code: func (a *API) FetchCheckBundleMetrics(cid CIDType) (*CheckBundleMetrics, error) {
  	if cid == nil || *cid == "" {
  		return nil, fmt.Errorf("Invalid check bundle metrics CID [none]")
  	}
  
  	metricsCID := string(*cid)
  
  	matched, err := regexp.MatchString(config.CheckBundleMetricsCIDRegex, metricsCID)
  	if err != nil {
  		return nil, err
  	}
  	if !matched {
  		return nil, fmt.Errorf("Invalid check bundle metrics CID [%s]", metricsCID)
  	}
  
  	result, err := a.Get(metricsCID)
  	if err != nil {
  		return nil, err
  	}
  
  	if a.Debug {
  		a.Log.Printf("[DEBUG] fetch check bundle metrics, received JSON: %s", string(result))
  	}
  
  	metrics := &CheckBundleMetrics{}
  	if err := json.Unmarshal(result, metrics); err != nil {
  		return nil, err
  	}
  
  	return metrics, nil
  }
docs: // FetchCheckBundleMetrics retrieves metrics for the check bundle with passed cid.