Loguru logs showing as error
dbx0
HOBBYOP

4 months ago

Hello,

I have a python runtime application running with Loguru for handling logs and all my INFO logs are being marked as ERROR in the deploy logs. What can I change so they get identified as INFO logs instead?

Code example:

from loguru import logger

if name == "__main__":

logger.add("logs/app.log", rotation="10 MB", retention="10 days")

logger.info("Hello world")

My dockerfile

FROM python:3.13-slim

ENV PYTHONDONTWRITEBYTECODE=1 \

PYTHONUNBUFFERED=1 \

PIP_NO_CACHE_DIR=1

WORKDIR /app

COPY requirements.txt .

RUN pip install --upgrade pip && pip install -r requirements.txt

COPY . .

CMD ["python", "run.py"]

Solved$10 Bounty

Pinned Solution

matheus-cintra
HOBBY

4 months ago

You should add this to your code:

logger.add(sys.stdout, filter=lambda record: record["level"].no < 40, level="INFO")

This configuration ensures that only log messages below level 40 (i.e., below ERROR) are sent to stdout.
Levels 40 and above (ERROR, CRITICAL) will be excluded from this handler.
It's useful when deploying on platforms where separating output streams helps keep logs clean and avoids mixing error logs with standard logs.

Source: https://github.com/Delgan/loguru/issues/422#issuecomment-813519575

2 Replies

Railway
BOT

4 months ago

Hey there! We've found the following might help you get unblocked faster:

If you find the answer from one of these, please let us know by solving the thread!


matheus-cintra
HOBBY

4 months ago

You should add this to your code:

logger.add(sys.stdout, filter=lambda record: record["level"].no < 40, level="INFO")

This configuration ensures that only log messages below level 40 (i.e., below ERROR) are sent to stdout.
Levels 40 and above (ERROR, CRITICAL) will be excluded from this handler.
It's useful when deploying on platforms where separating output streams helps keep logs clean and avoids mixing error logs with standard logs.

Source: https://github.com/Delgan/loguru/issues/422#issuecomment-813519575


Status changed to Solved brody 4 months ago


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