The hardest bugs are not the ones that happen constantly. The hardest ones are: once every few days under unknown conditions with no obvious pattern Especially in systems that run continuously. Because by the time you notice the issue, the original state is already gone. Early on, I used to approach these bugs the wrong way. I would immediately start reading logs and trying to reproduce the issue locally. Most of the time, that went nowhere. Because these problems usually depend on: timing retries load specific data states interactions between systems Things that almost never exist in your local environment the same way. What changed for me was realizing: The goal is not “find the bug immediately.” The goal is: make the system observable enough that the bug exposes itself next time. So instead of guessing, we start adding visibility around the problem. Things like: tracking state transitions storing retry history recording execution timing correlating events across systems Not permanent debugging noise.…