docs: public void combineHistogram(FixedBucketsHistogram otherHistogram)
    {
      if (otherHistogram == null) {
        return;
      }
  
      readWriteLock.writeLock().lock();
      otherHistogram.getReadWriteLock().readLock().lock();
  
      try {
        missingValueCount += otherHistogram.getMissingValueCount();
  
        if (bucketSize == otherHistogram.getBucketSize() &&
            lowerLimit == otherHistogram.getLowerLimit() &&
            upperLimit == otherHistogram.getUpperLimit()) {
          combineHistogramSameBuckets(otherHistogram);
        } else {
          combineHistogramDifferentBuckets(otherHistogram);
        }
      }
      finally {
        readWriteLock.writeLock().unlock();
        otherHistogram.getReadWriteLock().readLock().unlock();
      }
    }