ctx := r.Context()

	objAPI, _ := validateAdminReq(ctx, w, r, policy.ListTierAction)
	if objAPI == nil {
		return
	}

	tiers := globalTierConfigMgr.ListTiers()
	data, err := json.Marshal(tiers)
	if err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	w.Header().Set(tierCfgRefreshAtHdr, globalTierConfigMgr.refreshedAt().String())

			return
		}
		switch msgp.UnsafeString(field) {
		case "Tiers":
			var zb0002 uint32
			zb0002, err = dc.ReadMapHeader()
			if err != nil {
				err = msgp.WrapError(err, "Tiers")
				return
			}
			if z.Tiers == nil {
				z.Tiers = make(map[string]madmin.TierConfig, zb0002)
			} else if len(z.Tiers) > 0 {
				for key := range z.Tiers {
					delete(z.Tiers, key)
				}
			}
			for zb0002 > 0 {
				zb0002--

	// Deprecated kept here for backward compatibility reasons.
	BucketSizes map[string]uint64 `json:"bucketsSizes"`

	// TierStats contains per-tier stats of all configured remote tiers
	TierStats *allTierStats `json:"tierStats,omitempty"`
}

func (dui DataUsageInfo) tierStats() []madmin.TierInfo {
	if dui.TierStats == nil {
		return nil
	}

	if globalTierConfigMgr.Empty() {

Lifecycle transition functionality provided in [bucket lifecycle guide](https://github.com/minio/minio/master/docs/bucket/lifecycle/README.md) allows tiering of content from MinIO object store to public clouds or other MinIO clusters.

Transition tiers can be added to MinIO using `mc admin tier add` command to associate a `gcs`, `s3` or `azure` bucket or prefix path on a bucket to the tier name.