void dataNodeOnBecomingFullAuto() {
    List<String> tags = instanceNameToInstanceConfig.get(selfInstanceName).getTags();
    DataNodeId dataNodeId = instanceNameToAmbryDataNode.get(selfInstanceName);
    List<String> resources = tags.stream()
        .map(tag -> dcToTagToResourceProperty.get(dataNodeId.getDatacenterName()).get(tag).name)
        .collect(Collectors.toList());
    helixClusterManagerMetrics.registerMetricsForFullAuto(resources, this);
  }
Callback method when this data node is becoming FULL AUTO mode.
ambry-clustermap/src/main/java/com/github/ambry/clustermap/HelixClusterManager.java