code: func (r *MeterRegistry) Get(name string) *Meter {
  	if m, ok := r.meters.Load(name); ok {
  		return m.(*Meter)
  	}
  	m, _ := r.meters.LoadOrStore(name, new(Meter))
  	return m.(*Meter)
  }
docs: // Get gets (or creates) a meter by name.