@Override
    boolean attemptAdd(long addBits, long addInterval, int addCount) {
      // addCount >= 2; count >= 2
      if (addInterval == 0 && addBits == getBits()) {
        count += addCount;
        return true;
      }
      return false;
    }
Returns number of items added to values
geode-core/src/main/java/org/apache/geode/internal/statistics/StatArchiveReader.java