code: func (r *Request) LabelsSelectorParam(s labels.Selector) *Request {
  	if r.err != nil {
  		return r
  	}
  	if s == nil {
  		return r
  	}
  	if s.Empty() {
  		return r
  	}
  	return r.setParam(unversioned.LabelSelectorQueryParam(r.groupVersion.String()), s.String())
  }
docs: // LabelsSelectorParam adds the given selector as a query parameter