@Override
    int getMemoryUsed() {
      int result = super.getMemoryUsed() + 4 + 8 + 8 + 4;
      if (bitIntervals != null) {
        result += bitIntervals.length * 4;
      }
      return result;
    }
Returns number of items added to values
geode-core/src/main/java/org/apache/geode/internal/statistics/StatArchiveReader.java