[Monolog] Disable DebugLogger in CLI

[lyrixx]

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

Considering this code:

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();
            }
        }
    }
}

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

[nicolas-grekas]

Would calling reset() periodically in your worker's main loop work? $logger->reset() or $logger->getDebugLogger()->reset()?

[lyrixx]

@nicolas-grekas This is another solution but A/ it's not buildin B/ it's useless to have this collector anyway
That's why I prefer this way of doing thing

[nicolas-grekas]

Related to #25876

[lyrixx]

@nicolas-grekas Let's merge it ?

[lyrixx]

@stof Are you OK with this one now?

[fabpot]

Thank you @lyrixx.

[Tobion]

should be marked as internal