[Solved] Given this CloudWatch alarm configuration snippet:{ "AlarmName": "HighCPU", "MetricName": "CPUUtilization", "Namespace": "AWS/EC2", "Threshold": 80, "ComparisonOperator":... | AWS

AWS - CloudWatch

Given this CloudWatch alarm configuration snippet:

{
  "AlarmName": "HighCPU",
  "MetricName": "CPUUtilization",
  "Namespace": "AWS/EC2",
  "Threshold": 80,
  "ComparisonOperator": "GreaterThanThreshold",
  "EvaluationPeriods": 2,
  "AlarmActions": ["arn:aws:sns:us-east-1:123456789012:NotifyMe"]
}

What happens when the CPU utilization exceeds 80% for 2 evaluation periods?

AAn SNS notification is sent to subscribers of the NotifyMe topic

BThe EC2 instance automatically scales up

CThe alarm resets without any action

DA Lambda function is triggered

Step-by-Step Solution

Solution:

Step 1: Analyze AlarmActions ARN
The AlarmActions list contains an SNS topic ARN, meaning notifications are sent on alarm.
Step 2: Understand alarm trigger
When CPUUtilization > 80% for 2 periods, alarm state changes and triggers SNS notification.
Final Answer:
An SNS notification is sent to subscribers of the NotifyMe topic -> Option A
Quick Check:
Alarm with SNS ARN sends notifications [OK]

Quick Trick: SNS ARN in AlarmActions means notification sent [OK]

Common Mistakes:

MISTAKES

Assuming Auto Scaling happens without scaling policy
Thinking alarm resets silently
Confusing SNS with Lambda triggers

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Given this CloudWatch alarm configuration snippet:

Step 1: Analyze AlarmActions ARN

Step 2: Understand alarm trigger

Final Answer:

Quick Check:

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