func()

in otelcollector/prometheusreceiver/internal/metricfamily.go [464:531]

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

func (mf *metricFamily) appendMetric(metrics pmetric.MetricSlice, trimSuffixes bool) {
	metric := pmetric.NewMetric()
	// Trims type and unit suffixes from metric name
	name := mf.name
	if trimSuffixes {
		name = prometheus.TrimPromSuffixes(name, mf.mtype, mf.metadata.Unit)
	}
	metric.SetName(name)
	metric.SetDescription(mf.metadata.Help)
	metric.SetUnit(prometheus.UnitWordToUCUM(mf.metadata.Unit))
	metric.Metadata().PutStr(prometheus.MetricMetadataTypeKey, string(mf.metadata.Type))

	var pointCount int

	switch mf.mtype {
	case pmetric.MetricTypeHistogram:
		histogram := metric.SetEmptyHistogram()
		histogram.SetAggregationTemporality(pmetric.AggregationTemporalityCumulative)
		hdpL := histogram.DataPoints()
		for _, mg := range mf.groupOrders {
			mg.toDistributionPoint(hdpL)
		}
		pointCount = hdpL.Len()

	case pmetric.MetricTypeSummary:
		summary := metric.SetEmptySummary()
		sdpL := summary.DataPoints()
		for _, mg := range mf.groupOrders {
			mg.toSummaryPoint(sdpL)
		}
		pointCount = sdpL.Len()

	case pmetric.MetricTypeSum:
		sum := metric.SetEmptySum()
		sum.SetAggregationTemporality(pmetric.AggregationTemporalityCumulative)
		sum.SetIsMonotonic(mf.isMonotonic)
		sdpL := sum.DataPoints()
		for _, mg := range mf.groupOrders {
			mg.toNumberDataPoint(sdpL)
		}
		pointCount = sdpL.Len()

	case pmetric.MetricTypeExponentialHistogram:
		histogram := metric.SetEmptyExponentialHistogram()
		histogram.SetAggregationTemporality(pmetric.AggregationTemporalityCumulative)
		hdpL := histogram.DataPoints()
		for _, mg := range mf.groupOrders {
			mg.toExponentialHistogramDataPoints(hdpL)
		}
		pointCount = hdpL.Len()

	case pmetric.MetricTypeEmpty, pmetric.MetricTypeGauge:
		fallthrough
	default: // Everything else should be set to a Gauge.
		gauge := metric.SetEmptyGauge()
		gdpL := gauge.DataPoints()
		for _, mg := range mf.groupOrders {
			mg.toNumberDataPoint(gdpL)
		}
		pointCount = gdpL.Len()
	}

	if pointCount == 0 {
		return
	}

	metric.MoveTo(metrics.AppendEmpty())
}