code: func NewRegisteredMeter(name string, r Registry) Meter {
  	c := NewMeter()
  	if nil == r {
  		r = DefaultRegistry
  	}
  	r.Register(name, c)
  	return c
  }
docs: // NewRegisteredMeter constructs and registers a new StandardMeter
  // and launches a goroutine.
  // Be sure to unregister the meter from the registry once it is of no use to
  // allow for garbage collection.