code: func (e *Timing) Update(e2 Event) error {
  	if e.Type() != e2.Type() {
  		return fmt.Errorf("statsd event type conflict: %s vs %s ", e.String(), e2.String())
  	}
  	p := e2.Payload().(map[string]int64)
  	e.Count += p["cnt"]
  	e.Value += p["val"]
  	e.Min = minInt64(e.Min, p["min"])
  	e.Max = maxInt64(e.Max, p["max"])
  	return nil
  }
docs: // Update the event with metrics coming from a new one of the same type and with the same key