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Fix CumulativeCount value of +Inf bucket created from exemplar #1148

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merged 4 commits into from Oct 13, 2022
Merged

Fix CumulativeCount value of +Inf bucket created from exemplar #1148

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65f2ab6
Fix `CumulativeCount` value of `+Inf` bucket created from exemplar
balintzs Oct 12, 2022
80a1737
Update prometheus/metric_test.go
balintzs Oct 13, 2022
9c6dbbb
Clarify description of implicit `+Inf` bucket count
balintzs Oct 13, 2022
0b02476
Fix test variables
balintzs Oct 13, 2022
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2 changes: 1 addition & 1 deletion prometheus/metric.go
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Expand Up @@ -187,7 +187,7 @@ func (m *withExemplarsMetric) Write(pb *dto.Metric) error {
} else {
// The +Inf bucket should be explicitly added if there is an exemplar for it, similar to non-const histogram logic in https://github.com/prometheus/client_golang/blob/main/prometheus/histogram.go#L357-L365.
b := &dto.Bucket{
CumulativeCount: proto.Uint64(pb.Histogram.Bucket[len(pb.Histogram.GetBucket())-1].GetCumulativeCount()),
CumulativeCount: proto.Uint64(pb.Histogram.GetSampleCount()),
UpperBound: proto.Float64(math.Inf(1)),
Exemplar: e,
}
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10 changes: 7 additions & 3 deletions prometheus/metric_test.go
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Expand Up @@ -79,10 +79,14 @@ func TestWithExemplarsMetric(t *testing.T) {
}
}

infBucket := metric.GetHistogram().Bucket[len(metric.GetHistogram().Bucket)-1].GetUpperBound()
infBucket := metric.GetHistogram().Bucket[len(metric.GetHistogram().Bucket)-1]

if infBucket != math.Inf(1) {
t.Errorf("want %v, got %v", math.Inf(1), infBucket)
if upperBound := infBucket.GetUpperBound(); upperBound != math.Inf(1) {
t.Errorf("want %v, got %v", math.Inf(1), upperBound)
}

if cumulativeCount := infBucket.GetCumulativeCount(); cumulativeCount != 4711 {
t.Errorf("want %v, got %v", 4711, cumulativeCount)
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}
})
}