var lastOnline time.Time
					var offline time.Duration
					//	var deploymentID string
					sys.hMutex.RLock()
					prev, ok := sys.hc[result.Endpoint.Host]
					sys.hMutex.RUnlock()
					if ok {
						if prev.Online != result.Online || !result.Online {
							if !prev.lastHCAt.IsZero() {
								offline = time.Since(prev.lastHCAt) + prev.offlineDuration
							} else {

	// If not set the client will not keep track of health.
	// Calling this returns true or false if the target
	// is online or offline.
	HealthCheckFn func() bool

	// HealthCheckRetryUnit will be used to calculate the exponential
	// backoff when trying to reconnect to an offline node
	HealthCheckReconnectUnit time.Duration

	// HealthCheckTimeout determines timeout for each call.
	HealthCheckTimeout time.Duration

		prometheus.NewDesc(
			prometheus.BuildFQName(minioNamespace, "nodes", "online"),
			"Total number of MinIO nodes online",
			nil, nil),
		prometheus.GaugeValue,
		float64(nodesUp),
	)
	ch <- prometheus.MustNewConstMetric(
		prometheus.NewDesc(
			prometheus.BuildFQName(minioNamespace, "nodes", "offline"),
			"Total number of MinIO nodes offline",
			nil, nil),
		prometheus.GaugeValue,
		float64(nodesDown),
	)

| `minio_node_replication_link_online`                    | Reports whether the replication link is online (1) or offline (0).                                       |
| `minio_node_replication_link_offline_duration_seconds`  | Total duration of replication link being offline in seconds since last offline event                     |

	// Return error when quorum unformatted disks - indicating we are
	// waiting for first server to be online.
	unformattedDisks := quorumUnformattedDisks(sErrs)
	if unformattedDisks && !firstDisk {
		return nil, errNotFirstDisk
	}

	// Return error when quorum unformatted disks but waiting for rest
	// of the servers to be online.
	if unformattedDisks && firstDisk {
		return nil, errFirstDiskWait
	}

		if di.RootDisk {
			rootDiskCount++
		}
	}

	// Count offline disks as well to ensure consistent
	// reportability of offline drives on local setups.
	if len(disksInfo) == (rootDiskCount + offlineDisks.Sum()) {
		// Success.
		return onlineDisks, offlineDisks
	}

	// Root disk should be considered offline
	for i := range disksInfo {
		ep := disksInfo[i].Endpoint
		if disksInfo[i].RootDisk {

          "hide": false,
          "instant": true,
          "legendFormat": ".",
          "range": false,
          "refId": "B"
        }
      ],
      "title": "Total Online/Offline Drives",
      "type": "gauge"
    },
    {
      "datasource": {
        "type": "prometheus",
        "uid": "${DS_PROMETHEUS}"
      },
      "fieldConfig": {
        "defaults": {

			linkOnline := MetricV2{
				Description: getClusterRepLinkOnlineMD(),
				VariableLabels: map[string]string{
					"endpoint": ep,
				},
			}
			online := Offline
			if health.Online {
				online = Online
			}
			linkOnline.Value = float64(online)
			ml = append(ml, linkOnline)
			offlineDuration := MetricV2{
				Description: getClusterRepLinkCurrOfflineDurationMD(),
				VariableLabels: map[string]string{

	}

	// count the number of offline disks
	offline := 0
	for i := 0; i < len(errs); i++ {
		var found bool
		switch {
		case errors.Is(errs[i], errDiskNotFound):
			found = true
		default:
			for p := range dataErrsByPart {
				if dataErrsByPart[p][i] == checkPartDiskNotFound {
					found = true
					break
				}
			}
		}
		if found {
			offline++
		}
	}
	if offline > 0 {

        return projectRequired;
    }

    // ----------------------------------------------------------------------
    // Online vs. Offline requirement
    // ----------------------------------------------------------------------

    /**
     * @param requiresOnline <code>true</code> if the Mojo is online, <code>false</code> otherwise.
     */
    public void setOnlineRequired(boolean requiresOnline) {