code: func (client *Client) SearchMetrics(search string) ([]string, error) {
  	var out reqSearch
  	if err := client.doJsonRequest("GET", "/v1/search?q=metrics:"+search, nil, &out); err != nil {
  		return nil, err
  	}
  	return out.Results.Metrics, nil
  }
docs: // SearchMetrics searches through the metrics facet, returning matching ones.