promql/parse.go
func (p *parser) labelSet() labels.Labels {
	set := []labels.Label{}
	for _, lm := range p.labelMatchers(ItemEQL) {
		set = append(set, labels.Label{Name: lm.Name, Value: lm.Value})
	}
	return labels.New(set...)
}
func (p *parser) labelSet() labels.Labels {
	set := []labels.Label{}
	for _, lm := range p.labelMatchers(ItemEQL) {
		set = append(set, labels.Label{Name: lm.Name, Value: lm.Value})
	}
	return labels.New(set...)
}
// labelSet parses a set of label matchers
//
//		'{' [ <labelname> '=' <match_string>, ... ] '}'
//