in hub/hub.go [436:442]
func sortedInsert(data []*dto.Metric, el *dto.Metric) []*dto.Metric {
index := sort.Search(len(data), func(i int) bool { return *data[i].TimestampMs > *el.TimestampMs })
data = append(data, &dto.Metric{})
copy(data[index+1:], data[index:])
data[index] = el
return data
}