How do I connect a logger in some submodule

[kajen3]

How can I use a logger inside a function imported from another module?
Without prefect I would simple define a logger via logger=logging.getLogger(__name__) inside each submodule (f.e.foo.py).
However when I use this approach the log-messages from the bar-function are not displayed as can be seen on the screenshot below.
What would be the correct approach?

# log_flow.py
import sys

import prefect
from foo import bar
from prefect import flow, get_run_logger, task
from utilities import AN_IMPORTED_MESSAGE


@task
def log_task(name):
    logger = get_run_logger()
    logger.info("Hello %s!", name)
    logger.info("Prefect Version = %s 🚀", prefect.__version__)
    logger.debug(AN_IMPORTED_MESSAGE)


@flow()
def log_flow(name: str):
    logger = get_run_logger()
    logger.info("Hello")
    log_task(name)


if __name__ == "__main__":
    name = sys.argv[1]
    log_flow(name)

# foo.py
import logging

logger = logging.getLogger("prefect.flow_runs.foo")

def bar():
    logger.info("Info")
    logger.warning("Warning")
    a = 3 + 3
    return a

[zanieb]

Hi! Sounds like you're looking for the PREFECT_LOGGING_EXTRA_LOGGERS setting

[athrpf]

@zanieb Can you give an example how exactly this should work? I have tried the following, but it does not log anything into the eith er the command line or the UI:

# my_flow.py
import os
from prefect import task, flow
import logging

logger = logging.getLogger("foo")


@task
def log_message(message: str):
    logger.info(message)


@flow
def logged_flow():
    log_message("Hello, world!")


if __name__ == "__main__":
    os.environ["PREFECT_LOGGING_EXTRA_LOGGERS"] = "foo"
    logged_flow()

I have also tried starting this script with

PREFECT_LOGGING_EXTRA_LOGGERS=foo python my_flow.py