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Loguru + Sentry — Powerful Error Monitoring in Python

Written by: Marlon Colca
Posted on 05 May 2025 - 10 days ago
python logging loguru sentry

In this post, you'll learn how to connect Loguru with Sentry for full visibility over your app's issues.


Loguru gives you elegant logs.
Sentry gives you stack traces, alerts, context and error history.

Together, they make production debugging a breeze.
In this post, you’ll learn how to connect Loguru with Sentry for full visibility over your app’s issues.

⚡ Why Use Sentry?

Sentry tracks:

  • Exceptions and stack traces
  • Breadcrumbs (context before crash)
  • Tags and user info
  • Affected releases
  • Alerts in Slack, Email, etc.

🔌 Install Sentry SDK

pip install sentry-sdk

Then initialize it in your app:

import sentry_sdk

sentry_sdk.init(
    dsn="https://<your-key>@o0.ingest.sentry.io/<project-id>",
    traces_sample_rate=1.0,  # Enable performance monitoring (optional)
)

🔗 Integrate with Loguru

The key is to forward exceptions to Sentry.

Option 1: Use Loguru’s Exception Hook

from loguru import logger
import sentry_sdk

def sentry_excepthook(exc_type, exc_value, traceback):
    logger.error("Exception caught", exc_info=(exc_type, exc_value, traceback))
    sentry_sdk.capture_exception(exc_value)

logger.remove()
logger.add(sys.stderr, backtrace=True, diagnose=True)

logger.configure(
    handlers=[
        {"sink": sys.stderr, "level": "INFO"},
    ],
    exception_hook=sentry_excepthook
)

Now any uncaught exception is logged and sent to Sentry.

🚀 Option 2: Log Specific Errors to Sentry

You can manually send to Sentry in critical areas:

try:
    1 / 0
except ZeroDivisionError as e:
    logger.exception("Division error occurred")
    sentry_sdk.capture_exception(e)

🧠 Add Context with Tags

You can add user IDs, environments, etc.:

with sentry_sdk.push_scope() as scope:
    scope.set_tag("user_id", 42)
    scope.set_extra("context", {"foo": "bar"})
    sentry_sdk.capture_exception(e)

This helps you debug issues faster in Sentry UI.

🧪 FastAPI + Loguru + Sentry

from fastapi import FastAPI
from loguru import logger
import sentry_sdk

sentry_sdk.init(dsn="https://...")

app = FastAPI()

@app.get("/")
def crash():
    raise RuntimeError("Something exploded!")

With the Loguru hook, this crash is logged and visible in your Sentry dashboard with full context.

✅ Summary

  • Initialize Sentry at startup
  • Hook exceptions with Loguru
  • Add context when needed
  • Get visibility on production errors instantly

🏁 Wrapping Up the Loguru Series

Thanks for joining this mini-series on Loguru, one of Python’s most underrated logging tools.

We’ve covered:

  • ✅ Getting started with Loguru
  • ⚙️ Async logging (without blocking your app)
  • 🌐 Sending logs over the network
  • 🧠 Integrating Loguru with Sentry

Whether you’re building a CLI tool, a FastAPI app, or a distributed system — Loguru has your back with elegant, powerful logging.

Logging doesn’t have to be painful.
With the right setup, it becomes a superpower. 💥

🗣️ Let’s Keep in Touch

If you found this helpful, feel free to:

  • Share the posts with your team or on social media
  • Reach out if you have questions or ideas for future topics
  • Subscribe to the blog for more hands-on dev content (Python, tools, backends, and more)

Thanks for reading — and happy logging! 🚀