)

const (
	// a heal sequence with this many un-consumed heal result
	// items blocks until heal-status consumption resumes or is
	// aborted due to timeout.
	maxUnconsumedHealResultItems = 1000

	// if no heal-results are consumed (via the heal-status API)
	// for this timeout duration, the heal sequence is aborted.
	healUnconsumedTimeout = 24 * time.Hour

	// time-duration to keep heal sequence state after it
	// completes.

	if lookupHost == nil {
		lookupHost = net.DefaultResolver.LookupHost
	}

	if baseDialCtx == nil {
		// This is same as which `http.DefaultTransport` uses.
		baseDialCtx = (&net.Dialer{
			Timeout:   30 * time.Second,
			KeepAlive: 30 * time.Second,
		}).DialContext
	}

	return func(ctx context.Context, network, addr string) (conn net.Conn, err error) {
		host, port, err := net.SplitHostPort(addr)

	configLock.RLock()
	r.Header.Set(xhttp.SubnetAPIKey, c.APIKey)
	configLock.RUnlock()
	r.Header.Set(xhttp.MinioDeploymentID, xhttp.GlobalDeploymentID)

	client := &http.Client{
		Timeout:   10 * time.Second,
		Transport: c.transport,
	}

	resp, err := client.Do(r)
	if err != nil {
		return "", err
	}
	defer xhttp.DrainBody(resp.Body)

// Call (TestGrid).Cleanup() when done.
func SetupTestGrid(n int) (*TestGrid, error) {
	hosts, listeners, err := getHosts(n)
	if err != nil {
		return nil, err
	}
	dialer := &net.Dialer{
		Timeout: 5 * time.Second,
	}
	var res TestGrid
	res.Hosts = hosts
	ready := make(chan struct{})
	ctx, cancel := context.WithCancel(context.Background())
	res.cancel = cancel
	for i, host := range hosts {

	}
}

func getNodeDriveTimeoutErrorsMD() MetricDescription {
	return MetricDescription{
		Namespace: nodeMetricNamespace,
		Subsystem: driveSubsystem,
		Name:      "errors_timeout",
		Help:      "Total number of drive timeout errors since server start",
		Type:      counterMetric,
	}
}

func getNodeDriveIOErrorsMD() MetricDescription {
	return MetricDescription{
		Namespace: nodeMetricNamespace,

	}
	if cache.status == scanStateSuccess || cache.status == scanStateStarted {
		if time.Since(cache.lastUpdate) > metacacheMaxRunningAge {
			// We got a stale entry, mark error on handling server.
			err := fmt.Errorf("timeout: list %s not updated", cache.id)
			cache.error = err.Error()
			cache.status = scanStateError
			rpc.UpdateMetacacheListing(ctx, cache)
			return err
		}
		return nil
	}
	if cache.error != "" {

		Description:    "Cannot respond to plain-text request from TLS-encrypted server",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrRequestTimedout: {
		Code:           "RequestTimeout",
		Description:    "A timeout occurred while trying to lock a resource, please reduce your request rate",
		HTTPStatusCode: http.StatusServiceUnavailable,
	},
	ErrClientDisconnected: {
		Code:           "ClientDisconnected",

//
//	querystring = X-Amz-Algorithm=algorithm
//	querystring += &X-Amz-Credential= urlencode(accessKey + '/' + credential_scope)
//	querystring += &X-Amz-Date=date
//	querystring += &X-Amz-Expires=timeout interval
//	querystring += &X-Amz-SignedHeaders=signed_headers
//	querystring += &X-Amz-Signature=signature
//
// verifies if any of the necessary query params are missing in the presigned request.

	sconfig.Producer.Retry.Max = 2
	sconfig.Producer.Retry.Backoff = (10 * time.Second)
	sconfig.Producer.Return.Successes = true
	sconfig.Producer.Return.Errors = true
	sconfig.Producer.RequiredAcks = 1
	sconfig.Producer.Timeout = (10 * time.Second)
	sconfig.Net.ReadTimeout = (10 * time.Second)
	sconfig.Net.DialTimeout = (10 * time.Second)
	sconfig.Net.WriteTimeout = (10 * time.Second)
	sconfig.Metadata.Retry.Max = 1

            "uid": "${DS_PROMETHEUS}"
          },
          "exemplar": true,
          "expr": "minio_node_drive_errors_timeout{job=~\"$scrape_jobs\",server=\"$server\"}",
          "interval": "",
          "legendFormat": "[{{drive}}]",
          "refId": "B"
        }
      ],
      "title": "Drive Timeout Errors",
      "type": "timeseries"
    },
    {
      "datasource": {
        "type": "prometheus",