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Blameless Postmortem Generator
Fill in what happened. Get a complete, blameless incident report in Markdown — summary, timeline, root cause, contributing factors, and action items. Copy or download. No signup.
✓ No signup
✓ Markdown output
✓ Blameless-by-design
✓ Works offline
How to write a postmortem that actually gets read
A postmortem is only useful if the org reads it and the action items ship. Most postmortems fail at one or the other — usually because the doc is either too long to skim or too short to be useful. The framework below optimizes for both.
The five sections nobody skips
- Summary. Three or four sentences a VP could read on their phone. What broke, who was affected, how long, how it was fixed. That’s it.
- Impact. The concrete numbers — users affected, requests dropped, SLA burn, dollars, customer reports. Vague impact gets vague action items.
- Timeline. Detection, escalation, investigation, mitigation, resolution. Include the minutes-and-seconds because the difference between a 4-minute detection and a 40-minute detection is a completely different incident.
- Root cause & contributing factors. The specific technical or process failure, plus every other thing that made this incident more likely or slower to fix.
- Action items. Specific, owned, dated. If the action item can’t be turned into a Jira ticket by the end of the meeting, it’s not an action item.
The blameless framing test
Read every sentence of your postmortem and ask: would a reasonable engineer with the same information have made the same call? If yes, the sentence should describe the system that led to the decision — not the person who made it. This is not about protecting feelings. It’s about surfacing the actual fix. A team that treats every incident as a personal failure will get incidents that are hidden and workarounds that are undocumented. A team that treats every incident as a systems failure will get honest signal.
The good/great distinction
A good postmortem describes what happened. A great postmortem explains why the system was set up so this could happen — the missing monitoring, the ambiguous ownership, the untested rollback path — and ships fixes for those. Aim for the second.
Common failure modes
- The 40-page essay. Nobody reads a 40-page postmortem. Nobody. Keep it tight; link out to logs and dashboards.
- The vague action items. “Improve monitoring” is not an action item. “Add p99 latency alert on /api/checkout with 800ms threshold, owner @jane, due Feb 15” is.
- The action items nobody owns. Multi-owner action items die. Single owner or it doesn’t ship.
- The delayed doc. A postmortem written three weeks later is a fiction. Write the timeline within 48 hours while the details are sharp; do the deeper write-up within a week.
- The forgotten follow-up. Action items with no owner or no review date evaporate. Put a review meeting on the calendar 30 days after the postmortem to check what shipped and what didn’t.
Frequently asked questions
What is a blameless postmortem?+
A blameless postmortem focuses on the systems, tools, and processes that allowed an incident to happen — not on the individual who made a contributing decision. The goal is honest signal about what needs to change. Blameless doesn’t mean consequence-free; it means treating human error as a symptom of a systemic problem rather than the root cause.
What should a good postmortem include?+
At minimum: a short summary, detailed timeline, root cause and contributing factors, what went well, what didn’t, and specific action items with owners and due dates. Optional but valuable: concrete impact numbers, links to dashboards / PRs, and a follow-up review date.
How soon should the postmortem be written?+
Within 48 hours for anything customer-impacting; within a week for internal incidents. The details fade fast. Draft the timeline while it’s fresh, then hold the review within a week.
Who should own writing the postmortem?+
Usually the incident commander or the engineer who led the response. A single owner shipping the doc beats a committee. The important thing is that one person is accountable for it landing.
What makes a good action item?+
Specific, owned, and dated. Tag each item as either “prevent this class of incident,” “detect this class faster,” or “mitigate this class faster.” That split forces you to think about which layer of defense actually needs strengthening.