func (c *minioCollector) Describe(ch chan<- *prometheus.Desc) {
	ch <- c.desc
}

// Collect is called by the Prometheus registry when collecting metrics.
func (c *minioCollector) Collect(ch chan<- prometheus.Metric) {
	// Expose MinIO's version information
	minioVersionInfo.WithLabelValues(Version, CommitID).Set(1.0)

	storageMetricsPrometheus(ch)
	nodeHealthMetricsPrometheus(ch)
	bucketUsageMetricsPrometheus(ch)

	if !isValidRegion(sRegion, region) {
		return ch, ErrAuthorizationHeaderMalformed
	}
	if credElements[2] != string(stype) {
		if stype == serviceSTS {
			return ch, ErrInvalidServiceSTS
		}
		return ch, ErrInvalidServiceS3
	}
	cred.scope.service = credElements[2]
	if credElements[3] != "aws4_request" {
		return ch, ErrInvalidRequestVersion
	}
	cred.scope.request = credElements[3]

}

// Create a clone of the entry.
func (e dataUsageEntry) clone() dataUsageEntry {
	// We operate on a copy from the receiver.
	if e.Children != nil {
		ch := make(dataUsageHashMap, len(e.Children))
		maps.Copy(ch, e.Children)
		e.Children = ch
	}

	if e.AllTierStats != nil {
		e.AllTierStats = e.AllTierStats.clone()
	}
	return e
}

// find a path in the cache.
// Returns nil if not found.

	ch := make(chan prometheus.Metric)
	go func() {
		defer xioutil.SafeClose(ch)
		// Collects prometheus metrics from hist and sends it over ch
		hist.Collect(ch)
	}()

	// Converts metrics received into internal []Metric type
	var metrics []MetricV2
	buckets := make(map[string][]MetricV2, v2MetricsMaxBuckets)
	for promMetric := range ch {
		dtoMetric := &dto.Metric{}

	if err != nil {
		return nil, err
	}
	ch := make(chan MetricV2)
	go func(ch chan<- MetricV2) {
		defer close(ch)
		for _, m := range resp.Value() {
			if m == nil {
				continue
			}
			select {
			case <-ctx.Done():
				return
			case ch <- *m:
			}
		}
	}(ch)
	return ch, nil
}

					if !ok {
						return
					}
					select {
					case ch <- m:
					case <-ctx.Done():
						return
					}
				case <-ctx.Done():
					return
				}
			}
		}(ctx, peerChannels[index], &wg)
	}
	go func(wg *sync.WaitGroup, ch chan MetricV2) {
		wg.Wait()
		xioutil.SafeClose(ch)
	}(&wg, ch)
	return ch
}

			}
		}
		return
	}

	var ch, healCh chan<- ReplicationWorkerOperation
	switch ri.OpType {
	case replication.HealReplicationType, replication.ExistingObjectReplicationType:
		ch = p.mrfReplicaCh
		healCh = p.getWorkerCh(ri.Name, ri.Bucket, ri.Size)
	default:
		ch = p.getWorkerCh(ri.Name, ri.Bucket, ri.Size)
	}
	if ch == nil && healCh == nil {
		return
	}

	select {

		Payload:    req,
		DeadlineMS: uint32(m.deadline.Milliseconds()),
	}
	if m.subroute != nil {
		msg.Flags |= FlagSubroute
	}
	ch := make(chan Response, 1)
	m.respMu.Lock()
	if m.closed {
		m.respMu.Unlock()
		return nil, ErrDisconnected
	}
	m.respWait = ch
	m.respMu.Unlock()
	ctx := m.ctx

	// Add deadline if none.
	if msg.DeadlineMS == 0 {

	if err != nil {
		mask = int(madmin.LogMaskAll)
	}
	ch := make(chan log.Info, 1000)
	err = globalConsoleSys.Subscribe(ch, ctx.Done(), "", 0, madmin.LogMask(mask), nil)
	if err != nil {
		return grid.NewRemoteErr(err)
	}
	var buf bytes.Buffer
	enc := json.NewEncoder(&buf)
	for {
		select {
		case entry, ok := <-ch:
			if !ok {
				return grid.NewRemoteErrString("console log channel closed")

		}
	}
}

// The prime sieve: Daisy-chain filter processes together.
func sieve() {
	ch := make(chan int)  // Create a new channel.
	go generate(ch)       // Start generate() as a subprocess.
	for {
		prime := <-ch
		fmt.Print(prime, "\n")
		ch1 := make(chan int)
		go filter(ch, ch1, prime)
		ch = ch1
	}
}

func main() {
	sieve()
}
</pre>