some_logs_stream_lambda.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  subscription-filter-failed-template

  Sample SAM Template for subscription-filter-failed-template

# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
      Timeout: 30


Resources:

  FunctionA:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello_world/build/
      Handler: app.lambda_handler
      Runtime: python3.6
  FunctionALogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: !Sub /aws/lambda/${FunctionA}
      RetentionInDays: 3

  FunctionB:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello_world/build/
      Handler: app.lambda_handler
      Runtime: python3.6
  FunctionBLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: !Sub /aws/lambda/${FunctionB}
      RetentionInDays: 3
  FunctionC:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello_world/build/
      Handler: app.lambda_handler
      Runtime: python3.6
  FunctionCLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: !Sub /aws/lambda/${FunctionC}
      RetentionInDays: 3

  LogSubscriptionFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      CodeUri: subscription_function/build/
      Handler: app.lambda_handler
      Runtime: python3.6
      Events:
        FunctionALogGroup:
          Type: CloudWatchLogs
          Properties:
            LogGroupName: !Ref FunctionALogGroup
            FilterPattern: ""
        FunctionBLogGroup:
          Type: CloudWatchLogs
          Properties:
            LogGroupName: !Ref FunctionBLogGroup
            FilterPattern: ""
        FunctionCLogGroup:
          Type: CloudWatchLogs
          Properties:
            LogGroupName: !Ref FunctionCLogGroup
            FilterPattern: ""
  LogSubscriptionFunctionLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: !Sub /aws/lambda/${LogSubscriptionFunction}
      RetentionInDays: 3