From 73b7e0196e9d6500059728f9f4425ac96d7d4b0b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christoph=20St=C3=A4bler?= <cstabler@redhat.com>
Date: Tue, 3 Mar 2026 17:42:34 +0100
Subject: [PATCH] Add namespace labels to source metrics

---
 pkg/adapter/apiserver/adapter.go           | 10 ++++++----
 pkg/adapter/apiserver/adapter_injection.go | 13 +++++++------
 pkg/adapter/apiserver/delegate.go          | 14 ++++++++++++--
 pkg/adapter/mtping/runner.go               |  9 +++++++++
 pkg/observability/newcontext.go            | 14 ++++++++++++++
 5 files changed, 48 insertions(+), 12 deletions(-)

diff --git a/pkg/adapter/apiserver/adapter.go b/pkg/adapter/apiserver/adapter.go
index 89e80d86ca9..9c517f6bd18 100644
--- a/pkg/adapter/apiserver/adapter.go
+++ b/pkg/adapter/apiserver/adapter.go
@@ -52,10 +52,11 @@ type apiServerAdapter struct {
 
 	config Config
 
-	discover discovery.DiscoveryInterface
-	k8s      dynamic.Interface
-	source   string // TODO: who dis?
-	name     string // TODO: who dis?
+	discover  discovery.DiscoveryInterface
+	k8s       dynamic.Interface
+	source    string // TODO: who dis?
+	name      string // TODO: who dis?
+	namespace string
 }
 
 type resourceWatchMatch struct {
@@ -199,6 +200,7 @@ func (a *apiServerAdapter) setupDelegate() cache.Store {
 		logger:              a.logger,
 		ref:                 a.config.EventMode == v1.ReferenceMode,
 		apiServerSourceName: a.name,
+		apiServerSourceNS:   a.namespace,
 		filter:              subscriptionsapi.NewAllFilter(subscriptionsapi.MaterializeFiltersList(a.logger.Desugar(), a.config.Filters)...),
 	}
 	if a.config.ResourceOwner != nil {
diff --git a/pkg/adapter/apiserver/adapter_injection.go b/pkg/adapter/apiserver/adapter_injection.go
index fde80a2be88..a3e09b7740e 100644
--- a/pkg/adapter/apiserver/adapter_injection.go
+++ b/pkg/adapter/apiserver/adapter_injection.go
@@ -67,12 +67,13 @@ func NewAdapter(ctx context.Context, processed adapter.EnvConfigAccessor, ceClie
 	}
 
 	return &apiServerAdapter{
-		discover: kubeclient.Get(ctx).Discovery(),
-		k8s:      dynamicclient.Get(ctx),
-		ce:       ceClient,
-		source:   Get(ctx),
-		name:     env.Name,
-		config:   config,
+		discover:  kubeclient.Get(ctx).Discovery(),
+		k8s:       dynamicclient.Get(ctx),
+		ce:        ceClient,
+		source:    Get(ctx),
+		name:      env.Name,
+		namespace: env.GetNamespace(),
+		config:    config,
 
 		logger: logger,
 	}
diff --git a/pkg/adapter/apiserver/delegate.go b/pkg/adapter/apiserver/delegate.go
index 3bc362261e3..e4a4ee61e42 100644
--- a/pkg/adapter/apiserver/delegate.go
+++ b/pkg/adapter/apiserver/delegate.go
@@ -22,9 +22,11 @@ import (
 	cloudevents "github.com/cloudevents/sdk-go/v2"
 	"github.com/google/uuid"
 	"go.uber.org/zap"
+	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/client-go/tools/cache"
 	"knative.dev/eventing/pkg/adapter/apiserver/events"
 	"knative.dev/eventing/pkg/eventfilter"
+	"knative.dev/eventing/pkg/observability"
 )
 
 type resourceDelegate struct {
@@ -32,9 +34,9 @@ type resourceDelegate struct {
 	source              string
 	ref                 bool
 	apiServerSourceName string
+	apiServerSourceNS   string
 	filter              eventfilter.Filter
-
-	logger *zap.SugaredLogger
+	logger              *zap.SugaredLogger
 }
 
 var _ cache.Store = (*resourceDelegate)(nil)
@@ -82,6 +84,14 @@ func (a *resourceDelegate) sendCloudEvent(ctx context.Context, event cloudevents
 	subject := event.Context.GetSubject()
 	a.logger.Debugf("sending cloudevent id: %s, source: %s, subject: %s", event.ID(), source, subject)
 
+	// Add labels to context so otelhttp picks them up for metrics
+	ctx = observability.WithLabeler(ctx)
+	ctx = observability.WithSourceLabels(ctx, types.NamespacedName{
+		Name:      a.apiServerSourceName,
+		Namespace: a.apiServerSourceNS,
+	})
+	ctx = observability.WithMinimalEventLabels(ctx, &event)
+
 	if result := a.ce.Send(ctx, event); !cloudevents.IsACK(result) {
 		a.logger.Errorw("failed to send cloudevent", zap.Error(result), zap.String("source", source),
 			zap.String("subject", subject), zap.String("id", event.ID()))
diff --git a/pkg/adapter/mtping/runner.go b/pkg/adapter/mtping/runner.go
index 7947396d0bc..a3a7a50abee 100644
--- a/pkg/adapter/mtping/runner.go
+++ b/pkg/adapter/mtping/runner.go
@@ -28,6 +28,7 @@ import (
 	"github.com/robfig/cron/v3"
 	"go.opentelemetry.io/otel/trace"
 	"go.uber.org/zap"
+	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/client-go/kubernetes"
 	typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
 	"k8s.io/client-go/tools/record"
@@ -152,6 +153,14 @@ func (a *cronJobsRunner) cronTick(ctx context.Context, client kncloudevents.Clie
 
 		a.Logger.Debugf("sending cloudevent id: %s, source: %s, target: %s", event.ID(), source, target)
 
+		// Add labels to context so otelhttp picks them up for metrics
+		ctx = observability.WithLabeler(ctx)
+		ctx = observability.WithSourceLabels(ctx, types.NamespacedName{
+			Name:      src.Name,
+			Namespace: src.Namespace,
+		})
+		ctx = observability.WithMinimalEventLabels(ctx, &event)
+
 		if result := client.Send(ctx, event); !cloudevents.IsACK(result) {
 			// Exhausted number of retries. Event is lost.
 			a.Logger.Error("failed to send cloudevent result: ", zap.Any("result", result),
diff --git a/pkg/observability/newcontext.go b/pkg/observability/newcontext.go
index 421deb694a7..9731d44ea13 100644
--- a/pkg/observability/newcontext.go
+++ b/pkg/observability/newcontext.go
@@ -168,6 +168,20 @@ func WithSinkLabels(ctx context.Context, sink types.NamespacedName, kind string)
 	return ctx
 }
 
+func WithSourceLabels(ctx context.Context, source types.NamespacedName) context.Context {
+	labeler, ok := otelhttp.LabelerFromContext(ctx)
+	if !ok {
+		ctx = otelhttp.ContextWithLabeler(ctx, labeler)
+	}
+
+	labeler.Add(
+		SourceName.With(source.Name),
+		SourceNamespace.With(source.Namespace),
+	)
+
+	return ctx
+}
+
 func WithHTTPStatusCodeLabel(ctx context.Context, statusCode int) context.Context {
 	labeler, ok := otelhttp.LabelerFromContext(ctx)
 	if !ok {