"Distribution of time to first byte across API calls for a bucket",
		"bucket", "name", "le", "type")
)

// loadBucketAPIHTTPMetrics - loads bucket level S3 HTTP metrics.
//
// This is a `MetricsLoaderFn`.
//
// This includes bucket level S3 HTTP metrics and S3 network in/out metrics.
func loadBucketAPIHTTPMetrics(ctx context.Context, m MetricValues, _ *metricsCache, buckets []string) error {
	if len(buckets) == 0 {
		return nil

			bucketAPIRequestsTotalMD,
			bucketAPIRequestsCanceledMD,
			bucketAPIRequests4xxErrorsMD,
			bucketAPIRequests5xxErrorsMD,

			bucketAPIRequestsTTFBSecondsDistributionMD,
		},
		JoinBucketLoaders(loadBucketAPIHTTPMetrics, loadBucketAPITTFBMetrics),
	)

	bucketReplicationMG := NewBucketMetricsGroup(bucketReplicationCollectorPath,
		[]MetricDescriptor{
			bucketReplLastHrFailedBytesMD,
			bucketReplLastHrFailedCountMD,