Function Test_Histograms

modules/generator/registry/native_histogram_test.go:39–516

(t *testing.T)

}

func Test_Histograms(t *testing.T) {
	// A single observation has a labelset, a value, and a multiplier.
	type observations []struct {
		lbls       labels.Labels
		value      float64
		multiplier float64
		traceID    string
	}

	// A single collection has a few observations, and some expectations.  This
	// allows the test to track the accumulation of observations over a series of
	// collections.
	type collections []struct {
		observations      observations
		expectedSamples   []sample
		expectedExemplars []exemplarSample
	}

	collectionTimeMs := time.Now().UnixMilli()
	endOfLastMinuteMs := getEndOfLastMinuteMs(collectionTimeMs)

	cases := []struct {
		name        string
		buckets     []float64
		collections collections
		// native histogram does not support all features yet
		skipNativeHistogram bool
	}{
		{
			name:    "single collection single observation",
			buckets: []float64{1, 2},
			collections: collections{
				{
					observations: observations{
						{
							lbls:       buildTestLabels([]string{"label"}, []string{"value-1"}),
							value:      1.0,
							multiplier: 1.0,
							traceID:    "trace-1",
						},
					},
					expectedSamples: []sample{
						newSample(map[string]string{"__name__": "test_histogram_count", "label": "value-1"}, endOfLastMinuteMs, 0), // zero count at the beginning
						newSample(map[string]string{"__name__": "test_histogram_count", "label": "value-1"}, collectionTimeMs, 1),
						newSample(map[string]string{"__name__": "test_histogram_sum", "label": "value-1"}, collectionTimeMs, 1),
						newSample(map[string]string{"__name__": "test_histogram_bucket", "label": "value-1", "le": "1"}, endOfLastMinuteMs, 0),
						newSample(map[string]string{"__name__": "test_histogram_bucket", "label": "value-1", "le": "1"}, collectionTimeMs, 1),
						newSample(map[string]string{"__name__": "test_histogram_bucket", "label": "value-1", "le": "2"}, endOfLastMinuteMs, 0),
						newSample(map[string]string{"__name__": "test_histogram_bucket", "label": "value-1", "le": "2"}, collectionTimeMs, 1),
						newSample(map[string]string{"__name__": "test_histogram_bucket", "label": "value-1", "le": "+Inf"}, endOfLastMinuteMs, 0),
						newSample(map[string]string{"__name__": "test_histogram_bucket", "label": "value-1", "le": "+Inf"}, collectionTimeMs, 1),
					},
					expectedExemplars: []exemplarSample{
						newExemplar(map[string]string{"__name__": "test_histogram_bucket", "label": "value-1", "le": "1"}, exemplar.Exemplar{
							Labels: labels.FromMap(map[string]string{"trace_id": "trace-1"}),
							Value:  1.0,
							Ts:     collectionTimeMs,
						}),