case 3:
					httpStats.currentS3Requests.Inc("ListObjects")
				}
			}
		}(i)
	}

	for i := range numReaders {
		wg.Add(1)
		go func(readerID int) {
			defer wg.Done()
			for range opsPerGoroutine {
				_ = httpStats.toServerHTTPStats(false)
				_ = httpStats.totalS3Requests.Load(false)
				_ = httpStats.currentS3Requests.Load(false)
				time.Sleep(1 * time.Microsecond)
			}

		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))