如何在SAP Spartacus裡監控使用者浏覽了某産品明細頁面的動作

源代碼：

export class AppModule {

 constructor(router: Router, events: EventService) {

   router.events

     .pipe(filter((event) => event instanceof NavigationStart))

     .subscribe(console.log);

   const result$ = events.get(CartAddEntrySuccessEvent);

   result$.subscribe((event) => console.log(event));

   const result2$ = events.get(ProductDetailsPageEvent);

     result2$.subscribe((event) => console.log('Jerry: '

      + event));

export class AppModule {

 }

}

ProductDetailsPageEvent這個事件說明：

https://sap.github.io/spartacus/classes/ProductDetailsPageEvent.html