[Python] Duplicated log entries in Google App Engine (Python 3)

I'm struggling to find out why my log entries are being duplicated in Cloud Logging. I use a custom dummy handler that does nothing, and I'm also using a named logger.

Here's my code:

import google.cloud.logging
import logging


class MyLogHandler(logging.StreamHandler):
def emit(self, record):
pass

# Setting Up App Engine's Logging
client = google.cloud.logging.Client()
client.get_default_handler()
client.setup_logging()

# Setting Up my custom logger/handler
my_handler = MyLogHandler()
logging.getLogger('my_logger').addHandler(my_handler)
logging.getLogger('my_logger').setLevel(logging.DEBUG)

logging.getLogger('my_logger').debug('Why this message is being duplicated?') # please note that i'm logging into 'my_logger' logger, I'm not using root logger for this message


In the first place, I think this message shouldn't even show in Cloud Logging because i'm using a named logger called 'my_logger' and cloud logging is attached to root logger only, but anyway...

The above code is imported into my app.py which bootstraps a Flask app on app engine.

Here is a screenshot of the issue:



This guy has a similar issue: Duplicate log entries with Google Cloud Stackdriver logging of Python code on Kubernetes Engine

But I tried every workaround suggested in that topic and didn't work either. Is there something I'm missing here? Thanks in advance.

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