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An EC2 fleet behind an ALB starts emitting 5xx errors. Which DOP-C02 §5.3 troubleshooting path is BEST?
ACorrelate ALB access logs, target-group health checks, EC2 instance metrics, and X-Ray traces to identify the failing tier
BDisable health checks so the 5xx errors stop being counted
CDelete the load balancer
DReboot every instance immediately
Answer & Solution
Correct answer: A. Correlate ALB access logs, target-group health checks, EC2 instance metrics, and X-Ray traces to identify the failing tier
Correlated cross-service observability is the canonical RCA path (per DOP-C02 §5.3). The other options are reckless or hide failures.
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