Observed Signal · May 3, 2026 · Technical Demo · Source: DEV Community · Impact: 3/5 · Sentiment: Positive
AWS DevOps Agent Detects Three Injected Faults
A technical walkthrough demonstrates AWS DevOps Agent investigating three simultaneous, injected faults in a multi-region demo app called PayLedger. The demo deploys PayLedger across ap-southeast-1 (primary) and ap-northeast-1 (secondary) with Route 53 failover and DynamoDB Global Tables. After injecting faults (reserved concurrency set to 0 for the health Lambda, TABLE_NAME env var removed for listTransactions, and execution role changed for getBalance), Route 53 failed over traffic to the healthy region and the DevOps Agent completed its automated investigation in 7 minutes and 3 seconds. The agent used an auto-generated Agent Space Understanding skill to build architecture context, queried logs/metrics/CloudTrail in parallel, attributed 100 5xx errors (90 throttles, 5 init crashes, 5 IAM errors), identified the changes in CloudTrail within a 2-second window, and concluded no mitigation was required because the incident was intentional and self-reverted.
Demonstrates automated root-cause analysis and multi-source correlation (logs, metrics, CloudTrail) by AWS DevOps Agent in a multi-region failover scenario — relevant to observability and reliability practices for cloud-native services.
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Key Takeaways & Evidence Grounding
- Demo app PayLedger deployed in ap-southeast-1 (primary) and ap-northeast-1 (secondary) with Route 53 failover and DynamoDB Global Tables.
- Three faults were injected simultaneously: reserved concurrency=0 on the health Lambda (throttling), removal of TABLE_NAME env var causing listTransactions init crashes, and role change to payledger-dev-fault-iam causing AccessDenied on getBalance.
- Route 53 failed over traffic from ap-southeast-1 to ap-northeast-1 within ~20 seconds, preserving service availability.
- AWS DevOps Agent completed the automated investigation in 7 minutes and 3 seconds, correlating logs, metrics, and CloudTrail to attribute 100 5xx errors (90 throttles, 5 init crashes, 5 IAM errors).
- CloudTrail showed the three configuration changes occurred within a 2-second window; the faults were restored at 13:29:00 UTC by fault.py restore two minutes after injection.
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