(cdk cli): cdk watch with custom log groups do not stream logs to the terminal

[onhate]

Describe the bug

After the release of Advanced Logging Controls for Lambda (see https://aws.amazon.com/blogs/compute/introducing-advanced-logging-controls-for-aws-lambda-functions/) I've decided to move all the logs of my multi-stack deployment to a single unified Log Group per deployed tenant.

It goes likes this:

• The main stack creates the LogGroup like /aws/lambda/{tenant};
• The secondary stacks refers to the LogGroup using LogGroup.fromLogGroupArn(...);

Then I discovered that running cdk watch on the main stack I can see the cloudwatch logs on my terminal while on the secondary stacks it does not;

I found at that the cloudwatch log group resolver for the logs basically just assumes the log group is /aws/lambda/{physicalId}

https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk/lib/api/logs/find-cloudwatch-logs.ts#L114

Expected Behavior

I expect the logs to the displayed on terminal for lambda functions using pre-existing CloudWatch Log Groups not created in the stack (referred by LogGroup.fromLogGroupArn)

Current Behavior

I don't see the logs.

Reproduction Steps

Create a stack that creates a log group;

new LogGroup(this, 'tenant-log-group', {
        logGroupName: `/aws/lambda/xxx`
});

On a secondary stack create a Lambda Function that uses the logGroup referred by LogGroup.fromLogGroupArn instead of creating the log group in the stack itself;

Possible Solution

Check the LoggingConfig.LogGroupName property of the lambda to resolve the CloudWatch Log Group of the Lambda

Additional Information/Context

No response

CDK CLI Version

2.131.0 (build 92b912d)

Framework Version

No response

Node.js Version

20

OS

MacOS

Language

TypeScript

Language Version

No response

Other information

No response

[pahud]

Thank you for the pull request.

[github-actions]

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