AWS Certified SysOps Administrator – Associate (legacy) — Question 2

A SysOps Administrator has implemented an Auto Scaling group with a step scaling policy. The
Administrator notices that the additional instances have not been included in the aggregated metrics.
Why are the additional instances missing from the aggregated metrics?

Answer options

• A. The warm-up period has not expired
• B. The instances are still in the boot process
• C. The instances have not been attached to the Auto Scaling group
• D. The instances are included in a different set of metrics

Correct answer: C

Explanation

The correct answer is C because if the instances are not attached to the Auto Scaling group, they won't contribute to the group's aggregated metrics. Option A is incorrect as the warm-up period only delays metrics reporting but doesn't exclude instances. Option B is not valid since instances in the boot process should still be counted once they are attached. Option D is incorrect because all instances in the same Auto Scaling group should share the same set of metrics.