diff --git a/pkg/adapter/v2/cloudevents.go b/pkg/adapter/v2/cloudevents.go
index 169e1fd69d2..8d9302fc729 100644
--- a/pkg/adapter/v2/cloudevents.go
+++ b/pkg/adapter/v2/cloudevents.go
@@ -29,8 +29,8 @@ import (
 	"github.com/cloudevents/sdk-go/v2/protocol/http"
 	"go.opencensus.io/plugin/ochttp"
 	"knative.dev/eventing/pkg/adapter/v2/util/crstatusevent"
+	"knative.dev/eventing/pkg/metrics/source"
 	duckv1 "knative.dev/pkg/apis/duck/v1"
-	"knative.dev/pkg/source"
 	"knative.dev/pkg/tracing/propagation/tracecontextb3"
 )
 
diff --git a/pkg/adapter/v2/cloudevents_test.go b/pkg/adapter/v2/cloudevents_test.go
index f911eb71160..e1b737bb09b 100644
--- a/pkg/adapter/v2/cloudevents_test.go
+++ b/pkg/adapter/v2/cloudevents_test.go
@@ -25,10 +25,9 @@ import (
 
 	cloudevents "github.com/cloudevents/sdk-go/v2"
 	"github.com/cloudevents/sdk-go/v2/protocol/http"
-	duckv1 "knative.dev/pkg/apis/duck/v1"
-	"knative.dev/pkg/source"
-
 	"knative.dev/eventing/pkg/adapter/v2/test"
+	"knative.dev/eventing/pkg/metrics/source"
+	duckv1 "knative.dev/pkg/apis/duck/v1"
 )
 
 type mockReporter struct {
diff --git a/pkg/adapter/v2/main.go b/pkg/adapter/v2/main.go
index 1079a6a25fb..63d777f880a 100644
--- a/pkg/adapter/v2/main.go
+++ b/pkg/adapter/v2/main.go
@@ -31,6 +31,7 @@ import (
 	"go.opencensus.io/stats/view"
 	"go.uber.org/zap"
 
+	"knative.dev/eventing/pkg/metrics/source"
 	kubeclient "knative.dev/pkg/client/injection/kube/client"
 	"knative.dev/pkg/controller"
 	"knative.dev/pkg/injection"
@@ -40,7 +41,6 @@ import (
 	"knative.dev/pkg/profiling"
 	"knative.dev/pkg/reconciler"
 	"knative.dev/pkg/signals"
-	"knative.dev/pkg/source"
 
 	"knative.dev/eventing/pkg/adapter/v2/util/crstatusevent"
 )
diff --git a/pkg/adapter/v2/main_message.go b/pkg/adapter/v2/main_message.go
index b798967b47d..2675e7a64c5 100644
--- a/pkg/adapter/v2/main_message.go
+++ b/pkg/adapter/v2/main_message.go
@@ -26,11 +26,11 @@ import (
 	"github.com/kelseyhightower/envconfig"
 	"go.opencensus.io/stats/view"
 	"go.uber.org/zap"
+	"knative.dev/eventing/pkg/metrics/source"
 	"knative.dev/pkg/logging"
 	"knative.dev/pkg/metrics"
 	"knative.dev/pkg/profiling"
 	"knative.dev/pkg/signals"
-	"knative.dev/pkg/source"
 
 	"knative.dev/eventing/pkg/kncloudevents"
 )
diff --git a/pkg/adapter/v2/main_message_test.go b/pkg/adapter/v2/main_message_test.go
index 6e547c6644d..3e93f24f128 100644
--- a/pkg/adapter/v2/main_message_test.go
+++ b/pkg/adapter/v2/main_message_test.go
@@ -22,12 +22,12 @@ import (
 	"testing"
 
 	"go.opencensus.io/stats/view"
-	_ "knative.dev/pkg/client/injection/kube/client/fake"
+	"knative.dev/eventing/pkg/kncloudevents"
+	"knative.dev/eventing/pkg/metrics/source"
 	"knative.dev/pkg/leaderelection"
 	"knative.dev/pkg/metrics"
-	"knative.dev/pkg/source"
 
-	"knative.dev/eventing/pkg/kncloudevents"
+	_ "knative.dev/pkg/client/injection/kube/client/fake"
 )
 
 type myAdapterBindings struct{}
diff --git a/pkg/metrics/metrics.go b/pkg/metrics/metrics.go
index 5148211cb06..23723883162 100644
--- a/pkg/metrics/metrics.go
+++ b/pkg/metrics/metrics.go
@@ -62,4 +62,10 @@ const (
 
 	// ContainerName is the container for which the metric is reported.
 	LabelContainerName = metricskey.ContainerName
+
+	// LabelResponseError is the label for client error. For HTTP, A non-2xx status code doesn't cause an error.
+	LabelResponseError = metricskey.LabelResponseError
+
+	// LabelResponseTimeout is the label timeout.
+	LabelResponseTimeout = metricskey.LabelResponseTimeout
 )
diff --git a/pkg/metrics/source/stats_reporter.go b/pkg/metrics/source/stats_reporter.go
new file mode 100644
index 00000000000..cc4d0fa97cc
--- /dev/null
+++ b/pkg/metrics/source/stats_reporter.go
@@ -0,0 +1,26 @@
+/*
+Copyright 2021 The Knative Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package source
+
+import "knative.dev/pkg/source"
+
+type StatsReporter = source.StatsReporter
+type ReportArgs = source.ReportArgs
+
+func NewStatsReporter() (StatsReporter, error) {
+	return source.NewStatsReporter()
+}