defer t.lastDayMu.Unlock()

	if _, ok := t.lastDayStats[tier]; !ok {
		t.lastDayStats[tier] = &lastDayTierStats{}
	}
	t.lastDayStats[tier].addStats(ts)
}

func (t *transitionState) getDailyAllTierStats() DailyAllTierStats {
	t.lastDayMu.RLock()
	defer t.lastDayMu.RUnlock()

	res := make(DailyAllTierStats, len(t.lastDayStats))
	for tier, st := range t.lastDayStats {
		res[tier] = st.clone()
	}

		go func(index int) {
			defer wg.Done()
			lastDayStats[index], errs[index] = sys.peerClients[index].GetLastDayTierStats(ctx)
		}(index)
	}

	wg.Wait()
	merged := globalTransitionState.getDailyAllTierStats()
	for i, stat := range lastDayStats {
		if errs[i] != nil {
			peersLogOnceIf(ctx, fmt.Errorf("failed to fetch last day tier stats: %w", errs[i]), sys.peerClients[i].host.String())
			continue
		}

	if objAPI := newObjectLayerFn(); objAPI == nil || globalTransitionState == nil {
		return nil, grid.NewRemoteErr(errServerNotInitialized)
	}

	result := globalTransitionState.getDailyAllTierStats()
	return &result, nil
}

func (s *peerRESTServer) DriveSpeedTestHandler(w http.ResponseWriter, r *http.Request) {
	if !s.IsValid(w, r) {
		s.writeErrorResponse(w, errors.New("invalid request"))