Symfony version(s) affected: 5.1.4

Description

For me it currently looks the DataCollector for the notifier component is not registered?

How to reproduce

$client->enableProfiler();
$client->request('POST', '/api/...');

$profile = $client->getProfile();
$profile->getCollector('notifier'); // there seems not exist any data collector for notifier component?

Possible Solution

Not sure for me it seems like the NotificationLoggerListener and NotificationDataCollector are never registered, not sure how they should be registered.