Type:      counterMetric,
	}
}

func getMinioProcessIOReadBytesMD() MetricDescription {
	return MetricDescription{
		Namespace: nodeMetricNamespace,
		Subsystem: ioSubsystem,
		Name:      readBytes,
		Help:      "Total bytes read by the process from the underlying storage system, /proc/[pid]/io read_bytes",
		Type:      counterMetric,

		if r.Err != nil {
			if debugPrint {
				fmt.Println("Closing mux", m.MuxID, "due to error:", r.Err)
			}
			m.closeLocked()
		}
		return true
	default:
		if m.stateless {
			// Drop message if not stateful.
			return
		}
		err := errors.New("INTERNAL ERROR: Response was blocked")
		gridLogIf(m.ctx, err)
		m.closeLocked()
		return false
	}
}

func (m *muxClient) close() {

| `io_read_bytes`               | `counter` | Total bytes read by the process from the underlying storage system, /proc/[pid]/io read_bytes                  | `server` |
| `io_wchar_bytes`              | `counter` | Total bytes written by the process to the underlying storage system including page cache, /proc/[pid]/io wchar | `server` |

| `minio_node_io_read_bytes`                 | Total bytes read by the process from the underlying storage system, /proc/[pid]/io read_bytes.                  |
| `minio_node_io_wchar_bytes`                | Total bytes written by the process to the underlying storage system including page cache, /proc/[pid]/io wchar. |

	var xlMeta xlMetaV2
	var legacyPreserved bool
	var legacyEntries []string
	if len(dstBuf) > 0 {
		if isXL2V1Format(dstBuf) {
			if err = xlMeta.Load(dstBuf); err != nil {
				// Data appears corrupt. Drop data.
				xlMeta = xlMetaV2{}
			}
		} else {
			// This code-path is to preserve the legacy data.
			xlMetaLegacy := &xlMetaV1Object{}
			json := jsoniter.ConfigCompatibleWithStandardLibrary

		// hence not included in the collector path.
		pathComponents = pathComponents[:bucketIdx]
	}

	innerHandler := h.handle(pathComponents, isListingRequest, buckets)

	// Add tracing to the prom. handler
	tracedHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		tc, ok := r.Context().Value(mcontext.ContextTraceKey).(*mcontext.TraceCtxt)
		if ok {
			tc.FuncName = "handler.MetricsV3"

			if p == k {
				v.Stop()
				delete(globalProfiler, k)
			}
		}
	}

	for _, profiler := range profiles {
		prof, err := startProfiler(profiler)
		if err != nil {
			s.writeErrorResponse(w, err)
			return
		}
		globalProfiler[profiler] = prof
	}
}

// DownloadProfilingDataHandler - returns profiled data.

		meta[xhttp.ContentType] = oi.ContentType
	}

	meta[xhttp.AmzObjectTagging] = oi.UserTags
	meta[xhttp.AmzTagDirective] = "REPLACE"

	if sc == "" {
		sc = oi.StorageClass
	}
	// drop non standard storage classes for tiering from replication
	if sc != "" && (sc == storageclass.RRS || sc == storageclass.STANDARD) {
		meta[xhttp.AmzStorageClass] = sc
	}

	meta[xhttp.MinIOSourceETag] = oi.ETag

	processIOReadBytesMD              = NewCounterMD(processIOReadBytes, "Total bytes read by the process from the underlying storage system, /proc/[pid]/io read_bytes")
	processIOWCharBytesMD             = NewCounterMD(processIOWCharBytes, "Total bytes written by the process to the underlying storage system including page cache, /proc/[pid]/io wchar")

	}

	if m.status == scanStateStarted && update.status != scanStateStarted {
		m.status = update.status
	}

	if m.status == scanStateStarted && time.Since(m.lastHandout) > metacacheMaxClientWait {
		// Drop if client hasn't been seen for 3 minutes.
		m.status = scanStateError
		m.error = "client not seen"
	}

	if m.error == "" && update.error != "" {
		m.error = update.error
		m.status = scanStateError