Debug production without stopping the world (Swift)

Steps

1. 1Correlate user report to trace IDs through gateway → service → data layer
2. 2Capture state non-invasively: heap/profile snapshots over process restarts
3. 3Enable dynamic log levels temporarily rather than redeploying
4. 4Test hypotheses against staging replicas of prod data shape
5. 5Timebox live debugging; mitigate via rollback/flag if past window
6. 6Write postmortem linking timeline to evidence artifacts
7. 7Adopt Swift Concurrency (async/await, actors) for data-race safety
8. 8Profile Instruments templates: Time Profiler + Allocations together

Common Pitfalls

• ▲Restarting away evidence mid-diagnosis
• ▲Debugging against sanitized data missing the trigger shape

Commands

$ npx skills add aniruddhaadak80/skills --skill debug-craft-production-debugging-swift

$ npx skills add aniruddhaadak80/skills --skill debug-craft-production-debugging-swift -g

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