func()

in exporter/collector/metrics.go [1459:1513]

• 52 lines of code
• 13 McCabe index (conditional complexity)

func (m *metricMapper) labelDescriptors(
	pm pmetric.Metric,
	extraLabels labels,
) []*label.LabelDescriptor {
	// TODO - allow customization of label descriptions.
	result := []*label.LabelDescriptor{}
	for key := range extraLabels {
		result = append(result, &label.LabelDescriptor{
			Key: sanitizeKey(key),
		})
	}

	seenKeys := map[string]struct{}{}
	addAttributes := func(attr pcommon.Map) {
		attr.Range(func(key string, _ pcommon.Value) bool {
			// Skip keys that have already been set
			if _, ok := seenKeys[sanitizeKey(key)]; ok {
				return true
			}
			result = append(result, &label.LabelDescriptor{
				Key: sanitizeKey(key),
			})
			seenKeys[sanitizeKey(key)] = struct{}{}
			return true
		})
	}
	switch pm.Type() {
	case pmetric.MetricTypeGauge:
		points := pm.Gauge().DataPoints()
		for i := 0; i < points.Len(); i++ {
			addAttributes(points.At(i).Attributes())
		}
	case pmetric.MetricTypeSum:
		points := pm.Sum().DataPoints()
		for i := 0; i < points.Len(); i++ {
			addAttributes(points.At(i).Attributes())
		}
	case pmetric.MetricTypeSummary:
		points := pm.Summary().DataPoints()
		for i := 0; i < points.Len(); i++ {
			addAttributes(points.At(i).Attributes())
		}
	case pmetric.MetricTypeHistogram:
		points := pm.Histogram().DataPoints()
		for i := 0; i < points.Len(); i++ {
			addAttributes(points.At(i).Attributes())
		}
	case pmetric.MetricTypeExponentialHistogram:
		points := pm.ExponentialHistogram().DataPoints()
		for i := 0; i < points.Len(); i++ {
			addAttributes(points.At(i).Attributes())
		}
	}
	return result
}