code: func (o VirtualDNSUserAnalyticsOptions) encode() string {
  	v := url.Values{}
  	if o.Since != nil {
  		v.Set("since", (*o.Since).UTC().Format(time.RFC3339))
  	}
  	if o.Until != nil {
  		v.Set("until", (*o.Until).UTC().Format(time.RFC3339))
  	}
  	if o.Metrics != nil {
  		v.Set("metrics", strings.Join(o.Metrics, ","))
  	}
  	return v.Encode()
  }
docs: // encode encodes non-nil fields into URL encoded form.