A developer is tasked with configuring an Amazon EC2 Auto Scaling group to scale dynamically in response to varying loads. This process involves setting up scaling policies that adjust the number of instances to match the demand. One common approach is using Target Tracking Scaling Policies, where specific metrics are monitored to automatically increase or decrease the number of EC2 instances to maintain desired performance levels.

Given these considerations, which of the following metrics is NOT a part of the Target Tracking Scaling Policy options?