code: func (e *FAbsolute) Update(e2 Event) error {
  	if e.Type() != e2.Type() {
  		return fmt.Errorf("statsd event type conflict: %s vs %s ", e.String(), e2.String())
  	}
  	e.Values = append(e.Values, e2.Payload().([]float64)...)
  	return nil
  }
docs: // Update the event with metrics coming from a new one of the same type and with the same key