This PR was merged into the 4.3-dev branch.

Discussion
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[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