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Incidents/2021-09-18 appserver latency

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Revision as of 17:49, 8 April 2022 by imported>Krinkle (Krinkle moved page Incident documentation/2021-09-18 appserver latency to Incidents/2021-09-18 appserver latency)
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document status: in-review


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).