AWS Certified SysOps Administrator – Associate (legacy) — Question 281

A user has setup an EBS backed instance and a CloudWatch alarm when the CPU utilization is more than 65%. The user has setup the alarm to watch it for 5 periods of 5 minutes each. The CPU utilization is 60% between 9 AM to 6 PM. The user has stopped the EC2 instance for 15 minutes between 11 AM to 11:15
AM. What will be the status of the alarm at 11:30 AM?

Answer options

• A. Alarm
• B. OK
• C. Insufficient Data
• D. Error

Correct answer: B

Explanation

When the EC2 instance is stopped between 11:00 AM and 11:15 AM, it does not send any metric data to CloudWatch. However, after the instance is restarted, it continues to report a CPU utilization of 60%, which is below the 65% threshold. By 11:30 AM, the newly received data points along with the historical data points from before 11:00 AM confirm that the metric has not breached the threshold, keeping the alarm in the OK state.