code: func (s *Client) Set(stat string, value string, rate float32) error {
  	if !s.includeStat(rate) {
  		return nil
  	}
  
  	return s.submit(stat, "", value, "|s", rate)
  }
docs: // Set submits a stats set type
  // stat is a string name for the metric.
  // value is the string value
  // rate is the sample rate (0.0 to 1.0).