feat: report metrics about the test pipeline queues

server/app/app.go

@@ -256,6 +256,7 @@ func (app *App) Start(opts ...appOption) error {
 		triggerRegistry,
 		tracedbFactory,
 		app.cfg,
+		meter,
 	)
 	testPipeline.Start()
 	app.registerStopFn(func() {
@@ -267,6 +268,7 @@ func (app *App) Start(opts ...appOption) error {
 		testSuiteRunRepository,
 		testPipeline,
 		subscriptionManager,
+		meter,
 	)
 
 	testSuitePipeline.Start()

server/app/test_pipeline.go

@@ -15,6 +15,7 @@ import (
 	"github.com/kubeshop/tracetest/server/subscription"
 	"github.com/kubeshop/tracetest/server/test"
 	"github.com/kubeshop/tracetest/server/tracedb"
+	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/trace"
 )
 
@@ -32,6 +33,7 @@ func buildTestPipeline(
 	triggerRegistry *trigger.Registry,
 	tracedbFactory tracedb.FactoryFunc,
 	appConfig *config.AppConfig,
+	meter metric.Meter,
 ) *executor.TestPipeline {
 	eventEmitter := executor.NewEventEmitter(treRepo, subscriptionManager)
 
@@ -116,7 +118,8 @@ func buildTestPipeline(
 		WithPollingProfileGetter(ppRepo).
 		WithTestGetter(testRepo).
 		WithRunGetter(runRepo).
-		WithInstanceID(instanceID)
+		WithInstanceID(instanceID).
+		WithMetricMeter(meter)
 
 	pgQueue := pipeline.NewPostgresQueueDriver[executor.Job](pool, pgChannelName)
 

server/app/test_suite_pipeline.go

@@ -5,18 +5,21 @@ import (
 	"github.com/kubeshop/tracetest/server/pkg/pipeline"
 	"github.com/kubeshop/tracetest/server/subscription"
 	"github.com/kubeshop/tracetest/server/testsuite"
+	"go.opentelemetry.io/otel/metric"
 )
 
 func buildTestSuitePipeline(
 	tranRepo *testsuite.Repository,
 	runRepo *testsuite.RunRepository,
 	testRunner *executor.TestPipeline,
 	subscriptionManager *subscription.Manager,
+	meter metric.Meter,
 ) *executor.TestSuitesPipeline {
 	tranRunner := executor.NewTestSuiteRunner(testRunner, runRepo, subscriptionManager)
 	queueBuilder := executor.NewQueueConfigurer().
 		WithTestSuiteGetter(tranRepo).
-		WithTestSuiteRunGetter(runRepo)
+		WithTestSuiteRunGetter(runRepo).
+		WithMetricMeter(meter)
 
 	pipeline := pipeline.New(queueBuilder,
 		pipeline.Step[executor.Job]{Processor: tranRunner, Driver: pipeline.NewInMemoryQueueDriver[executor.Job]("testSuiteRunner")},

server/executor/queue.go

@@ -17,6 +17,7 @@ import (
 	"github.com/kubeshop/tracetest/server/subscription"
 	"github.com/kubeshop/tracetest/server/test"
 	"github.com/kubeshop/tracetest/server/testsuite"
+	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/propagation"
 	"go.opentelemetry.io/otel/trace"
 )
@@ -187,6 +188,8 @@ type queueConfigurer[T any] struct {
 	pollingProfiles pollingProfileGetter
 	dataStores      dataStoreGetter
 
+	meter metric.Meter
+
 	instanceID string
 }
 
@@ -239,6 +242,11 @@ func (qb *queueConfigurer[T]) WithTestSuiteRunGetter(suiteRuns testSuiteRunGette
 	return qb
 }
 
+func (qb *queueConfigurer[T]) WithMetricMeter(meter metric.Meter) *queueConfigurer[T] {
+	qb.meter = meter
+	return qb
+}
+
 func (qb *queueConfigurer[T]) Configure(queue *pipeline.Queue[Job]) {
 	q := &Queue{
 		cancelRunHandlerFn: qb.cancelRunHandlerFn,
@@ -259,6 +267,8 @@ func (qb *queueConfigurer[T]) Configure(queue *pipeline.Queue[Job]) {
 	queue.EnqueuePreprocessorFn = q.enqueuePreprocess
 	queue.ListenPreprocessorFn = q.listenPreprocess
 
+	queue.InitializeMetrics(qb.meter)
+
 }
 
 type Queue struct {

server/executor/test_suite_runner_test.go

@@ -21,6 +21,7 @@ import (
 	"github.com/kubeshop/tracetest/server/variableset"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"go.opentelemetry.io/otel/metric/noop"
 )
 
 type fakeTestRunner struct {
@@ -163,7 +164,8 @@ func runTestSuiteRunnerTest(t *testing.T, withErrors bool, assert func(t *testin
 
 	queueBuilder := executor.NewQueueConfigurer().
 		WithTestSuiteGetter(transactionsRepo).
-		WithTestSuiteRunGetter(transactionRunRepo)
+		WithTestSuiteRunGetter(transactionRunRepo).
+		WithMetricMeter(noop.NewMeterProvider().Meter("noop"))
 
 	pipeline := pipeline.New(queueBuilder,
 		pipeline.Step[executor.Job]{Processor: runner, Driver: pipeline.NewInMemoryQueueDriver[executor.Job]("testSuiteRunner")},

server/pkg/pipeline/postgres_driver.go

@@ -203,3 +203,7 @@ func (ch *channel[T]) Enqueue(item T) {
 
 	ch.log("notified postgres")
 }
+
+func (ch *channel[T]) Name() string {
+	return ch.name
+}

server/pkg/pipeline/queue.go

@@ -4,6 +4,8 @@ import (
 	"context"
 
 	"github.com/alitto/pond"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/metric"
 )
 
 type Enqueuer[T any] interface {
@@ -22,9 +24,16 @@ type QueueDriver[T any] interface {
 	SetListener(Listener[T])
 }
 
+type namedDriver interface {
+	Name() string
+}
+
 type Queue[T any] struct {
-	driver        QueueDriver[T]
-	itemProcessor QueueItemProcessor[T]
+	name           string
+	driver         QueueDriver[T]
+	itemProcessor  QueueItemProcessor[T]
+	enqueueCounter metric.Int64Counter
+	listenCounter  metric.Int64Counter
 
 	EnqueuePreprocessorFn func(context.Context, T) T
 	ListenPreprocessorFn  func(context.Context, T) (context.Context, T)
@@ -43,11 +52,20 @@ func NewQueue[T any](driver QueueDriver[T], itemProcessor QueueItemProcessor[T])
 		workerPool:    pond.New(QueueWorkerCount, QueueWorkerBufferSize),
 	}
 
+	if namedDriver, ok := driver.(namedDriver); ok {
+		queue.name = namedDriver.Name()
+	}
+
 	queue.SetDriver(driver)
 
 	return queue
 }
 
+func (q *Queue[T]) InitializeMetrics(meter metric.Meter) {
+	q.enqueueCounter, _ = meter.Int64Counter("messaging.enqueue.count")
+	q.listenCounter, _ = meter.Int64Counter("messaging.listen.count")
+}
+
 func (q *Queue[T]) SetDriver(driver QueueDriver[T]) {
 	q.driver = driver
 	driver.SetListener(q)
@@ -67,6 +85,9 @@ func (q Queue[T]) Enqueue(ctx context.Context, item T) {
 			item = q.EnqueuePreprocessorFn(ctx, item)
 		}
 
+		q.enqueueCounter.Add(ctx, 1, metric.WithAttributes(
+			attribute.String("queue.name", q.name),
+		))
 		q.driver.Enqueue(item)
 	})
 }
@@ -86,6 +107,9 @@ func (q Queue[T]) Listen(item T) {
 	}
 
 	q.workerPool.Submit(func() {
+		q.listenCounter.Add(ctx, 1, metric.WithAttributes(
+			attribute.String("queue.name", q.name),
+		))
 		q.itemProcessor.ProcessItem(ctx, item)
 	})
 }