@Override
  public long getIntermediateIndexHitCount() {
    return this.cacheStats != null ? this.cacheStats.getIntermediateIndexHitCount() : 0L;
  }
This is the runnable that will be executed on the executor every PERIOD number of seconds It
will take metrics/numbers from all of the regions and use them to compute point in time
metrics.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MetricsRegionServerWrapperImpl.java