protected void updateAmsConfigs() throws AmbariException {
    AmbariManagementController ambariManagementController = injector.getInstance(AmbariManagementController.class);
    Clusters clusters = ambariManagementController.getClusters();
    if (clusters != null) {
      Map<String, Cluster> clusterMap = clusters.getClusters();

      if (clusterMap != null && !clusterMap.isEmpty()) {
        for (final Cluster cluster : clusterMap.values()) {
          Map<String, String> newProperties = new HashMap<>();
          LOG.info("Updating ams-site:timeline.metrics.service.default.result.limit to 5760");
          newProperties.put("timeline.metrics.service.default.result.limit", "5760");

          Config config = cluster.getDesiredConfigByType("ams-site");
          if (config != null) {
            Map<String, String> oldAmsSite = config.getProperties();
            if (MapUtils.isNotEmpty(oldAmsSite)) {
              if (oldAmsSite.containsKey("timeline.container-metrics.ttl")) {
                try {
                  int oldTtl = Integer.parseInt(oldAmsSite.get("timeline.container-metrics.ttl"));
                  if (oldTtl > 14 * 86400) {
                    LOG.info("Updating ams-site:timeline.container-metrics.ttl to 1209600");
                    newProperties.put("timeline.container-metrics.ttl", "1209600");
                  }
                } catch (Exception e) {
                  LOG.warn("Error updating Container metrics TTL for ams-site (AMBARI_METRICS)");
                }
              }
              String topnDownsamplerMetricPatternsKey = "timeline.metrics.downsampler.topn.metric.patterns";
              if (oldAmsSite.containsKey(topnDownsamplerMetricPatternsKey) &&
                StringUtils.isNotEmpty(oldAmsSite.get(topnDownsamplerMetricPatternsKey))) {
                LOG.info("Updating ams-site:timeline.metrics.downsampler.topn.metric.patterns to empty.");
                newProperties.put(topnDownsamplerMetricPatternsKey, "");
              }
            }
          }
          LOG.info("Removing ams-site host and aggregate cluster split points.");
          Set<String> removeProperties = Sets.newHashSet("timeline.metrics.host.aggregate.splitpoints",
            "timeline.metrics.cluster.aggregate.splitpoints");
          updateConfigurationPropertiesForCluster(cluster, "ams-site", newProperties, removeProperties, true, true);


          Map<String, String> newAmsHbaseSiteProperties = new HashMap<>();
          Config amsHBasiteSiteConfig = cluster.getDesiredConfigByType("ams-hbase-site");
          if (amsHBasiteSiteConfig != null) {
            Map<String, String> oldAmsHBaseSite = amsHBasiteSiteConfig.getProperties();
            if (MapUtils.isNotEmpty(oldAmsHBaseSite)) {
              if (oldAmsHBaseSite.containsKey("hbase.snapshot.enabled")) {
                try {
                  Boolean hbaseSnapshotEnabled = Boolean.valueOf(oldAmsHBaseSite.get("hbase.snapshot.enabled"));
                  if (!hbaseSnapshotEnabled) {
                    LOG.info("Updating ams-hbase-site:hbase.snapshot.enabled to true");
                    newAmsHbaseSiteProperties.put("hbase.snapshot.enabled", "true");
                  }
                } catch (Exception e) {
                  LOG.warn("Error updating ams-hbase-site:hbase.snapshot.enabled (AMBARI_METRICS)");
                }
              }
            }
            updateConfigurationPropertiesForCluster(cluster, "ams-hbase-site", newAmsHbaseSiteProperties, true, true);
          }

        }
      }
    }
  }
@return a map describing the new LDAP configuration key to the old ambari.properties property name
ambari-server/src/main/java/org/apache/ambari/server/upgrade/UpgradeCatalog270.java