Feature request: Add TenantId to Logger default properties

[phipag]

Use case

With the new Lambda Tenant Isolation feature, we have access to the TenantId from the LambdaContext object.
We should add the TenantId to the default properties in the Logging utility.

https://docs.aws.amazon.com/lambda/latest/dg/tenant-isolation.html

Solution/User Experience

We need to add support for both logging backends, log4j2 and logback. The outcome should be that (without the user changing any code) the emitted JSON will contain tenant_id.

{
    "level": "Information",
    "message": "User object: Doe, John (42)",
    "timestamp": "2025-04-07 09:06:30.708",
    "service": "user-service",
    "coldStart": true,
    "name": "...",
    "user": {
        "firstName": "John",
        "lastName": "Doe",
        "age": 42
    },
    ...
    "tenantId": "cff02b3a-0e12-4be2-b3e0-758b49c4cd9b"
    ...
}

Implementation suggestion

For Log4j2:

• Update JSON layouts in https://github.com/aws-powertools/powertools-lambda-java/tree/main/powertools-logging/powertools-logging-log4j/src/main/resources
• Create a new tenant id resolver in https://github.com/aws-powertools/powertools-lambda-java/blob/main/powertools-logging/powertools-logging-log4j/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/PowertoolsResolver.java

For Logback:

• Update https://github.com/aws-powertools/powertools-lambda-java/blob/main/powertools-logging/powertools-logging-logback/src/main/java/software/amazon/lambda/powertools/logging/logback/LambdaJsonEncoder.java
• Update https://github.com/aws-powertools/powertools-lambda-java/blob/main/powertools-logging/powertools-logging-logback/src/main/java/software/amazon/lambda/powertools/logging/logback/LambdaEcsEncoder.java

Alternative solutions

Acknowledgment

• This feature request meets Powertools for AWS Lambda (Java) Tenets
• Should this be considered in other Powertools for AWS Lambda languages? i.e. Python, TypeScript, and .NET

Future readers

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