
    );
  }
@return {@code Optional} with the cluster's kerberos descriptor artifact if it exists, otherwise empty {@code Optional}
ambari-server/src/main/java/org/apache/ambari/server/topology/addservice/ResourceProviderAdapter.java