Bug: Handler registered with addHandler not logging extra keys added by append_keys

[leandrodamascena]

Discussed in #2261

^{Originally posted by nimish-salve May 15, 2023}
aws-lambda-powertools version: 2.15.0

I am trying logger to use 2 handlers.

1. FileHandler
2. Streamhandler

When I added extra keys via append_keys, newly registered handlers are not logging extra keys.
Sample code below:

import logging
from aws_lambda_powertools import Logger
from aws_lambda_powertools.logging.formatter import LambdaPowertoolsFormatter

file_handler = logging.FileHandler('logs.log')
_LOGGER = Logger(service="test", level=logging.INFO, logger_handler=logging.NullHandler())
#_LOGGER = Logger(service="test", level=logging.INFO, logger_handler=file_handler) # this works

def main():
    file_handler.setFormatter(LambdaPowertoolsFormatter())
    _LOGGER.addHandler(file_handler)
    _LOGGER.append_keys(test="test")
    _LOGGER.info("in main 1")

    stream_handler = logging.StreamHandler()
    stream_handler.setFormatter(LambdaPowertoolsFormatter())
    _LOGGER.addHandler(stream_handler)
    _LOGGER.info("in main 2")

if __name__ == "__main__":
    main()

Whats could be the issue?

This is reproducible even with just 1 handler. If we register the handler while creating the logger itself, it works without any issues. When we explicitly register the handler, it does not work.

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This is now released under 2.16.1 version!