[Console] Add ability to schedule alarm signals and a `ConsoleAlarmEven…

[fabpot]

Q	A
Feature PR	symfony/symfony#53533
PR author(s)	@HypeMC
Merged in	7.2

We created this issue to not forget to document this new feature. We would really appreciate if you can help us with this task. If you are not sure how to do it, please ask us and we will help you.

To fix this issue, please create a PR against the 7.2 branch in the symfony-docs repository.

Thank you! 😃

[javiereguiluz]

Reading the description of this feature in symfony/symfony#53533 I still don't understand when/how this is useful. So, we'll need help (from @HypeMC or the usual doc collaborators) to contribute some docs about this feature. Thanks!

[Jibbarth]

@javiereguiluz

Maybe a good usecase could be periodically call doctrine ping to keep connection alive.

See https://twitter.com/lyrixx/status/1575127719624544258

[stof]

note that another use case (implemented in core in Messenger) is triggering the keepalive of scheduler transports needing it (this is actually the reason why this feature was added in symfony/console.

[stof]

another idea: extending a lock ttl while the processing is still in progress.