)

	sinfo := objLayer.StorageInfo(GlobalContext, true)

	// Report total usable capacity
	ch <- prometheus.MustNewConstMetric(
		prometheus.NewDesc(
			prometheus.BuildFQName(minioNamespace, "capacity_usable", "total"),
			"Total usable capacity online in the cluster",
			nil, nil),
		prometheus.GaugeValue,
		float64(GetTotalUsableCapacity(server.Disks, sinfo)),
	)

	// Report total usable capacity free

)

const (
	cacheSubsystem            MetricSubsystem = "cache"
	capacityRawSubsystem      MetricSubsystem = "capacity_raw"
	capacityUsableSubsystem   MetricSubsystem = "capacity_usable"
	driveSubsystem            MetricSubsystem = "drive"
	interfaceSubsystem        MetricSubsystem = "if"
	memSubsystem              MetricSubsystem = "mem"
	cpuSubsystem              MetricSubsystem = "cpu_avg"