An application runs on Amazon EC2 instances in an Auto Scaling group behind an Application Load Balancer (ALB). The application experiences sudden, unpredictable spikes in traffic. The current step scaling policy is too slow to react, resulting in degraded performance during spikes. <br/><br/>Which Auto Scaling policy should the solutions architect implement to improve responsiveness?

Answer options:

Simple scaling policy based on CPU utilization

Target tracking scaling policy based on ALB Request Count Per Target

Scheduled scaling policy

Predictive scaling policy

How to approach this question

Identify the scaling policy that reacts best to sudden load on an ALB.

Full Answer

B.Target tracking scaling policy based on ALB Request Count Per Target✓ Correct

Target tracking scaling policies increase or decrease the current capacity of the group based on a target value for a specific metric. For applications behind an ALB, `ALBRequestCountPerTarget` is an excellent metric to scale on because it directly measures the load on each instance.

Common mistakes

Choosing scheduled scaling for unpredictable traffic.

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