func loadBucketAPIHTTPMetrics(ctx context.Context, m MetricValues, _ *metricsCache, buckets []string) error {
	if len(buckets) == 0 {
		return nil
	}
	for bucket, inOut := range globalBucketConnStats.getBucketS3InOutBytes(buckets) {
		recvBytes := inOut.In
		if recvBytes > 0 {
			m.Set(apiTrafficSentBytes, float64(recvBytes), "bucket", bucket, "type", "s3")
		}
		sentBytes := inOut.Out
		if sentBytes > 0 {

		bucketStats[k] = inOutBytes{
			In:  v.s3InputBytes,
			Out: v.s3OutputBytes,
		}
	}
	return bucketStats
}

// Return S3 total input/output bytes for each
func (s *bucketConnStats) getBucketS3InOutBytes(buckets []string) map[string]inOutBytes {
	s.RLock()
	defer s.RUnlock()

	if len(s.stats) == 0 || len(buckets) == 0 {
		return nil
	}

	bucketStats := make(map[string]inOutBytes, len(buckets))