docs: private static void setBucketCountsAndExemplars(
        List<Bucket> buckets, Distribution.Builder builder) {
      // The first bucket (underflow bucket) should always be 0 count because the Metrics first bucket
      // is [0, first_bound) but StackDriver distribution consists of an underflow bucket (number 0).
      builder.addBucketCounts(0L);
      for (Bucket bucket : buckets) {
        builder.addBucketCounts(bucket.getCount());
        @javax.annotation.Nullable
        io.opencensus.metrics.data.Exemplar exemplar = bucket.getExemplar();
        if (exemplar != null) {
          builder.addExemplars(toProtoExemplar(exemplar));
        }
      }
    }