[Solved] Given this CloudWatch alarm configuration snippet:{"MetricName": "CPUUtilization", "Namespace": "AWS/EC2", "Threshold": 70, "ComparisonOperator": "GreaterThanThreshold", "EvaluationPeriods":... | AWS

AWS - CloudWatch

Given this CloudWatch alarm configuration snippet:

{"MetricName": "CPUUtilization", "Namespace": "AWS/EC2", "Threshold": 70, "ComparisonOperator": "GreaterThanThreshold", "EvaluationPeriods": 3}

What happens if CPU utilization is 75% for 2 consecutive periods and then 65% for the third period?

AThe alarm does not trigger because CPU was not above 70% for all 3 periods

BThe alarm triggers only if CPU is above 70% for 4 periods

CThe alarm triggers immediately when CPU hits 75% the first time

DThe alarm triggers because CPU was above 70% twice

Step-by-Step Solution

Solution:

Step 1: Understand EvaluationPeriods meaning
The alarm triggers only if the metric breaches the threshold for the specified number of consecutive periods (3 here).
Step 2: Analyze given CPU values
CPU was above 70% for 2 periods, then dropped below on the 3rd, so the alarm does not trigger.
Final Answer:
The alarm does not trigger because CPU was not above 70% for all 3 periods -> Option A
Quick Check:
3 periods breach needed, only 2 met [OK]

Quick Trick: Alarm needs all evaluation periods breached [OK]

Common Mistakes:

MISTAKES

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