diff --git a/core/pkg/sync/kubernetes/kubernetes_sync.go b/core/pkg/sync/kubernetes/kubernetes_sync.go
index 512d6fb6d..730771854 100644
--- a/core/pkg/sync/kubernetes/kubernetes_sync.go
+++ b/core/pkg/sync/kubernetes/kubernetes_sync.go
@@ -192,11 +192,7 @@ func (k *Sync) fetch(ctx context.Context) (string, error) {
 		}
 
 		k.logger.Debug(fmt.Sprintf("resource %s served from the informer cache", k.URI))
-		b, err := json.Marshal(configuration.Spec.FlagSpec)
-		if err != nil {
-			return "", fmt.Errorf("failed to marshall FlagSpec: %s", err.Error())
-		}
-		return string(b), nil
+		return marshallFeatureFlagSpec(configuration)
 	}
 
 	// fallback to API access - this is an informer cache miss. Could happen at the startup where cache is not filled
@@ -210,11 +206,7 @@ func (k *Sync) fetch(ctx context.Context) (string, error) {
 	}
 
 	k.logger.Debug(fmt.Sprintf("resource %s served from API server", k.URI))
-	b, err := json.Marshal(ff.Spec.FlagSpec)
-	if err != nil {
-		return "", fmt.Errorf("failed to marshall FlagSpec: %s", err.Error())
-	}
-	return string(b), nil
+	return marshallFeatureFlagSpec(&ff)
 }
 
 func (k *Sync) notify(ctx context.Context, c chan<- INotify) {
@@ -358,3 +350,11 @@ func k8sClusterConfig() (*rest.Config, error) {
 
 	return clusterConfig, nil
 }
+
+func marshallFeatureFlagSpec(ff *v1beta1.FeatureFlag) (string, error) {
+	b, err := json.Marshal(ff.Spec.FlagSpec)
+	if err != nil {
+		return "", fmt.Errorf("failed to marshall FlagSpec: %s", err.Error())
+	}
+	return string(b), nil
+}
diff --git a/core/pkg/sync/kubernetes/kubernetes_sync_test.go b/core/pkg/sync/kubernetes/kubernetes_sync_test.go
index 9eb47815e..b81f44074 100644
--- a/core/pkg/sync/kubernetes/kubernetes_sync_test.go
+++ b/core/pkg/sync/kubernetes/kubernetes_sync_test.go
@@ -13,6 +13,7 @@ import (
 	"github.com/open-feature/flagd/core/pkg/logger"
 	"github.com/open-feature/flagd/core/pkg/sync"
 	"github.com/open-feature/open-feature-operator/apis/core/v1beta1"
+	"github.com/stretchr/testify/require"
 	"go.uber.org/zap/zapcore"
 	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
@@ -912,3 +913,20 @@ type MockInformer struct {
 func (m MockInformer) GetStore() cache.Store {
 	return &m.fakeStore
 }
+
+func TestMeasure(t *testing.T) {
+	res, err := marshallFeatureFlagSpec(&v1beta1.FeatureFlag{
+		Spec: v1beta1.FeatureFlagSpec{
+			FlagSpec: v1beta1.FlagSpec{
+				Flags: map[string]v1beta1.Flag{
+					"flag": {
+						DefaultVariant: "kubernetes",
+					},
+				},
+			},
+		},
+	})
+
+	require.Nil(t, err)
+	require.Equal(t, "{\"flags\":{\"flag\":{\"state\":\"\",\"variants\":null,\"defaultVariant\":\"kubernetes\"}}}", res)
+}