It is 2 AM. Your monitoring dashboard is lit up red. Users are reporting errors. The last deployment was three hours ago. Sound familiar?
Production debugging is a skill that is rarely taught but frequently needed. In this guide, I share the mental models and practical techniques I have developed over years of on-call rotations.
Step One: Do Not Panic
The first instinct is to start changing things. Resist it. Before you touch anything, gather data. Check your logs, look at your metrics, and form a hypothesis. The worst production incidents are the ones made worse by hasty fixes.
Isolate and Reproduce
Can you reproduce the issue? If yes, you are halfway to a fix. If no, you need more observability. Add structured logging, trace requests end-to-end, and build dashboards before you need them — not during an incident.