@Override
  public void start() {
    long reportingInterval =
        MetastoreConf.getTimeVar(conf, MetastoreConf.ConfVars.METRICS_HADOOP2_INTERVAL, TimeUnit.SECONDS);
    reporter.start(reportingInterval, TimeUnit.SECONDS);
  }
A wrapper around Codahale HadoopMetrics2Reporter to make it a pluggable/configurable Hive Metrics reporter.
standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/common/metrics/metrics2/Metrics2Reporter.java