func (l *ReplicationLastHour) addsize(sz int64) {
	min := time.Now().Unix() / 60
	l.forwardTo(min)
	winIdx := min % 60
	l.Totals[winIdx].merge(AccElem{Total: min, Size: sz, N: 1})
	l.LastMin = min
}

// Merge all recorded counts of last hour into one
func (l *ReplicationLastHour) getTotal() AccElem {
	var res AccElem
	min := time.Now().Unix() / 60
	l.forwardTo(min)
	for _, elem := range l.Totals[:] {