keep lambda function warm in sam template

warmLambdaSam.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Resources:
  WarmFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: ./src
      Handler: index.handler
      Runtime: python3.8
      Events:
        WarmUpEvent:
          Type: Schedule
          Properties:
            Schedule: rate(5 minutes)
            Enabled: true
            Input: '{"query":"warm"}'
      Environment:
        Variables:
          LOG_LEVEL: INFO

Outputs:
  WarmFunctionName:
    Description: The name of the warm function
    Value: !Ref WarmFunction
    Export:
      Name: WarmFunctionName