# TargetTrackingScalingPolicyProps

Properties for a concrete TargetTrackingPolicy.

Adds the scalingTarget.

Extends: TargetTrackingScalingPolicyProps
Extends: BasicTargetTrackingScalingPolicyProps
Used as props by: TargetTrackingScalingPolicy

- Source: [`aws-autoscaling/lib/target-tracking-scaling-policy.ts`](https://github.com/aws/aws-cdk/blob/v2.275.0/packages/aws-cdk-lib/aws-autoscaling/lib/target-tracking-scaling-policy.ts#L96)
- Type last changed: v2.234.0 · 8 Jan 2026

## Example

```ts
// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
import * as cdk from 'aws-cdk-lib';
import { aws_autoscaling as autoscaling } from 'aws-cdk-lib';
import { aws_cloudwatch as cloudwatch } from 'aws-cdk-lib';
import { aws_autoscaling as interfaces_autoscaling } from 'aws-cdk-lib/interfaces';

declare const autoScalingGroupRef: interfaces_autoscaling.IAutoScalingGroupRef;
declare const metric: cloudwatch.Metric;
const targetTrackingScalingPolicyProps: autoscaling.TargetTrackingScalingPolicyProps = {
  autoScalingGroup: autoScalingGroupRef,
  targetValue: 123,

  // the properties below are optional
  cooldown: cdk.Duration.minutes(30),
  customMetric: metric,
  disableScaleIn: false,
  estimatedInstanceWarmup: cdk.Duration.minutes(30),
  predefinedMetric: autoscaling.PredefinedMetric.ASG_AVERAGE_CPU_UTILIZATION,
  resourceLabel: 'resourceLabel',
};
```

## Properties

- `autoScalingGroup`: [IAutoScalingGroupRef](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_autoscaling.IAutoScalingGroupRef.html) (required)

- `cooldown`: [Duration](/cdk/api/v2/docs/aws-cdk-lib.Duration.html) — Period after a scaling completes before another scaling activity can start.

  **Default:** The default cooldown configured on the AutoScalingGroup.

- `customMetric`: [IMetric](/cdk/api/v2/docs/aws-cdk-lib.aws_cloudwatch.IMetric.html) — A custom metric for application autoscaling.

  **Default:** No custom metric.

  The metric must track utilization. Scaling out will happen if the metric is higher than
  the target value, scaling in will happen in the metric is lower than the target value.

  Exactly one of customMetric or predefinedMetric must be specified.

- `disableScaleIn`: boolean = false — Indicates whether scale in by the target tracking policy is disabled.

  If the value is true, scale in is disabled and the target tracking policy
  won't remove capacity from the autoscaling group. Otherwise, scale in is
  enabled and the target tracking policy can remove capacity from the
  group.

- `estimatedInstanceWarmup`: [Duration](/cdk/api/v2/docs/aws-cdk-lib.Duration.html) — Estimated time until a newly launched instance can send metrics to CloudWatch.

  **Default:** Same as the cooldown.

- `predefinedMetric`: [PredefinedMetric](/cdk/api/v2/docs/aws-cdk-lib.aws_autoscaling.PredefinedMetric.html) — A predefined metric for application autoscaling.

  **Default:** No predefined metric.

  The metric must track utilization. Scaling out will happen if the metric is higher than
  the target value, scaling in will happen in the metric is lower than the target value.

  Exactly one of customMetric or predefinedMetric must be specified.

- `resourceLabel`: string — The resource label associated with the predefined metric.

  **Default:** No resource label.

  Should be supplied if the predefined metric is ALBRequestCountPerTarget, and the
  format should be:

  app/<load-balancer-name>/<load-balancer-id>/targetgroup/<target-group-name>/<target-group-id>

- `targetValue`: number (required) — The target value for the metric.