loadHealth,
	)
}

func getDiffStats(initialStats, currentStats madmin.DiskIOStats) madmin.DiskIOStats {
	return madmin.DiskIOStats{
		ReadIOs:      currentStats.ReadIOs - initialStats.ReadIOs,
		WriteIOs:     currentStats.WriteIOs - initialStats.WriteIOs,
		ReadSectors:  currentStats.ReadSectors - initialStats.ReadSectors,
		WriteSectors: currentStats.WriteSectors - initialStats.WriteSectors,

)

// loadClusterAuditMetrics - `MetricsLoaderFn` for cluster audit
// such as failed messages and total messages.
func loadClusterAuditMetrics(_ context.Context, m MetricValues, c *metricsCache) error {
	audit := logger.CurrentStats()
	for id, st := range audit {
		labels := []string{targetID, id}
		m.Set(auditFailedMessages, float64(st.FailedMessages), labels...)
		m.Set(auditTargetQueueLength, float64(st.QueueLength), labels...)

// Returned slice may not be modified in any way.
func AuditTargets() []Target {
	swapAuditMuRW.RLock()
	defer swapAuditMuRW.RUnlock()

	res := auditTargets
	return res
}

// CurrentStats returns the current statistics.
func CurrentStats() map[string]types.TargetStats {
	sys := SystemTargets()
	audit := AuditTargets()
	res := make(map[string]types.TargetStats, len(sys)+len(audit))
	cnt := make(map[string]int, len(sys)+len(audit))

func updateDriveIOStats(currentStats madmin.DiskIOStats, latestStats madmin.DiskIOStats, labels map[string]string) {
	sectorSize := uint64(512)
	kib := float64(1 << 10)
	diffInSeconds := time.Now().UTC().Sub(lastDriveStatsRefresh).Seconds()
	if diffInSeconds == 0 {
		// too soon to update the stats
		return
	}
	diffStats := getDiffStats(latestStats, currentStats)

				},
				VariableLabels: map[string]string{"target_id": st.ID.ID, "target_name": st.ID.Name},
				Value:          float64(st.FailedRequests),
			})
		}

		// Audit and system:
		audit := logger.CurrentStats()
		for id, st := range audit {
			metrics = append(metrics, MetricV2{
				Description: MetricDescription{
					Namespace: minioNamespace,
					Subsystem: auditSubsystem,