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postmortem-template
Write this after a significant bug or incident is resolved. The goal is **systems, not scapegoats** — ask how the process let the defect through, not who typed it.
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postmortem-template.mdBlameless Postmortem Template
Write this after a significant bug or incident is resolved. The goal is **systems, not scapegoats** — ask how the process let the defect through, not who typed it.
Summary
- **Title:** _short description of the failure_
- **Date / duration:** _when it started, when it was resolved_
- **Severity / impact:** _who/what was affected, how badly (users, data, revenue)_
- **Status:** Resolved / Mitigated / Monitoring
Timeline (UTC)
| Time | Event | |---|---| | 14:01 | Deploy of `abc123` | | 14:05 | Error rate alarm fires | | 14:12 | On-call acknowledges, begins investigation | | 14:30 | Root cause identified (see below) | | 14:38 | Fix deployed, error rate normal |
Root cause
State the **confirmed** cause, distinguished from the symptom, with `file:line` and the commit that introduced it. Explain *why the bad state arose*, not just where it crashed.
> e.g. `applyDiscount` mutated the shared `cart` array (`src/cart.js:48`), so a retried request applied > the discount twice. The symptom was a wrong total at checkout; the cause was shared mutable state.
Detection
- How was it found? (alarm / customer report / log)
- How long until detection? Could a metric or test have caught it sooner?
Resolution & recovery
- What fixed it (the minimal change at the cause)?
- Any cleanup needed (data backfill, cache invalidation)?
The five whys
1. Why did the total double? → discount applied twice. 2. Why twice? → request was retried and the cart was mutated. 3. Why was it mutated? → `applyDiscount` edited the array in place. 4. Why in place? → no immutability convention in cart code. 5. Why no convention? → no lint rule / review check for shared mutation.
Action items
| Action | Owner | Type | Status | |---|---|---|---| | Add regression test for double-retry discount | | prevent | | | Make cart operations immutable | | fix-class | | | Add alarm on total-mismatch metric | | detect | |
What went well / what was lucky
_Separate good process from good fortune — luck isn't repeatable._
Read more
Blameless Postmortem Template
Write this after a significant bug or incident is resolved. The goal is **systems, not scapegoats** — ask how the process let the defect through, not who typed it.
Summary
- **Title:** _short description of the failure_
- **Date / duration:** _when it started, when it was resolved_
- **Severity / impact:** _who/what was affected, how badly (users, data, revenue)_
- **Status:** Resolved / Mitigated / Monitoring
Timeline (UTC)
| Time | Event | |---|---| | 14:01 | Deploy of `abc123` | | 14:05 | Error rate alarm fires | | 14:12 | On-call acknowledges, begins investigation | | 14:30 | Root cause identified (see below) | | 14:38 | Fix deployed, error rate normal |
Root cause
State the **confirmed** cause, distinguished from the symptom, with `file:line` and the commit that introduced it. Explain *why the bad state arose*, not just where it crashed.
> e.g. `applyDiscount` mutated the shared `cart` array (`src/cart.js:48`), so a retried request applied > the discount twice. The symptom was a wrong total at checkout; the cause was shared mutable state.
Detection
- How was it found? (alarm / customer report / log)
- How long until detection? Could a metric or test have caught it sooner?
Resolution & recovery
- What fixed it (the minimal change at the cause)?
- Any cleanup needed (data backfill, cache invalidation)?
The five whys
1. Why did the total double? → discount applied twice. 2. Why twice? → request was retried and the cart was mutated. 3. Why was it mutated? → `applyDiscount` edited the array in place. 4. Why in place? → no immutability convention in cart code. 5. Why no convention? → no lint rule / review check for shared mutation.
Action items
| Action | Owner | Type | Status | |---|---|---|---| | Add regression test for double-retry discount | | prevent | | | Make cart operations immutable | | fix-class | | | Add alarm on total-mismatch metric | | detect | |
What went well / what was lucky
_Separate good process from good fortune — luck isn't repeatable._
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@juliusbrusseeInstall AgentQuestions about postmortem-template.
- Which coding agents can use postmortem-template?
- postmortem-template installs in Claude Code and Cursor: each loads subagents from .claude/agents, so copy the file there. Flowy's auto-invocation runs in Claude Code only.