Metric expression in TargetTrackingScaling aws_autoscaling_policy

Terraform Providers AWS
1

I try to use a metric expression for my autoscaling group almost as in the example at Terraform Registry.

but I’ve got the following policy in the AWS console. which is looking not so good.

screenshot1
screenshot1791×457 18 KB

and I can’t do the same policy by the UI.

and also autoscaling doesn’t work. even when the metrics have the following values

screenshot2
screenshot21597×242 7.33 KB

is this option still supported? can you please help me to figure this out?

forgot to provide source code:

resource "aws_autoscaling_policy" "calls" {
  autoscaling_group_name = aws_autoscaling_group.asterisk.name
  name                   = "calls"
  policy_type            = "TargetTrackingScaling"

  target_tracking_configuration {
    target_value = 10
    customized_metric_specification {
      metrics {
        label = "Total calls number"
        id    = "totalcount"
        metric_stat {
          metric {
            namespace   = "my_namespace"
            metric_name = "totalcount"
            dimensions {
              name  = "Environment"
              value = local.tags["Environment"]
            }
          }
          stat = "Average"
        }
        return_data = false
      }
      metrics {
        label = "Get the group size"
        id    = "number"
        metric_stat {
          metric {
            namespace   = "AWS/AutoScaling"
            metric_name = "GroupInServiceInstances"
            dimensions {
              name  = "AutoScalingGroupName"
              value = aws_autoscaling_group.asterisk.name
            }
          }
          stat = "Average"
        }
        return_data = false
      }
      metrics {
        label       = "Calculate calls per instance"
        id          = "e1"
        expression  = "totalcount / number"
        return_data = true
      }
    }
  }
}