Incidents/2021-09-18 appserver latency
document status: final
Slow database queries resulted in php-fpm worker exhaustion.
Impact: For about 10 minutes, backends were slow or unavailable for all wikis. This affected logged-in users, most bots/API queries, and some page views from unregistered users (pages that were recently edited or otherwise expired from the CDN cache).
- Public incident task: T291311
- Similar to Incident documentation/2021-09-04 appserver latency and Incident documentation/2021-04-15 appserver latency.
- T284419 (restricted)