I suspect some spam to a Drupal/Wordpress/phpBB instance.
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Restarted php-fpm in the afternoon.
I've also deployed 502, 503, 504 pages @ https://github.com/espace-win/outage/ so we can have a clean 504 Gateway timeout in such case.
Logs have been silenced for favicon.ico or robots.txt, so we can follow them and try to see with a tail -f how that occurs.
Watching.