if !ok {
		hstats = bucketHTTPAPIStats{
			currentS3Requests: &HTTPAPIStats{},
			totalS3Requests:   &HTTPAPIStats{},
			totalS3Canceled:   &HTTPAPIStats{},
			totalS34xxErrors:  &HTTPAPIStats{},
			totalS35xxErrors:  &HTTPAPIStats{},
		}
	}

	if w == nil { // when response recorder nil, this is an active request
		hstats.currentS3Requests.Inc(api)
		bh.httpStats[bucket] = hstats
		return
	} // else {

	m.Set(apiRequestsWaitingTotal, float64(httpStats.S3RequestsInQueue), "type", "s3")
	m.Set(apiRequestsIncomingTotal, float64(httpStats.S3RequestsIncoming), "type", "s3")

	for name, value := range httpStats.CurrentS3Requests.APIStats {
		m.Set(apiRequestsInFlightTotal, float64(value), "name", name, "type", "s3")
	}
	for name, value := range httpStats.TotalS3Requests.APIStats {

		if countBktStat {
			globalBucketHTTPStats.updateHTTPStats(bucket, api, nil)
		}

		globalHTTPStats.currentS3Requests.Inc(api)
		f.ServeHTTP(w, r)
		globalHTTPStats.currentS3Requests.Dec(api)

		tc, _ := r.Context().Value(mcontext.ContextTraceKey).(*mcontext.TraceCtxt)
		if tc != nil {
			globalHTTPStats.updateStats(api, tc.ResponseRecorder)

// and sends to given channel
func httpMetricsPrometheus(ch chan<- prometheus.Metric) {
	httpStats := globalHTTPStats.toServerHTTPStats(true)

	for api, value := range httpStats.CurrentS3Requests.APIStats {
		ch <- prometheus.MustNewConstMetric(
			prometheus.NewDesc(
				prometheus.BuildFQName(s3Namespace, "requests", "current"),
				"Total number of running s3 requests in current MinIO server instance",

type ServerHTTPStats struct {
	S3RequestsInQueue      int32              `json:"s3RequestsInQueue"`
	S3RequestsIncoming     uint64             `json:"s3RequestsIncoming"`
	CurrentS3Requests      ServerHTTPAPIStats `json:"currentS3Requests"`
	TotalS3Requests        ServerHTTPAPIStats `json:"totalS3Requests"`
	TotalS3Errors          ServerHTTPAPIStats `json:"totalS3Errors"`

	mg.RegisterRead(func(ctx context.Context) (metrics []MetricV2) {
		if !mg.metricsGroupOpts.bucketOnly {
			httpStats := globalHTTPStats.toServerHTTPStats(true)
			metrics = make([]MetricV2, 0, 3+
				len(httpStats.CurrentS3Requests.APIStats)+
				len(httpStats.TotalS3Requests.APIStats)+
				len(httpStats.TotalS3Errors.APIStats)+
				len(httpStats.TotalS35xxErrors.APIStats)+
				len(httpStats.TotalS34xxErrors.APIStats))