func()

in collector/receiver/prometheusreceiver/internal/transaction.go [156:184]

• 23 lines of code
• 6 McCabe index (conditional complexity)

func (t *transaction) AppendExemplar(ref storage.SeriesRef, l labels.Labels, e exemplar.Exemplar) (storage.SeriesRef, error) {
	select {
	case <-t.ctx.Done():
		return 0, errTransactionAborted
	default:
	}

	if t.isNew {
		if err := t.initTransaction(l); err != nil {
			return 0, err
		}
	}

	l = l.WithoutEmpty()

	if dupLabel, hasDup := l.HasDuplicateLabelNames(); hasDup {
		return 0, fmt.Errorf("invalid sample: non-unique label names: %q", dupLabel)
	}

	mn := l.Get(model.MetricNameLabel)
	if mn == "" {
		return 0, errMetricNameNotFound
	}

	mf := t.getOrCreateMetricFamily(mn)
	mf.addExemplar(t.getSeriesRef(l, mf.mtype), e)

	return 0, nil
}