Fixes reconciling Internal Traffic Policy changes and adds test

.chloggen/fix-otel-collector-service-reconciliation.yaml

@@ -0,0 +1,16 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. operator, target allocator, github action)
+component: operator
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Fixes reconciling otel-collector service's internal traffic policy changes.
+
+# One or more tracking issues related to the change
+issues: [2061]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:

pkg/collector/reconcile/service.go

@@ -104,6 +104,7 @@ func expectedServices(ctx context.Context, params manifests.Params, expected []*
 		}
 		updated.Spec.Ports = desired.Spec.Ports
 		updated.Spec.Selector = desired.Spec.Selector
+		updated.Spec.InternalTrafficPolicy = desired.Spec.InternalTrafficPolicy
 
 		patch := client.MergeFrom(existing)
 

pkg/collector/reconcile/service_test.go

@@ -78,6 +78,22 @@ func TestExpectedServices(t *testing.T) {
 		assert.Equal(t, instanceUID, actual.OwnerReferences[0].UID)
 		assert.Equal(t, "Newest", actual.Spec.Selector["app.kubernetes.io/version"])
 	})
+	t.Run("should update service on internal traffic policy change", func(t *testing.T) {
+		serviceInstance := service("test-collector", params().Instance.Spec.Ports)
+		createObjectIfNotExists(t, "test-collector", serviceInstance)
+
+		newService := serviceWithInternalTrafficPolicy("test-collector", params().Instance.Spec.Ports, v1.ServiceInternalTrafficPolicyLocal)
+		err := expectedServices(context.Background(), params(), []*v1.Service{newService})
+		assert.NoError(t, err)
+
+		actual := v1.Service{}
+		exists, err := populateObjectIfExists(t, &actual, types.NamespacedName{Namespace: "default", Name: "test-collector"})
+
+		assert.NoError(t, err)
+		assert.True(t, exists)
+		assert.Equal(t, instanceUID, actual.OwnerReferences[0].UID)
+		assert.Equal(t, v1.ServiceInternalTrafficPolicyLocal, *actual.Spec.InternalTrafficPolicy)
+	})
 }
 
 func TestDeleteServices(t *testing.T) {