volkan28 Details have been logged to the system PHP log file."
Is there anything in the storage/logs error file?
volkan28 The problem occurs after we upgrade the forum to V1. Also we temporarily deactivate the search bar via .Search {display: none} coz all cpu and memory values moving up to %90+ and we get 502. The search is probably related with quick search because we have a 10M+ database and 30K daily user and I guest every each request the whole database again and again while typing because of quick search.
Unless you're somehow automatically running searches, I doubt this is the issue. V1 included some changes to search, but those should have affected performance linearly, so major changes like this seem unlikely.
Could you share php flarum info?