void incGlobalMemStoreSize(MemStoreSize mss) {
    incGlobalMemStoreSize(mss.getDataSize(), mss.getHeapSize(), mss.getOffHeapSize());
  }
Returns the retained metrics of region's read and write requests count
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionServerAccounting.java