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exporter_test.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package prometheus
import (
"context"
"errors"
"io"
"os"
"sync"
"testing"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/testutil"
dto "github.com/prometheus/client_model/go"
"github.com/prometheus/common/model"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
otelmetric "go.opentelemetry.io/otel/metric"
"go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/resource"
semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
"go.opentelemetry.io/otel/trace"
)
func TestPrometheusExporter(t *testing.T) {
testCases := []struct {
name string
emptyResource bool
customResourceAttrs []attribute.KeyValue
recordMetrics func(ctx context.Context, meter otelmetric.Meter)
options []Option
expectedFile string
enableUTF8 bool
}{
{
name: "counter",
expectedFile: "testdata/counter.txt",
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter, err := meter.Float64Counter(
"foo",
otelmetric.WithDescription("a simple counter"),
otelmetric.WithUnit("s"),
)
require.NoError(t, err)
counter.Add(ctx, 5, opt)
counter.Add(ctx, 10.3, opt)
counter.Add(ctx, 9, opt)
attrs2 := attribute.NewSet(
attribute.Key("A").String("D"),
attribute.Key("C").String("B"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter.Add(ctx, 5, otelmetric.WithAttributeSet(attrs2))
},
},
{
name: "counter that already has the unit suffix",
expectedFile: "testdata/counter.txt",
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter, err := meter.Float64Counter(
"foo.seconds",
otelmetric.WithDescription("a simple counter"),
otelmetric.WithUnit("s"),
)
require.NoError(t, err)
counter.Add(ctx, 5, opt)
counter.Add(ctx, 10.3, opt)
counter.Add(ctx, 9, opt)
attrs2 := attribute.NewSet(
attribute.Key("A").String("D"),
attribute.Key("C").String("B"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter.Add(ctx, 5, otelmetric.WithAttributeSet(attrs2))
},
},
{
name: "counter that already has a total suffix",
expectedFile: "testdata/counter.txt",
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter, err := meter.Float64Counter(
"foo.total",
otelmetric.WithDescription("a simple counter"),
otelmetric.WithUnit("s"),
)
require.NoError(t, err)
counter.Add(ctx, 5, opt)
counter.Add(ctx, 10.3, opt)
counter.Add(ctx, 9, opt)
attrs2 := attribute.NewSet(
attribute.Key("A").String("D"),
attribute.Key("C").String("B"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter.Add(ctx, 5, otelmetric.WithAttributeSet(attrs2))
},
},
{
name: "counter with suffixes disabled",
expectedFile: "testdata/counter_disabled_suffix.txt",
options: []Option{WithoutCounterSuffixes()},
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter, err := meter.Float64Counter(
"foo",
otelmetric.WithDescription("a simple counter without a total suffix"),
otelmetric.WithUnit("s"),
)
require.NoError(t, err)
counter.Add(ctx, 5, opt)
counter.Add(ctx, 10.3, opt)
counter.Add(ctx, 9, opt)
attrs2 := attribute.NewSet(
attribute.Key("A").String("D"),
attribute.Key("C").String("B"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter.Add(ctx, 5, otelmetric.WithAttributeSet(attrs2))
},
},
{
name: "gauge",
expectedFile: "testdata/gauge.txt",
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
)
gauge, err := meter.Float64UpDownCounter(
"bar",
otelmetric.WithDescription("a fun little gauge"),
otelmetric.WithUnit("1"),
)
require.NoError(t, err)
gauge.Add(ctx, 1.0, opt)
gauge.Add(ctx, -.25, opt)
},
},
{
name: "histogram",
expectedFile: "testdata/histogram.txt",
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
)
histogram, err := meter.Float64Histogram(
"histogram_baz",
otelmetric.WithDescription("a very nice histogram"),
otelmetric.WithUnit("By"),
)
require.NoError(t, err)
histogram.Record(ctx, 23, opt)
histogram.Record(ctx, 7, opt)
histogram.Record(ctx, 101, opt)
histogram.Record(ctx, 105, opt)
},
},
{
name: "sanitized attributes to labels",
expectedFile: "testdata/sanitized_labels.txt",
options: []Option{WithoutUnits()},
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
// exact match, value should be overwritten
attribute.Key("A.B").String("X"),
attribute.Key("A.B").String("Q"),
// unintended match due to sanitization, values should be concatenated
attribute.Key("C.D").String("Y"),
attribute.Key("C/D").String("Z"),
)
counter, err := meter.Float64Counter(
"foo",
otelmetric.WithDescription("a sanitary counter"),
// This unit is not added to
otelmetric.WithUnit("By"),
)
require.NoError(t, err)
counter.Add(ctx, 5, opt)
counter.Add(ctx, 10.3, opt)
counter.Add(ctx, 9, opt)
},
},
{
name: "invalid instruments are renamed",
expectedFile: "testdata/sanitized_names.txt",
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
)
// Valid.
gauge, err := meter.Float64UpDownCounter("bar", otelmetric.WithDescription("a fun little gauge"))
require.NoError(t, err)
gauge.Add(ctx, 100, opt)
gauge.Add(ctx, -25, opt)
// Invalid, will be renamed.
gauge, err = meter.Float64UpDownCounter("invalid.gauge.name", otelmetric.WithDescription("a gauge with an invalid name"))
require.NoError(t, err)
gauge.Add(ctx, 100, opt)
counter, err := meter.Float64Counter("0invalid.counter.name", otelmetric.WithDescription("a counter with an invalid name"))
require.ErrorIs(t, err, metric.ErrInstrumentName)
counter.Add(ctx, 100, opt)
histogram, err := meter.Float64Histogram("invalid.hist.name", otelmetric.WithDescription("a histogram with an invalid name"))
require.NoError(t, err)
histogram.Record(ctx, 23, opt)
},
},
{
name: "empty resource",
emptyResource: true,
expectedFile: "testdata/empty_resource.txt",
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter, err := meter.Float64Counter("foo", otelmetric.WithDescription("a simple counter"))
require.NoError(t, err)
counter.Add(ctx, 5, opt)
counter.Add(ctx, 10.3, opt)
counter.Add(ctx, 9, opt)
},
},
{
name: "custom resource",
customResourceAttrs: []attribute.KeyValue{
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
},
expectedFile: "testdata/custom_resource.txt",
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter, err := meter.Float64Counter("foo", otelmetric.WithDescription("a simple counter"))
require.NoError(t, err)
counter.Add(ctx, 5, opt)
counter.Add(ctx, 10.3, opt)
counter.Add(ctx, 9, opt)
},
},
{
name: "without target_info",
options: []Option{WithoutTargetInfo()},
expectedFile: "testdata/without_target_info.txt",
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter, err := meter.Float64Counter("foo", otelmetric.WithDescription("a simple counter"))
require.NoError(t, err)
counter.Add(ctx, 5, opt)
counter.Add(ctx, 10.3, opt)
counter.Add(ctx, 9, opt)
},
},
{
name: "without scope_info",
options: []Option{WithoutScopeInfo()},
expectedFile: "testdata/without_scope_info.txt",
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
)
gauge, err := meter.Int64UpDownCounter(
"bar",
otelmetric.WithDescription("a fun little gauge"),
otelmetric.WithUnit("1"),
)
require.NoError(t, err)
gauge.Add(ctx, 2, opt)
gauge.Add(ctx, -1, opt)
},
},
{
name: "without scope_info and target_info",
options: []Option{WithoutScopeInfo(), WithoutTargetInfo()},
expectedFile: "testdata/without_scope_and_target_info.txt",
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
)
counter, err := meter.Int64Counter(
"bar",
otelmetric.WithDescription("a fun little counter"),
otelmetric.WithUnit("By"),
)
require.NoError(t, err)
counter.Add(ctx, 2, opt)
counter.Add(ctx, 1, opt)
},
},
{
name: "with namespace",
expectedFile: "testdata/with_namespace.txt",
options: []Option{
WithNamespace("test"),
},
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter, err := meter.Float64Counter("foo", otelmetric.WithDescription("a simple counter"))
require.NoError(t, err)
counter.Add(ctx, 5, opt)
counter.Add(ctx, 10.3, opt)
counter.Add(ctx, 9, opt)
},
},
{
name: "with resource attributes filter",
expectedFile: "testdata/with_resource_attributes_filter.txt",
options: []Option{
WithResourceAsConstantLabels(attribute.NewDenyKeysFilter()),
},
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter, err := meter.Float64Counter("foo", otelmetric.WithDescription("a simple counter"))
require.NoError(t, err)
counter.Add(ctx, 5, opt)
counter.Add(ctx, 10.1, opt)
counter.Add(ctx, 9.8, opt)
},
},
{
name: "with some resource attributes filter",
expectedFile: "testdata/with_allow_resource_attributes_filter.txt",
options: []Option{
WithResourceAsConstantLabels(attribute.NewAllowKeysFilter("service.name")),
},
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter, err := meter.Float64Counter("foo", otelmetric.WithDescription("a simple counter"))
require.NoError(t, err)
counter.Add(ctx, 5, opt)
counter.Add(ctx, 5.9, opt)
counter.Add(ctx, 5.3, opt)
},
},
{
name: "counter utf-8",
expectedFile: "testdata/counter_utf8.txt",
enableUTF8: true,
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
opt := otelmetric.WithAttributes(
attribute.Key("A.G").String("B"),
attribute.Key("C.H").String("D"),
attribute.Key("E.I").Bool(true),
attribute.Key("F.J").Int(42),
)
counter, err := meter.Float64Counter(
"foo.things",
otelmetric.WithDescription("a simple counter"),
otelmetric.WithUnit("s"),
)
require.NoError(t, err)
counter.Add(ctx, 5, opt)
counter.Add(ctx, 10.3, opt)
counter.Add(ctx, 9, opt)
attrs2 := attribute.NewSet(
attribute.Key("A.G").String("D"),
attribute.Key("C.H").String("B"),
attribute.Key("E.I").Bool(true),
attribute.Key("F.J").Int(42),
)
counter.Add(ctx, 5, otelmetric.WithAttributeSet(attrs2))
},
},
{
name: "non-monotonic sum does not add exemplars",
expectedFile: "testdata/non_monotonic_sum_does_not_add_exemplars.txt",
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
sc := trace.NewSpanContext(trace.SpanContextConfig{
SpanID: trace.SpanID{0o1},
TraceID: trace.TraceID{0o1},
TraceFlags: trace.FlagsSampled,
})
ctx = trace.ContextWithSpanContext(ctx, sc)
opt := otelmetric.WithAttributes(
attribute.Key("A").String("B"),
attribute.Key("C").String("D"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter, err := meter.Float64UpDownCounter(
"foo",
otelmetric.WithDescription("a simple up down counter"),
otelmetric.WithUnit("s"),
)
require.NoError(t, err)
counter.Add(ctx, 5, opt)
counter.Add(ctx, 10.3, opt)
counter.Add(ctx, 9, opt)
counter.Add(ctx, -1, opt)
attrs2 := attribute.NewSet(
attribute.Key("A").String("D"),
attribute.Key("C").String("B"),
attribute.Key("E").Bool(true),
attribute.Key("F").Int(42),
)
counter.Add(ctx, 5, otelmetric.WithAttributeSet(attrs2))
},
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
if tc.enableUTF8 {
model.NameValidationScheme = model.UTF8Validation
defer func() {
// Reset to defaults
model.NameValidationScheme = model.LegacyValidation
}()
}
ctx := context.Background()
registry := prometheus.NewRegistry()
exporter, err := New(append(tc.options, WithRegisterer(registry))...)
require.NoError(t, err)
var res *resource.Resource
if tc.emptyResource {
res = resource.Empty()
} else {
res, err = resource.New(ctx,
// always specify service.name because the default depends on the running OS
resource.WithAttributes(semconv.ServiceName("prometheus_test")),
// Overwrite the semconv.TelemetrySDKVersionKey value so we don't need to update every version
resource.WithAttributes(semconv.TelemetrySDKVersion("latest")),
resource.WithAttributes(tc.customResourceAttrs...),
)
require.NoError(t, err)
res, err = resource.Merge(resource.Default(), res)
require.NoError(t, err)
}
provider := metric.NewMeterProvider(
metric.WithResource(res),
metric.WithReader(exporter),
metric.WithView(metric.NewView(
metric.Instrument{Name: "histogram_*"},
metric.Stream{Aggregation: metric.AggregationExplicitBucketHistogram{
Boundaries: []float64{0, 5, 10, 25, 50, 75, 100, 250, 500, 1000},
}},
)),
)
meter := provider.Meter(
"testmeter",
otelmetric.WithInstrumentationVersion("v0.1.0"),
otelmetric.WithInstrumentationAttributes(attribute.String("fizz", "buzz")),
)
tc.recordMetrics(ctx, meter)
file, err := os.Open(tc.expectedFile)
require.NoError(t, err)
t.Cleanup(func() { require.NoError(t, file.Close()) })
err = testutil.GatherAndCompare(registry, file)
require.NoError(t, err)
})
}
}
func TestMultiScopes(t *testing.T) {
ctx := context.Background()
registry := prometheus.NewRegistry()
exporter, err := New(WithRegisterer(registry))
require.NoError(t, err)
res, err := resource.New(ctx,
// always specify service.name because the default depends on the running OS
resource.WithAttributes(semconv.ServiceName("prometheus_test")),
// Overwrite the semconv.TelemetrySDKVersionKey value so we don't need to update every version
resource.WithAttributes(semconv.TelemetrySDKVersion("latest")),
)
require.NoError(t, err)
res, err = resource.Merge(resource.Default(), res)
require.NoError(t, err)
provider := metric.NewMeterProvider(
metric.WithReader(exporter),
metric.WithResource(res),
)
fooCounter, err := provider.Meter("meterfoo", otelmetric.WithInstrumentationVersion("v0.1.0")).
Int64Counter(
"foo",
otelmetric.WithUnit("s"),
otelmetric.WithDescription("meter foo counter"))
assert.NoError(t, err)
fooCounter.Add(ctx, 100, otelmetric.WithAttributes(attribute.String("type", "foo")))
barCounter, err := provider.Meter("meterbar", otelmetric.WithInstrumentationVersion("v0.1.0")).
Int64Counter(
"bar",
otelmetric.WithUnit("s"),
otelmetric.WithDescription("meter bar counter"))
assert.NoError(t, err)
barCounter.Add(ctx, 200, otelmetric.WithAttributes(attribute.String("type", "bar")))
file, err := os.Open("testdata/multi_scopes.txt")
require.NoError(t, err)
t.Cleanup(func() { require.NoError(t, file.Close()) })
err = testutil.GatherAndCompare(registry, file)
require.NoError(t, err)
}
func TestDuplicateMetrics(t *testing.T) {
ab := attribute.NewSet(attribute.String("A", "B"))
withAB := otelmetric.WithAttributeSet(ab)
typeBar := attribute.NewSet(attribute.String("type", "bar"))
withTypeBar := otelmetric.WithAttributeSet(typeBar)
typeFoo := attribute.NewSet(attribute.String("type", "foo"))
withTypeFoo := otelmetric.WithAttributeSet(typeFoo)
testCases := []struct {
name string
customResourceAttrs []attribute.KeyValue
recordMetrics func(ctx context.Context, meterA, meterB otelmetric.Meter)
options []Option
possibleExpectedFiles []string
}{
{
name: "no_conflict_two_counters",
recordMetrics: func(ctx context.Context, meterA, meterB otelmetric.Meter) {
fooA, err := meterA.Int64Counter("foo",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter counter foo"))
assert.NoError(t, err)
fooA.Add(ctx, 100, withAB)
fooB, err := meterB.Int64Counter("foo",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter counter foo"))
assert.NoError(t, err)
fooB.Add(ctx, 100, withAB)
},
possibleExpectedFiles: []string{"testdata/no_conflict_two_counters.txt"},
},
{
name: "no_conflict_two_updowncounters",
recordMetrics: func(ctx context.Context, meterA, meterB otelmetric.Meter) {
fooA, err := meterA.Int64UpDownCounter("foo",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter gauge foo"))
assert.NoError(t, err)
fooA.Add(ctx, 100, withAB)
fooB, err := meterB.Int64UpDownCounter("foo",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter gauge foo"))
assert.NoError(t, err)
fooB.Add(ctx, 100, withAB)
},
possibleExpectedFiles: []string{"testdata/no_conflict_two_updowncounters.txt"},
},
{
name: "no_conflict_two_histograms",
recordMetrics: func(ctx context.Context, meterA, meterB otelmetric.Meter) {
fooA, err := meterA.Int64Histogram("foo",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter histogram foo"))
assert.NoError(t, err)
fooA.Record(ctx, 100, withAB)
fooB, err := meterB.Int64Histogram("foo",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter histogram foo"))
assert.NoError(t, err)
fooB.Record(ctx, 100, withAB)
},
possibleExpectedFiles: []string{"testdata/no_conflict_two_histograms.txt"},
},
{
name: "conflict_help_two_counters",
recordMetrics: func(ctx context.Context, meterA, meterB otelmetric.Meter) {
barA, err := meterA.Int64Counter("bar",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter a bar"))
assert.NoError(t, err)
barA.Add(ctx, 100, withTypeBar)
barB, err := meterB.Int64Counter("bar",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter b bar"))
assert.NoError(t, err)
barB.Add(ctx, 100, withTypeBar)
},
possibleExpectedFiles: []string{
"testdata/conflict_help_two_counters_1.txt",
"testdata/conflict_help_two_counters_2.txt",
},
},
{
name: "conflict_help_two_updowncounters",
recordMetrics: func(ctx context.Context, meterA, meterB otelmetric.Meter) {
barA, err := meterA.Int64UpDownCounter("bar",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter a bar"))
assert.NoError(t, err)
barA.Add(ctx, 100, withTypeBar)
barB, err := meterB.Int64UpDownCounter("bar",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter b bar"))
assert.NoError(t, err)
barB.Add(ctx, 100, withTypeBar)
},
possibleExpectedFiles: []string{
"testdata/conflict_help_two_updowncounters_1.txt",
"testdata/conflict_help_two_updowncounters_2.txt",
},
},
{
name: "conflict_help_two_histograms",
recordMetrics: func(ctx context.Context, meterA, meterB otelmetric.Meter) {
barA, err := meterA.Int64Histogram("bar",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter a bar"))
assert.NoError(t, err)
barA.Record(ctx, 100, withAB)
barB, err := meterB.Int64Histogram("bar",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter b bar"))
assert.NoError(t, err)
barB.Record(ctx, 100, withAB)
},
possibleExpectedFiles: []string{
"testdata/conflict_help_two_histograms_1.txt",
"testdata/conflict_help_two_histograms_2.txt",
},
},
{
name: "conflict_unit_two_counters",
recordMetrics: func(ctx context.Context, meterA, meterB otelmetric.Meter) {
bazA, err := meterA.Int64Counter("bar",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter bar"))
assert.NoError(t, err)
bazA.Add(ctx, 100, withTypeBar)
bazB, err := meterB.Int64Counter("bar",
otelmetric.WithUnit("s"),
otelmetric.WithDescription("meter bar"))
assert.NoError(t, err)
bazB.Add(ctx, 100, withTypeBar)
},
options: []Option{WithoutUnits()},
possibleExpectedFiles: []string{"testdata/conflict_unit_two_counters.txt"},
},
{
name: "conflict_unit_two_updowncounters",
recordMetrics: func(ctx context.Context, meterA, meterB otelmetric.Meter) {
barA, err := meterA.Int64UpDownCounter("bar",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter gauge bar"))
assert.NoError(t, err)
barA.Add(ctx, 100, withTypeBar)
barB, err := meterB.Int64UpDownCounter("bar",
otelmetric.WithUnit("s"),
otelmetric.WithDescription("meter gauge bar"))
assert.NoError(t, err)
barB.Add(ctx, 100, withTypeBar)
},
options: []Option{WithoutUnits()},
possibleExpectedFiles: []string{"testdata/conflict_unit_two_updowncounters.txt"},
},
{
name: "conflict_unit_two_histograms",
recordMetrics: func(ctx context.Context, meterA, meterB otelmetric.Meter) {
barA, err := meterA.Int64Histogram("bar",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter histogram bar"))
assert.NoError(t, err)
barA.Record(ctx, 100, withAB)
barB, err := meterB.Int64Histogram("bar",
otelmetric.WithUnit("s"),
otelmetric.WithDescription("meter histogram bar"))
assert.NoError(t, err)
barB.Record(ctx, 100, withAB)
},
options: []Option{WithoutUnits()},
possibleExpectedFiles: []string{"testdata/conflict_unit_two_histograms.txt"},
},
{
name: "conflict_type_counter_and_updowncounter",
recordMetrics: func(ctx context.Context, meterA, meterB otelmetric.Meter) {
counter, err := meterA.Int64Counter("foo",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter foo"))
assert.NoError(t, err)
counter.Add(ctx, 100, withTypeFoo)
gauge, err := meterA.Int64UpDownCounter("foo_total",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter foo"))
assert.NoError(t, err)
gauge.Add(ctx, 200, withTypeFoo)
},
options: []Option{WithoutUnits()},
possibleExpectedFiles: []string{
"testdata/conflict_type_counter_and_updowncounter_1.txt",
"testdata/conflict_type_counter_and_updowncounter_2.txt",
},
},
{
name: "conflict_type_histogram_and_updowncounter",
recordMetrics: func(ctx context.Context, meterA, meterB otelmetric.Meter) {
fooA, err := meterA.Int64UpDownCounter("foo",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter gauge foo"))
assert.NoError(t, err)
fooA.Add(ctx, 100, withAB)
fooHistogramA, err := meterA.Int64Histogram("foo",
otelmetric.WithUnit("By"),
otelmetric.WithDescription("meter histogram foo"))
assert.NoError(t, err)
fooHistogramA.Record(ctx, 100, withAB)
},
possibleExpectedFiles: []string{
"testdata/conflict_type_histogram_and_updowncounter_1.txt",
"testdata/conflict_type_histogram_and_updowncounter_2.txt",
},
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
// initialize registry exporter
ctx := context.Background()
registry := prometheus.NewRegistry()
exporter, err := New(append(tc.options, WithRegisterer(registry))...)
require.NoError(t, err)
// initialize resource
res, err := resource.New(ctx,
resource.WithAttributes(semconv.ServiceName("prometheus_test")),
resource.WithAttributes(semconv.TelemetrySDKVersion("latest")),
)
require.NoError(t, err)
res, err = resource.Merge(resource.Default(), res)
require.NoError(t, err)
// initialize provider
provider := metric.NewMeterProvider(
metric.WithReader(exporter),
metric.WithResource(res),
)
// initialize two meter a, b
meterA := provider.Meter("ma", otelmetric.WithInstrumentationVersion("v0.1.0"))
meterB := provider.Meter("mb", otelmetric.WithInstrumentationVersion("v0.1.0"))
tc.recordMetrics(ctx, meterA, meterB)
match := false
for _, filename := range tc.possibleExpectedFiles {
file, ferr := os.Open(filename)
require.NoError(t, ferr)
t.Cleanup(func() { require.NoError(t, file.Close()) })
err = testutil.GatherAndCompare(registry, file)
if err == nil {
match = true
break
}
}
require.Truef(t, match, "expected export not produced: %v", err)
})
}
}
func TestCollectorConcurrentSafe(t *testing.T) {
// This tests makes sure that the implemented
// https://pkg.go.dev/github.com/prometheus/client_golang/prometheus#Collector
// is concurrent safe.
ctx := context.Background()
registry := prometheus.NewRegistry()
exporter, err := New(WithRegisterer(registry))
require.NoError(t, err)
provider := metric.NewMeterProvider(metric.WithReader(exporter))
meter := provider.Meter("testmeter")
cnt, err := meter.Int64Counter("foo")
require.NoError(t, err)
cnt.Add(ctx, 100)
var wg sync.WaitGroup
concurrencyLevel := 10
for i := 0; i < concurrencyLevel; i++ {
wg.Add(1)
go func() {
defer wg.Done()
_, err := registry.Gather() // this calls collector.Collect
assert.NoError(t, err)
}()
}
wg.Wait()
}
func TestIncompatibleMeterName(t *testing.T) {
defer func(orig otel.ErrorHandler) {
otel.SetErrorHandler(orig)
}(otel.GetErrorHandler())
errs := []error{}
eh := otel.ErrorHandlerFunc(func(e error) { errs = append(errs, e) })
otel.SetErrorHandler(eh)
// This test checks that Prometheus exporter ignores
// when it encounters incompatible meter name.
// Invalid label or metric name leads to error returned from
// createScopeInfoMetric.
invalidName := string([]byte{0xff, 0xfe, 0xfd})
ctx := context.Background()
registry := prometheus.NewRegistry()
exporter, err := New(WithRegisterer(registry))
require.NoError(t, err)
provider := metric.NewMeterProvider(
metric.WithResource(resource.Empty()),
metric.WithReader(exporter))
meter := provider.Meter(invalidName)
cnt, err := meter.Int64Counter("foo")
require.NoError(t, err)
cnt.Add(ctx, 100)
file, err := os.Open("testdata/TestIncompatibleMeterName.txt")
require.NoError(t, err)
t.Cleanup(func() { require.NoError(t, file.Close()) })
err = testutil.GatherAndCompare(registry, file)
require.NoError(t, err)
assert.Len(t, errs, 1)
// A second collect shouldn't trigger new errors
_, err = file.Seek(0, io.SeekStart)
assert.NoError(t, err)
err = testutil.GatherAndCompare(registry, file)
require.NoError(t, err)
assert.Len(t, errs, 1)
}
func TestShutdownExporter(t *testing.T) {
var handledError error
eh := otel.ErrorHandlerFunc(func(e error) { handledError = errors.Join(handledError, e) })
otel.SetErrorHandler(eh)
ctx := context.Background()
registry := prometheus.NewRegistry()
for i := 0; i < 3; i++ {
exporter, err := New(WithRegisterer(registry))
require.NoError(t, err)
provider := metric.NewMeterProvider(
metric.WithResource(resource.Default()),
metric.WithReader(exporter))
meter := provider.Meter("testmeter")
cnt, err := meter.Int64Counter("foo")
require.NoError(t, err)
cnt.Add(ctx, 100)
// verify that metrics added to a previously shutdown MeterProvider
// do not conflict with metrics added in this loop.
_, err = registry.Gather()
require.NoError(t, err)
// Shutdown should cause future prometheus Gather() calls to no longer
// include metrics from this loop's MeterProvider.
err = provider.Shutdown(ctx)
require.NoError(t, err)
}
// ensure we aren't unnecessarily logging errors from the shutdown MeterProvider
require.NoError(t, handledError)
}
func TestExemplars(t *testing.T) {
attrsOpt := otelmetric.WithAttributes(
attribute.Key("A.1").String("B"),
attribute.Key("C.2").String("D"),
attribute.Key("E.3").Bool(true),
attribute.Key("F.4").Int(42),
)
expectedNonEscapedLabels := map[string]string{
traceIDExemplarKey: "01000000000000000000000000000000",
spanIDExemplarKey: "0100000000000000",
"A.1": "B",
"C.2": "D",
"E.3": "true",
"F.4": "42",
}
expectedEscapedLabels := map[string]string{
traceIDExemplarKey: "01000000000000000000000000000000",
spanIDExemplarKey: "0100000000000000",
"A_1": "B",
"C_2": "D",
"E_3": "true",
"F_4": "42",
}
for _, tc := range []struct {
name string
recordMetrics func(ctx context.Context, meter otelmetric.Meter)
expectedExemplarValue float64
expectedLabels map[string]string
escapingScheme model.EscapingScheme
validationScheme model.ValidationScheme
}{
{
name: "escaped counter",
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
counter, err := meter.Float64Counter("foo")
require.NoError(t, err)
counter.Add(ctx, 9, attrsOpt)
},
expectedExemplarValue: 9,
expectedLabels: expectedEscapedLabels,
escapingScheme: model.UnderscoreEscaping,
validationScheme: model.LegacyValidation,
},
{
name: "escaped histogram",
recordMetrics: func(ctx context.Context, meter otelmetric.Meter) {
hist, err := meter.Int64Histogram("foo")
require.NoError(t, err)
hist.Record(ctx, 9, attrsOpt)
},
expectedExemplarValue: 9,