4.6Post-Incident Testing

Regression Verification

After an incident fix is deployed, regression testing is critical. The fix might solve the immediate issue but introduce new problems.

Regression testing strategy post-incident:

1. Smoke test the fix itself (does the reported issue still happen?)
2. Test adjacent functionality (what could the fix have affected?)
3. Run the full automated regression suite
4. Perform targeted exploratory testing around the affected area
5. Monitor production metrics for 24-48 hours after the fix

Monitoring Setup

Every incident should result in better monitoring. Work with DevOps to ensure that:

• The specific failure mode that caused this incident has an alert
• Related failure modes have alerts
• Dashboards show the relevant metrics (connection pool usage, query latency, error rates)
• Alert thresholds are set low enough to catch the issue before it becomes customer-facing