A lessons learned post turns a completed technical struggle, project, or experience into generalizable guidance. It records what happened, examines the decisions behind it, and helps readers avoid similar mistakes. section 11.0 section 11.4
Start capturing details immediately, then write after enough time has passed for reflection. Use notes, diagrams, arrows, and side comments to organize the experience before shaping it into a readable story. section 11.1.1 section 11.4.3
Build the post around these moves:
- Be candid about failures, wrong turns, and decisions that seemed reasonable at the time; avoid turning the post into a boast. section 11.5.1
- Give readers enough technical context to understand the situation, while preserving the informal, personal voice that makes the account memorable. section 11.4.1 section 11.6
- Use chronology, timestamps, milestones, anecdotes, or diagrams to make the lesson stick and let readers follow the reasoning. section 11.4.1 section 11.4.2
- Distill specific events into lessons that can transfer across technologies when reflection supports broader conclusions. section 11.4.3
From outage to reusable lesson
A strong outage post can explain the architecture, show a timestamped path from discovery through investigation and diagnosis to recovery, then conclude with prevention plans. A migration post can similarly explain partitioning choices, double writes, backfilling, and integrity checks before compressing the experience into lessons. These structures make the story useful beyond the original incident. section 11.3.1 section 11.3.2
Treat the pattern as a low-barrier starting point: anyone who has faced a technical problem can write one. The result may be a short note about one pitfall or a broader collection of lessons. section 11.1.3 section 11.5
