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AWS Certified Solutions Architect - Professional · AWS
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
A. AWS Budgets with usage type — Budgets can track EC2 usage hours, but you'd need to manually calculate and update the 10% threshold above the 30-day average regularly. Budgets use a fixed budget amount — they don't dynamically adapt to changing baselines. High maintenance.
I believe B is the correct answer here as Cost Anomaly detection is the most appropriate tool to use to detect if EC2 Usage exceeds 10% of the average EC2 Usage over a month.
Why B is correct: Cost Anomaly Detection uses ML to automatically baseline your usage (including the last 30 days) and detects when daily EC2 usage exceeds ~10% above the historical average. It works perfectly across AWS Organizations from the management account. It provides daily alerts for exactly this "usage higher than average" scenario. Quick Elimination: A — AWS Budgets requires a fixed budget amount. You can't dynamically set it to "10% above the moving 30-day average" easily. C — Trusted Advisor gives cost optimization recommendations, not daily custom usage anomaly alerts. D — Amazon Detective focuses on security investigations, not cost/usage tracking.