chore(applicationautoscaling): add missing PredefinedMetricType enum values (#31115)

### Issue # (if applicable)

Closes #31113

### Reason for this change

There are three `PredefinedMetricType` values missing from the enum:

* SageMakerInferenceComponentConcurrentRequestsPerCopyHighResolution
* SageMakerVariantConcurrentRequestsPerModelHighResolution
* WorkSpacesAverageUserSessionsCapacityUtilization

https://docs.aws.amazon.com/autoscaling/application/APIReference/API_PredefinedMetricSpecification.html

### Description of changes

Adds the missing enums

### Description of how you validated changes

Added unit tests

### Checklist
- [ X ] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: shahks

packages/aws-cdk-lib/aws-applicationautoscaling/lib/target-tracking-scaling-policy.ts

@@ -304,4 +304,19 @@ export enum PredefinedMetric {
    * @see https://docs.aws.amazon.com/autoscaling/application/APIReference/API_PredefinedMetricSpecification.html
    */
   ELASTICACHE_DATABASE_CAPACITY_USAGE_COUNTED_FOR_EVICT_PERCENTAGE = 'ElastiCacheDatabaseCapacityUsageCountedForEvictPercentage',
+  /**
+   * SAGEMAKER_INFERENCE_COMPONENT_CONCURRENT_REQUESTS_PER_COPY_HIGH_RESOLUTION
+   * @see https://docs.aws.amazon.com/autoscaling/application/APIReference/API_PredefinedMetricSpecification.html
+   */
+  SAGEMAKER_INFERENCE_COMPONENT_CONCURRENT_REQUESTS_PER_COPY_HIGH_RESOLUTION = 'SageMakerInferenceComponentConcurrentRequestsPerCopyHighResolution',
+  /**
+   * SAGEMAKER_VARIANT_CONCURRENT_REQUESTS_PER_MODEL_HIGH_RESOLUTION
+    * @see https://docs.aws.amazon.com/autoscaling/application/APIReference/API_PredefinedMetricSpecification.html
+    */
+  SAGEMAKER_VARIANT_CONCURRENT_REQUESTS_PER_MODEL_HIGH_RESOLUTION = 'SageMakerVariantConcurrentRequestsPerModelHighResolution',
+  /**
+   * WORKSPACES_AVERAGE_USER_SESSIONS_CAPACITY_UTILIZATION
+   * @see https://docs.aws.amazon.com/autoscaling/application/APIReference/API_PredefinedMetricSpecification.html
+   */
+  WORKSPACES_AVERAGE_USER_SESSIONS_CAPACITY_UTILIZATION = 'WorkSpacesAverageUserSessionsCapacityUtilization',
 }

packages/aws-cdk-lib/aws-applicationautoscaling/test/target-tracking.test.ts

@@ -91,6 +91,66 @@ describe('target tracking', () => {
     });
   });
 
+  test('test setup target tracking on predefined metric for SAGEMAKER_VARIANT_CONCURRENT_REQUESTS_PER_MODEL_HIGH_RESOLUTION', () => {
+    // GIVEN
+    const stack = new cdk.Stack();
+    const target = createScalableTarget(stack);
+
+    // WHEN
+    target.scaleToTrackMetric('Tracking', {
+      predefinedMetric: appscaling.PredefinedMetric.SAGEMAKER_VARIANT_CONCURRENT_REQUESTS_PER_MODEL_HIGH_RESOLUTION,
+      targetValue: 0.5,
+    });
+
+    // THEN
+    Template.fromStack(stack).hasResourceProperties('AWS::ApplicationAutoScaling::ScalingPolicy', {
+      TargetTrackingScalingPolicyConfiguration: {
+        PredefinedMetricSpecification: { PredefinedMetricType: 'SageMakerVariantConcurrentRequestsPerModelHighResolution' },
+        TargetValue: 0.5,
+      },
+    });
+  });
+
+  test('test setup target tracking on predefined metric for SAGEMAKER_INFERENCE_COMPONENT_CONCURRENT_REQUESTS_PER_COPY_HIGH_RESOLUTION', () => {
+    // GIVEN
+    const stack = new cdk.Stack();
+    const target = createScalableTarget(stack);
+
+    // WHEN
+    target.scaleToTrackMetric('Tracking', {
+      predefinedMetric: appscaling.PredefinedMetric.SAGEMAKER_INFERENCE_COMPONENT_CONCURRENT_REQUESTS_PER_COPY_HIGH_RESOLUTION,
+      targetValue: 0.5,
+    });
+
+    // THEN
+    Template.fromStack(stack).hasResourceProperties('AWS::ApplicationAutoScaling::ScalingPolicy', {
+      TargetTrackingScalingPolicyConfiguration: {
+        PredefinedMetricSpecification: { PredefinedMetricType: 'SageMakerInferenceComponentConcurrentRequestsPerCopyHighResolution' },
+        TargetValue: 0.5,
+      },
+    });
+  });
+
+  test('test setup target tracking on predefined metric for WORKSPACES_AVERAGE_USER_SESSIONS_CAPACITY_UTILIZATION', () => {
+    // GIVEN
+    const stack = new cdk.Stack();
+    const target = createScalableTarget(stack);
+
+    // WHEN
+    target.scaleToTrackMetric('Tracking', {
+      predefinedMetric: appscaling.PredefinedMetric.WORKSPACES_AVERAGE_USER_SESSIONS_CAPACITY_UTILIZATION,
+      targetValue: 0.5,
+    });
+
+    // THEN
+    Template.fromStack(stack).hasResourceProperties('AWS::ApplicationAutoScaling::ScalingPolicy', {
+      TargetTrackingScalingPolicyConfiguration: {
+        PredefinedMetricSpecification: { PredefinedMetricType: 'WorkSpacesAverageUserSessionsCapacityUtilization' },
+        TargetValue: 0.5,
+      },
+    });
+  });
+
   test('test setup target tracking on custom metric', () => {
     // GIVEN
     const stack = new cdk.Stack();