An ops team gets paged by many CloudWatch alarms that all stem from the same underlying incident. Which feature reduces this alarm noise?
A.More granular metric dimensions
Dimensions refine metrics — they don't deduplicate alarms.
B.Composite alarms — one alarm that triggers only when a combination of sub-alarms indicates real impact
Correct. Alarm correlation is the designed anti-noise mechanism.
C.Longer evaluation periods on every alarm
That just delays every alarm without reducing count.
D.Sending all alarms to email
Channel choice doesn't affect alarm count.
Why this answer
Composite alarms combine multiple metric alarms with AND/OR logic — a single page for a real incident rather than N symptom alarms. Longer periods reduce sensitivity but not correlated-alarm storms.
Correct answer: B · Last reviewed 2026-10-28
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