template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  sam-app

  Sample SAM Template for sam-app

Globals:
  Function:
    Timeout: 10

Resources:
  PetstoreFunction:
    Type: AWS::Serverless::Function
    Properties:
      PackageType: Image
      MemorySize: 2048
      Tracing: Active
      Environment:
        Variables:
          RUST_LOG: info
          READINESS_CHECK_PATH: /healthz
          REMOVE_BASE_PATH: /v1
      AutoPublishAlias: live
      DeploymentPreference:
        Type: AllAtOnce
      ProvisionedConcurrencyConfig:
        ProvisionedConcurrentExecutions: 1
      Events:
        Root:
          Type: HttpApi
          Properties:
            Path: /v1
            Method: ANY
        Petstore:
          Type: HttpApi
          Properties:
            Path: /v1/{proxy+}
            Method: ANY
    Metadata:
      DockerTag: java8.al2-maven-v1
      DockerContext: ./app
      Dockerfile: Dockerfile

  MyScalableTarget:
    Type: AWS::ApplicationAutoScaling::ScalableTarget
    Properties:
      MaxCapacity: 100
      MinCapacity: 1
      ResourceId: !Sub function:${PetstoreFunction}:live # You need to specify an alis or version here
      RoleARN: !Sub arn:aws:iam::${AWS::AccountId}:role/aws-service-role/lambda.application-autoscaling.amazonaws.com/AWSServiceRoleForApplicationAutoScaling_LambdaConcurrency
      ScalableDimension: lambda:function:ProvisionedConcurrency
      ServiceNamespace: lambda
    DependsOn: PetstoreFunctionAliaslive # This is your function logical ID + "Alias" + what you use for AutoPublishAlias

  MyTargetTrackingScalingPolicy:
    Type: AWS::ApplicationAutoScaling::ScalingPolicy
    Properties:
      PolicyName: utilization
      PolicyType: TargetTrackingScaling
      ScalingTargetId: !Ref MyScalableTarget
      TargetTrackingScalingPolicyConfiguration:
        TargetValue: 0.70 # Any value between 0 and 1 can be used here
        CustomizedMetricSpecification:
          Dimensions:
            - Name: FunctionName
              Value: !Ref PetstoreFunction
            - Name: Resource
              Value: !Sub "${PetstoreFunction}:live"
          MetricName: ProvisionedConcurrencyUtilization
          Namespace: AWS/Lambda
          Statistic: Maximum
          Unit: Count

Outputs:
  PetstoreApi:
    Description: "API Gateway endpoint URL for Prod stage for Petstore function"
    Value: !Sub "https://${ServerlessHttpApi}.execute-api.${AWS::Region}.${AWS::URLSuffix}/v1/pets"