Investigation Results: Q2 Server Outage Incident
Timeline of Events
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2025-06-09 14:30 UTC
Initial alert triggered for high CPU usage on `db-prod-1`. [server-logs.txt, line 1024]
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2025-06-09 14:38 UTC
On-call engineer (Alice) acknowledges the alert. Begins investigation. [on-call-alerts.csv, row 56]
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2025-06-09 14:55 UTC
Deployment of new feature `alpha-sort-v2` completed on main application servers. [deploy-logs.txt, line 88]
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2025-06-09 15:10 UTC
Multiple cascading failures reported across all application servers. Site becomes unresponsive. [server-logs.txt, line 3512]
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2025-06-09 15:25 UTC
Decision made to roll back the `alpha-sort-v2` deployment. [dev-chat.log, line 210]
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2025-06-09 15:40 UTC
Systems stabilize and come back online after rollback is complete. [server-logs.txt, line 8092]
Fishbone Diagram (Ishikawa)
- On-call engineer was new [dev-chat.log, line 15]
- Team lead on PTO [hr-records.csv, row 112]
- No load testing in staging [deploy-logs.txt, line 45]
- Database at 90% capacity [server-logs.txt, line 998]
- Inefficient DB query in new code [code-review.log, line 554]
- Outdated server firmware
- Insufficient memory allocation
- Monitoring thresholds not updated
- Latency alerts misconfigured
- Staging env not identical to prod [dev-chat.log, line 301]
Personnel
Methods
Machines
Materials
Measurements
Environment
Q2 Server Outage