code: func (client *Client) ViewMetricMetadata(mn string) (*MetricMetadata, error) {
  	var out MetricMetadata
  	if err := client.doJsonRequest("GET", fmt.Sprintf("/v1/metrics/%s", mn), nil, &out); err != nil {
  		return nil, err
  	}
  	return &out, nil
  }
docs: // ViewMetricMetadata allows you to get metadata about a specific metric.