aws_applicationautoscaling: Error: Only direct metrics are supported for Target Tracking. Use Step Scaling or supply a Metric object.

[mostafafarzaneh]

Describe the bug

I would like to use a MathExpression for custom metric in TargetTrackingScalingPolicy, but I got this error:

Only direct metrics are supported for Target Tracking. Use Step Scaling or supply a Metric object.

checking the code here, it only checks for metricStat not mathExpression.

Expected Behavior

Should allow to define math expression for Target Tracking.

Current Behavior

Only direct metrics are allowed

Reproduction Steps

Create Target Tracking using math expression

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.27.0

Framework Version

No response

Node.js Version

16.15.0

OS

Debian 10

Language

Python

Language Version

No response

Other information

No response