"Count of online drives in the cluster")
	healthDrivesCountMD = NewGaugeMD(healthDrivesCount,
		"Count of all drives in the cluster")
)

// loadClusterHealthDriveMetrics - `MetricsLoaderFn` for cluster storage drive metrics
// such as online, offline and total drives.
func loadClusterHealthDriveMetrics(ctx context.Context, m MetricValues,
	c *metricsCache,
) error {
	clusterDriveMetrics, _ := c.clusterDriveMetrics.Get()

			healthNodesOnlineCountMD,

			healthCapacityRawTotalBytesMD,
			healthCapacityRawFreeBytesMD,
			healthCapacityUsableTotalBytesMD,
			healthCapacityUsableFreeBytesMD,
		},
		JoinLoaders(loadClusterHealthDriveMetrics,
			loadClusterHealthNodeMetrics,
			loadClusterHealthCapacityMetrics),
	)

	clusterUsageObjectsMG := NewMetricsGroup(clusterUsageObjectsCollectorPath,
		[]MetricDescriptor{