This PR was merged into the 4.3-dev branch.

Discussion
----------

[Monolog] Disable DebugLogger in CLI

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   |
| Fixed tickets | #30333 symfony/monolog-bundle#165 #25876
| License       | MIT
| Doc PR        |

<details>
<summary>Considering this code:</summary>

```php
namespace App\Command;

use Psr\Log\LoggerInterface;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class LeakCommand extends Command
{
    protected static $defaultName = 'leak';

    private $logger;

    public function __construct(LoggerInterface $logger)
    {
        $this->logger = $logger;

        parent::__construct();
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $reportedAt = time();
        while (true) {
            $this->logger->info('Hello');

            if (time() - $reportedAt >= 1) {
                $output->writeln(sprintf('%dMb', memory_get_usage() / 1024 / 1024));
                $reportedAt = time();
            }
        }
    }
}
```

</details>

Without the patch
```
>…/dev/labs/symfony/website-skeleton(monolog %) bin/console leak
7Mb
28Mb
51Mb
76Mb
97Mb
````

With the patch
```
>…/dev/labs/symfony/website-skeleton(monolog %) bin/console leak
6Mb
6Mb
6Mb
6Mb
```

Commits
-------

17533da [Monolog] Disable DebugLogger in CLI

…atcher' service (lyrixx)

This PR was submitted for the 4.4 branch but it was merged into the 3.4 branch instead (closes #32421).

Discussion
----------

[EventDispatcher] Add tag kernel.rest on 'debug.event_dispatcher' service

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? |
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

In CLI, Symfony leaks because it uses the TraceableEventDispatcher.
Let's make this service resetable.

This PR is related to #32418

---

Side note: Forcing user to use the `ServicesResetter` is IMHO bad for
the DX. I prefer to have something that does not leak by default.
More over, the TraceableEventDispatcher stores some informations for the
profiler. But in CLI it does not make sens, since the tooling does not
exist. I have already fixed such issue for monolog in #30339. I think we
should do the same for the TraceableEventDispatcher.

---

Note: When using #32418 + this PR and with the following code, it does not leak **at all**

<details>
<summary>code</summary>

```php
<?php

namespace App\Command;

use Psr\Log\LoggerInterface;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Style\SymfonyStyle;
use Symfony\Component\EventDispatcher\Event;
use Symfony\Component\HttpKernel\DependencyInjection\ServicesResetter;
use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;

class LeakCommand extends Command
{
    protected static $defaultName = 'leak';

    private $dispatcher;
    private $resetter;
    private $logger;

    public function __construct(EventDispatcherInterface $dispatcher, ServicesResetter $resetter, LoggerInterface $logger)
    {
        $this->dispatcher = $dispatcher;
        $this->resetter = $resetter;
        $this->logger = $logger;

        parent::__construct();
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $this->dispatcher->addListener(MyEvent::class, function ($e) {

        });
        for ($i=0; $i < INF; $i++) {
            $output->writeln(memory_get_usage());

            $this->dispatcher->dispatch(new MyEvent());
            $this->logger->debug('some log');

            // if ($i > 2000) {
            //     meminfo_dump(fopen('/tmp/my_dump_file.json', 'w'));
            //     die;
            // }

            usleep(100);
            $this->resetter->reset();
        }
    }
}

class MyEvent {}

```
</detail>

Commits
-------

5249eaf [EventDispatcher] Add tag kernel.rest on 'debug.event_dispatcher' service