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14 Dec 2023

Clever, surprised and gray-haired

This article is a form of a public postmortem in which we would like to share our bumpy way of revealing the cause of a mysterious performance problem. Besides unveiling part of our technical stack based on open-source solutions, we also show how some false assumptions made such a bug triage process much harder. Besides all NOT TO DOs, you can find some exciting information about performance hunting and reproducing performance issues on a small scale. As a perk, we prepared a repository where you can reproduce the problem and make yourself familiar with tools that allowed us to confirm the cause. The last part (lessons learned) is the most valuable if you prefer to learn from the mistakes of others.