code: func (t *Target) Metadata(metric string) (MetricMetadata, bool) {
  	t.mtx.RLock()
  	defer t.mtx.RUnlock()
  
  	if t.metadata == nil {
  		return MetricMetadata{}, false
  	}
  	return t.metadata.getMetadata(metric)
  }
docs: // Metadata returns type and help metadata for the given metric.