private void updateMetrics() throws MetaException {
    ShowCompactResponse currentCompactions = txnHandler.showCompact(new ShowCompactRequest());
    updateMetricsFromShowCompact(currentCompactions);
    updateDBMetrics();
  }
Collect and publish ACID and compaction related metrics.
Everything should be behind 2 feature flags: {@link MetastoreConf.ConfVars#METRICS_ENABLED} and
{@link MetastoreConf.ConfVars#METASTORE_ACIDMETRICS_THREAD_ON}.
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/metrics/AcidMetricService.java