What is the $orphan parameter for? It isn't documented.
Using boolean flag parameters is considered to be a bad practice,
it would be better to introduce another method, e.g. seeOrphanedEventTriggered.

Ok.
Before making the changes and creating the new function, i would like to clarify something:

Using boolean flag parameters is considered to be a bad practice

To be consistent with this, do you agree to create specific functions for the following methods that already include parameter flags?:

public function persistService(string $serviceName, bool $isPermanent = false)
public function seeAuthentication(bool $remembered = false)
public function dontSeeAuthentication(bool $remembered = true)

Something like:
persistPermanentService
seeRememberedAuthentication
dontSeeRememberedAuthentication

If we know that it is a bad practice, it is something that we must correct, right?

@Naktibalda One more thing.
Should the name be seeOrphanEventTriggered or seeOrphanedEventTriggered ?

To be consistent with this, do you agree to create specific functions for the following methods that already include parameter flags?

Yes.

Should the name be seeOrphanEventTriggered or seeOrphanedEventTriggered ?

What is an orphaned event?

It is also not documented on Symfony.com but that is how it was named when it was added to the Profiler.
See symfony/symfony#24347 and symfony/symfony#24392

Basically it is an event that fires without the need for a listener. Instead, it is executed by calling the ->dispatch() method manually.

Edit: I removed the flag here as you requested.