Re: [w3c/push-api] How to compute number of views for the push notifications sent? (Issue #386)

Hello!
@collimarco, I believe @myupchar is talking about tracking, not requesting content for the notification. In that case, calling analytics API inside `push` event is valid idea.

I'd improve @nerdysherpas code a bit to leverage `waitUntil` method to have better chance that the browser will not unload service worker earlier than needed

Example similar to the one from my "[Web Push Notifications Done Right](https://www.slideshare.net/slideshow/web-push-notifications-done-right/257599974)" session:

```
self.addEventListener('push', (event) => {
      notification = event.data.json();
      const analyticsPromise = ... // calling Analytics API
      const showNotificationPromise = self.registration.showNotification(
        notificationData.title,
        notificationData
      );
      const promiseChain = Promise.allSettled([
        analyticsPromise,
        showNotificationPromise,
      ]);
      event.waitUntil(promiseChain);
    });
```

@myupchar you can also get extra insights about interactions with your notifications by calling analytics API inside `notificationclick` and `notificationclose` events also available in the service worker.

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