10.2 The Rollback Succeeded. Is the Incident Resolved? | Asha

An error spike follows a deployment, and a rollback request later returns success. Neither event alone explains the mechanism or establishes user recovery. Asha follows a classroom checkout defect from affected currency requests through competing hypotheses, direct Java reproduction and a carefully scoped repair. No prior lesson is required. Learn to preserve exact versions and redacted evidence, distinguish mitigation from permanent repair, reconcile uncertain remote actions, recheck the affected request category and preserve unresolved health conditions. The final handoff separates facts, hypotheses, receipts and the next observation. CHAPTERS 00:00 A successful receipt is not user recovery 00:10 The checkout failure and competing mechanisms 00:40 Define the investigation and its limits 01:00 Describe impact before assigning cause 01:21 Preserve the exact candidate 01:41 Build a timeline without assuming causation 02:01 Compare competing hypotheses 02:21 Reproduce the validator failure locally 02:42 Keep the causal claim scoped 03:02 Repair and verify the stated contract 03:22 Separate mitigation from permanent repair 03:42 Inspect state before restarting 04:03 Reconcile an uncertain action outcome 04:23 Check affected requests after mitigation 04:43 Interpret recovery rates with denominators 05:03 A passing metric is not full recovery 05:24 Use agents to organize competing evidence 05:44 Current rollout tooling and its authority 06:04 Prepare an incident handoff 06:24 Quiz: what observation is still missing? 06:45 Turn the incident into a learning artifact EXAMPLE SCOPE The Java validator was compiled for runtime 11 and executed locally: six corrected contract cases passed and the prior USD rejection was reproduced. Five arithmetic and decision checks passed. The canary and recovery traffic counts, sample minimum and error threshold are invented teaching fixtures, not production measurements or universal release criteria. No deployment or rollback was performed. The currency list is a product allowlist, not a catalog of world currencies. LESSON AND PRIMARY REFERENCES https://storage.googleapis.com/intera... https://sre.google/workbook/canarying... https://sre.google/sre-book/managing-... https://cursor.com/changelog/rollouts... Lesson and current vendor references checked October 17, 2026. Asha and the cinematic insert are AI-generated; exact teaching diagrams and code are separately rendered and checked. Demonstration only — verify with the source. #AINativeEngineering #AICodingAgents #SoftwareEngineering