resourceMetricsCacheInterval      = time.Minute

	// drive stats
	totalInodes    MetricName = "total_inodes"
	readsPerSec    MetricName = "reads_per_sec"
	writesPerSec   MetricName = "writes_per_sec"
	readsKBPerSec  MetricName = "reads_kb_per_sec"
	writesKBPerSec MetricName = "writes_kb_per_sec"
	readsAwait     MetricName = "reads_await"
	writesAwait    MetricName = "writes_await"
	percUtil       MetricName = "perc_util"

          "interval": "1m",
          "intervalFactor": 2,
          "legendFormat": "{{server,endpoint}}",
          "refId": "A"
        }
      ],
      "title": "Link Downtime Duration (sec)",
      "type": "timeseries"
    },
    {
      "datasource": {
        "type": "prometheus",
        "uid": "${DS_PROMETHEUS}"
      },
      "fieldConfig": {
        "defaults": {

	if err != nil {
		return errTransitionInvalidDate
	}
	// Allow only date timestamp specifying midnight GMT
	hr, min, sec := trnDate.Clock()
	nsec := trnDate.Nanosecond()
	loc := trnDate.Location()
	if !(hr == 0 && min == 0 && sec == 0 && nsec == 0 && loc.String() == time.UTC.String()) {
		return errTransitionDateNotMidnight
	}

	*tDate = TransitionDate{trnDate}
	return nil
}

| `minio_cluster_replication_average_transfer_rate`          | Average replication transfer rate in bytes/sec                                                           |
| `minio_cluster_replication_max_transfer_rate`              | Maximum replication transfer rate in bytes/sec seen since server start                                   |

          "legendFormat": "{{server,endpoint}}",
          "refId": "A"
        }
      ],
      "thresholds": [],
      "timeRegions": [],
      "title": "Link Downtime Duration (sec)",
      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
      },
      "type": "graph",
      "xaxis": {
        "mode": "time",

		return nil, err
	}
	api.SetAppInfo("minio-replication-target", ReleaseTag+" "+tcfg.Arn)

	hcDuration := defaultHealthCheckDuration
	if tcfg.HealthCheckDuration >= 1 { // require minimum health check duration of 1 sec.
		hcDuration = tcfg.HealthCheckDuration
	}
	tc := &TargetClient{
		Client:              api,
		healthCheckDuration: hcDuration,
		replicateSync:       tcfg.ReplicationSync,

| `minio_system_drive_reads_per_sec`             | `gauge`   | Reads per second on a drive                                        | `drive,set_index,drive_index,pool_index,server`     |
| `minio_system_drive_reads_kb_per_sec`          | `gauge`   | Kilobytes read per second on a drive                               | `drive,set_index,drive_index,pool_index,server`     |

		Help:      "Average replication transfer rate in bytes/sec",
		Type:      gaugeMetric,
	}
}

func getClusterReplMaxTransferRateMD() MetricDescription {
	return MetricDescription{
		Namespace: clusterMetricNamespace,
		Subsystem: replicationSubsystem,
		Name:      maxTransferRate,
		Help:      "Maximum replication transfer rate in bytes/sec seen since server start",
		Type:      gaugeMetric,
	}
}

func (l *lastMinuteLatency) add(t time.Duration) {
	sec := time.Now().Unix()
	l.forwardTo(sec)
	winIdx := sec % 60
	l.Totals[winIdx].add(t)
	l.LastSec = sec
}

// Add  a new duration data
func (l *lastMinuteLatency) addAll(sec int64, a AccElem) {
	l.forwardTo(sec)
	winIdx := sec % 60
	l.Totals[winIdx].merge(a)
	l.LastSec = sec
}

// Merge all recorded latencies of last minute into one

	driveOnlineCount  = "online_count"
	driveCount        = "count"

	// iostat related
	driveReadsPerSec    = "reads_per_sec"
	driveReadsKBPerSec  = "reads_kb_per_sec"
	driveReadsAwait     = "reads_await"
	driveWritesPerSec   = "writes_per_sec"
	driveWritesKBPerSec = "writes_kb_per_sec"
	driveWritesAwait    = "writes_await"
	drivePercUtil       = "perc_util"
)

var (
	driveUsedBytesMD = NewGaugeMD(driveUsedBytes,