code: func (cd *ConnectionDetails) RetrySleep() time.Duration {
  	d, err := time.ParseDuration(defaults.String(cd.Options["retry_sleep"], "1ms"))
  	if err != nil {
  		return 1 * time.Millisecond
  	}
  	return d
  }
docs: // RetrySleep returns the amount of time to wait between two connection retries