You created a CloudWatch alarm but it never enters ALARM state even when the metric crosses the threshold. What is a likely cause?

medium📝 Debug Q14 of 15

AWS - CloudWatch

AThe alarm's EvaluationPeriods is set higher than the number of metric data points

BThe alarm threshold is set too low

CThe alarm is configured to notify but not to monitor metrics

DThe SNS topic ARN configured in alarm actions is invalid

Step-by-Step Solution

Solution:

Step 1: Check EvaluationPeriods vs data points
If EvaluationPeriods is more than available metric data points, alarm cannot evaluate properly.
Step 2: Confirm impact on alarm state
Without enough data points, alarm never sees enough breaches to enter ALARM state.
Final Answer:
The alarm's EvaluationPeriods is set higher than the number of metric data points -> Option A
Quick Check:
EvaluationPeriods > data points = no alarm [OK]

Quick Trick: Ensure enough data points for EvaluationPeriods [OK]

Common Mistakes:

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