var errXML APIErrorResponse
					err = xml.Unmarshal(errBytes, &errXML)
					if err != nil {
						t.Fatalf("%s, Failed to unmarshal error response from upload part request \"%s\"/\"%s\": <ERROR> %v.",
							reqType, bucketName, test.objectName, err)
					}
					// Validate whether the error has occurred for the expected reason.
					if want.Code != errXML.Code {

          "exemplar": true,
          "expr": "sum by (bucket,api) (increase(minio_bucket_requests_4xx_errors_total{job=\"$scrape_jobs\"}[$__rate_interval]))",
          "interval": "1m",
          "intervalFactor": 2,
          "legendFormat": "{{bucket,api}}",
          "refId": "A"
        }
      ],
      "title": "S3 API Request 4xx Error Rate",
      "type": "timeseries"
    },
    {
      "datasource": {

type concErr struct {
	errMap     map[string]error
	summaryErr error
}

func (c concErr) Error() string {
	if c.summaryErr != nil {
		return c.summaryErr.Error()
	}
	return "<nil>"
}

func (c concErr) Unwrap() error {
	return c.summaryErr
}

func (c *SiteReplicationSys) toErrorFromErrMap(errMap map[string]error, actionName string) error {
	if len(errMap) == 0 {
		return nil

func (p *ReplicationPool) loadMRF() (mrfRec MRFReplicateEntries, err error) {
	loadMRF := func(rc io.ReadCloser) (re MRFReplicateEntries, err error) {
		defer rc.Close()

		if !p.initialized() {
			return re, nil
		}
		var data [4]byte
		n, err := rc.Read(data[:])
		if err != nil {
			return re, err
		}
		if n != len(data) {
			return re, errors.New("replication mrf: no data")
		}

	if err != nil {
		err = msgp.WrapError(err, "Metrics")
		return
	}
	z.Error, err = dc.ReadString()
	if err != nil {
		err = msgp.WrapError(err, "Error")
		return
	}
	return
}

// EncodeMsg implements msgp.Encodable
func (z *DiskInfo) EncodeMsg(en *msgp.Writer) (err error) {
	// array header, size 18
	err = en.Append(0xdc, 0x0, 0x12)
	if err != nil {
		return
	}

func (z *dataUsageHash) DecodeMsg(dc *msgp.Reader) (err error) {
	{
		var zb0001 string
		zb0001, err = dc.ReadString()
		if err != nil {
			err = msgp.WrapError(err)
			return
		}
		(*z) = dataUsageHash(zb0001)
	}
	return
}

// EncodeMsg implements msgp.Encodable
func (z dataUsageHash) EncodeMsg(en *msgp.Writer) (err error) {
	err = en.WriteString(string(z))
	if err != nil {

		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrBadRequest), r.URL)
		return
	}

	opts, err := getOpts(ctx, r, bucket, object)
	if err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	// Check for auth type to return S3 compatible error.
	// type to return the correct error (NoSuchKey vs AccessDenied)

	response, err := s.client.Do(request)
	c.Assert(err, nil)
	c.Assert(response.StatusCode, http.StatusOK)

	// constructing HTTP request to fetch a non-existent object.
	// expected to fail, error response asserted for expected error values later.
	objectName := "testObject"
	request, err = newTestSignedRequest(http.MethodGet, getGetObjectURL(s.endPoint, bucketName, objectName),
		0, nil, s.accessKey, s.secretKey, s.signer)

		Subsystem: driveSubsystem,
		Name:      "errors_timeout",
		Help:      "Total number of drive timeout errors since server start",
		Type:      counterMetric,
	}
}

func getNodeDriveIOErrorsMD() MetricDescription {
	return MetricDescription{
		Namespace: nodeMetricNamespace,
		Subsystem: driveSubsystem,
		Name:      "errors_ioerror",
		Help:      "Total number of drive I/O errors since server start",