How to provide a custom Filter for the Python logging

# server.py
import uuid
import logging
import flask
from flask import Flask

def get_request_id():
    if getattr(flask.g, 'request_id', None):
        return flask.g.request_id

    new_uuid = uuid.uuid4().hex[:10]
    flask.g.request_id = new_uuid

    return new_uuid

class RequestIdFilter(logging.Filter):
    # This is a logging filter that makes the request ID available for use in
    # the logging format. Note that we're checking if we're in a request
    # context, as we may want to log things before Flask is fully loaded.
    def filter(self, record):
        record.req_id = get_request_id() if flask.has_request_context() else ''
        return True


logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)

# The StreamHandler responsible for displaying
# logs in the console.
sh = logging.StreamHandler()
sh.addFilter(RequestIdFilter())

# Note: the "req_id" param name must be the same as in
# RequestIdFilter.filter
log_formatter = logging.Formatter(
    fmt="%(module)s: %(asctime)s - %(levelname)s - ID: %(req_id)s - %(message).1000s"
)
sh.setFormatter(log_formatter)
logger.addHandler(sh)

app = Flask(__name__)


@app.route("/")
def hello():
    logger.info("Hello world!")
    logger.info("I am a log inside the /hello endpoint")
    return "Hello World!"


if __name__ == "__main__":
    app.run()

references:

https://stackoverflow.com/questions/69363431/add-session-id-or-some-unique-id-per-session-in-python-logs