if globalTierConfigMgr.Empty() {
			return
		}

		dui, err := loadDataUsageFromBackend(ctx, objLayer)
		if err != nil {
			metricsLogIf(ctx, err)
			return
		}
		// data usage has not captured any tier stats yet.
		if dui.TierStats == nil {
			return
		}

		return dui.tierMetrics()
	})
	return mg
}