Method ObserveDurationWithExemplar

prometheus/timer.go:70–81

ObserveDurationWithExemplar is like ObserveDuration, but it will also observe exemplar with the duration unless exemplar is nil or provided Observer can't be casted to ExemplarObserver.

(exemplar Labels)

// observe exemplar with the duration unless exemplar is nil or provided Observer can't
// be casted to ExemplarObserver.
func (t *Timer) ObserveDurationWithExemplar(exemplar Labels) time.Duration {
	d := time.Since(t.begin)
	eo, ok := t.observer.(ExemplarObserver)
	if ok && exemplar != nil {
		eo.ObserveWithExemplar(d.Seconds(), exemplar)
		return d
	}
	if t.observer != nil {
		t.observer.Observe(d.Seconds())
	}
	return d
}