[lambda] Expose function's log group as property

[Shahab96]

Exposing the log group created by cdk for a lambda function as a property.

Use Case

When making metrics to monitor lambda memory consumption, the only way to do it currently is by using a metric filter on the cloudwatch logs. However the metric filter requires a log group object to apply the filter on and in order to get the log group object currently, we need to parse the arn of the generated log group and use that to capture the ILogGroup object which we would use to apply metric filters.

Proposed Solution

Expose the log group that cdk creates for the lambda function as a property

Proposed solution:

public logGroup: ILogGroup;
constructor(scope: Construct, id: string, props: FunctionProps) {
    ...
    this.logGroup = logs.LogGroup.fromLogGroupArn(scope, id, parsedLogGroupArn);
}

Expected result:

const func = new lambda.Function(...someArgumentsHere);
const logGroup = func.logGroup;

Other

• 👋 I may be able to implement this feature request

This is a 🚀 Feature Request

[NGL321]

Hey @Shahab96,

Thank you for commenting! This seems like a reasonable feature request. We can definitely look into it, however if you would like to see this fast, your best bet is submitting a PR yourself!

Either way, someone will comment here to let you know when there is an update!

😸

[nija-at]

Related #667 & #3838

[nija-at]

Duplicate of #3838