sentry_sdk.errors DEBUG logs are emitted without debug=True

[alex-700]

How do you use Sentry?

Self-hosted/on-premise

Version

2.25.1

Steps to Reproduce

There is simple FastAPI project.

pyproject.toml

[project]
name = "bug"
version = "0.1.0"
description = "Add your description here"
requires-python = ">=3.13"
dependencies = [
    "fastapi>=0.115.12",
    "pyyaml>=6.0.2",
    "sentry-sdk>=2.25.1",
    "uvicorn>=0.34.0",
]

main.py

import fastapi
import sentry_sdk

sentry_sdk.init()

app = fastapi.FastAPI()


@app.get("/")
def hello():
    print()

log_conf.yaml

version: 1
disable_existing_loggers: False
formatters:
  default:
    # "()": uvicorn.logging.DefaultFormatter
    format: '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
  access:
    # "()": uvicorn.logging.AccessFormatter
    format: '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
handlers:
  default:
    formatter: default
    class: logging.StreamHandler
    stream: ext://sys.stderr
  default_stdout:
    formatter: default
    class: logging.StreamHandler
    stream: ext://sys.stdout
  access:
    formatter: access
    class: logging.StreamHandler
    stream: ext://sys.stdout
loggers:
  uvicorn.error:
    level: INFO
    handlers:
      - default
    propagate: no
  uvicorn.access:
    level: INFO
    handlers:
      - access
    propagate: no
root:
  level: DEBUG
  handlers:
    - default_stdout
  propagate: no

When I run it via uvicorn, the _DebugFilter seems to be not added as filter.

Expected Result

uv run uvicorn main:app --log-config log_conf.yaml

no DEBUG logs from sentry_sdk, while I do not use SENTRY_DEBUG (or debug=True).

Actual Result

uv run uvicorn main:app --log-config log_conf.yaml

There are a lot of DEBUG logs from sentry_sdk.

[antonpirker]

Hey @alex-700 can you show me how you load your log_conf.yaml and where the sentry_sdk.init() is in relation to the setting up of logging. (my guess right now is that maybe the sdks logging config is overwritten and thus the filter does not take effect)

Or maybe the _client_init_debug ContextVar in the SDK is somehow responsible for this...

[alex-700]

Hi @antonpirker !

It can be seen from the files from the issue. The main idea is ASGI application (FastAPI from main.py in the example) is running via launcher (uvicorn in the example). The launcher is configuring logging first (which can install some logging handlers), and only after this it imports the package with the ASGI application and call the sentry_sdk.init(...) from the main.py.

But since some logging handlers was installed the condition is blocking configure_logging which includes _DebugFilter setup.