Bug: No new Lambda Versions are deployed with Lambda configurations changes

[mriccia]

Bug: No new Lambda Versions are deployed with Lambda configurations changes

[lucashuy]

Hi, thanks for opening this issue. Unfortunately I'm not able to produce the issue following these steps:

1. Initial state

1. sam init a hello world NodeJS function
2. modify the function to look something like this:

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello-world/
      Handler: app.lambdaHandler
      Runtime: nodejs20.x
      Architectures:
        - x86_64
      Description: "foo1"
      VersionDescription: "bar1"
      AutoPublishAlias: gh7102alias

3. sam build
4. sam deploy

This deploys successfully with a Lambda version 1.

2. Adding LoggingConfig and update description

1. modify the function

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello-world/
      Handler: app.lambdaHandler
      Runtime: nodejs20.x
      Architectures:
        - x86_64
      Description: "foo2"
      VersionDescription: "bar2"
      AutoPublishAlias: gh7102alias
      LoggingConfig:
          ApplicationLogLevel: DEBUG
          LogFormat: JSON
          SystemLogLevel: DEBUG

2. sam build
3. sam deploy

I can see that the description for the original function's description is updated, along with the version's description. Additionally, a new Lambda version was published with the new logging changes to the original function.

[mriccia]

Hello @lucashuy , thanks for the prompt response.
What's triggering the new version deployment in the steps you shared is the VersionDescription.
Without VersionDescription I can consistently see the Lambda Configuration being updated, without a new version being published.
Please can you test with the following steps?

Initial state

1. sam init a hello world NodeJS function
2. modify the function to look something like this:

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello-world/
      Handler: app.lambdaHandler
      Runtime: nodejs20.x
      Architectures:
        - x86_64
      Description: "foo1"
      AutoPublishAlias: gh7102alias

3. sam build
4. sam deploy

This deploys successfully with a Lambda version 1.

Adding LoggingConfig and update description

1. modify the function

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello-world/
      Handler: app.lambdaHandler
      Runtime: nodejs20.x
      Architectures:
        - x86_64
      Description: "foo2"
      AutoPublishAlias: gh7102alias
      LoggingConfig:
          ApplicationLogLevel: DEBUG
          LogFormat: JSON
          SystemLogLevel: DEBUG

2. sam build
3. sam deploy

I can see that the description and logging configuration for the original function are updated, but there isn't a new Lambda Version published.