Method String

pkg/traceql/engine_metrics.go:283–309

String returns the prometheus-formatted version of the labels. Which is downcasting the typed TraceQL values to strings, with some special casing.

()

// String returns the prometheus-formatted version of the labels. Which is downcasting
// the typed TraceQL values to strings, with some special casing.
func (ls Labels) String() string {
	promLabels := labels.NewBuilder(labels.EmptyLabels())
	for _, l := range ls {
		var promValue string
		switch l.Value.Type {
		case TypeNil:
			promValue = "<nil>"
		case TypeString:
			s := l.Value.EncodeToString(false)
			switch s {
			case "nil":
				promValue = "<nil>"
			case "":
				promValue = "<empty>"
			default:
				promValue = s
			}
		case TypeInt:
			promValue = "int(" + l.Value.EncodeToString(false) + ")"
		default:
			promValue = l.Value.EncodeToString(false)
		}
		promLabels.Set(l.Name, promValue)
	}

	return promLabels.Labels().String()
}

func (ls Labels) MapKey() SeriesMapKey {
	key := SeriesMapKey{}