Function ValidateExemplar

pkg/util/validation/validate.go:244–277

ValidateExemplar returns an error if the exemplar is invalid. The returned error may retain the provided series labels.

(validateMetrics *ValidateMetrics, userID string, ls []cortexpb.LabelAdapter, e cortexpb.Exemplar)

// ValidateExemplar returns an error if the exemplar is invalid.
// The returned error may retain the provided series labels.
func ValidateExemplar(validateMetrics *ValidateMetrics, userID string, ls []cortexpb.LabelAdapter, e cortexpb.Exemplar) ValidationError {
	if len(e.Labels) <= 0 {
		validateMetrics.DiscardedExemplars.WithLabelValues(exemplarLabelsMissing, userID).Inc()
		return newExemplarEmtpyLabelsError(ls, []cortexpb.LabelAdapter{}, e.TimestampMs)
	}

	if e.TimestampMs == 0 {
		validateMetrics.DiscardedExemplars.WithLabelValues(exemplarTimestampInvalid, userID).Inc()
		return newExemplarMissingTimestampError(
			ls,
			e.Labels,
			e.TimestampMs,
		)
	}

	// Exemplar label length does not include chars involved in text
	// rendering such as quotes, commas, etc.  See spec and const definition.
	labelSetLen := 0
	for _, l := range e.Labels {
		labelSetLen += utf8.RuneCountInString(l.Name)
		labelSetLen += utf8.RuneCountInString(l.Value)
	}

	if labelSetLen > ExemplarMaxLabelSetLength {
		validateMetrics.DiscardedExemplars.WithLabelValues(exemplarLabelsTooLong, userID).Inc()
		return newExemplarLabelLengthError(
			ls,
			e.Labels,
			e.TimestampMs,
		)
	}

	return nil
}

// ValidateMetricName checks that ls has a valid non-empty metric name when limits.EnforceMetricName is true.
// It returns (nil, "") when valid, or (error, discardReason) when invalid.