if ats == nil {
		return nil
	}
	dst := *ats
	dst.Tiers = make(map[string]tierStats, len(ats.Tiers))
	maps.Copy(dst.Tiers, ats.Tiers)
	return &dst
}

func (ats *allTierStats) populateStats(stats map[string]madmin.TierStats) {
	if ats == nil {
		return
	}

	// Update stats for tiers as they become available.
	for tier, st := range ats.Tiers {
		stats[tier] = madmin.TierStats{