sentry-python-sdk

Sentry Python SDK

Opinionated wizard that scans your Python project and guides you through complete Sentry setup.

Invoke This Skill When

• User asks to "add Sentry to Python" or "setup Sentry" in a Python app
• User wants error monitoring, tracing, profiling, logging, metrics, or crons in Python
• User mentions sentry-sdk, sentry_sdk, or Sentry + any Python framework
• User wants to monitor Django views, Flask routes, FastAPI endpoints, Celery tasks, or scheduled jobs

Note: SDK versions and APIs below reflect Sentry docs at time of writing (sentry-sdk 2.x). Always verify against docs.sentry.io/platforms/python/ before implementing.

---

Phase 1: Detect

Run these commands to understand the project before making recommendations:

# Check existing Sentry
grep -i sentry requirements.txt pyproject.toml setup.cfg setup.py 2>/dev/null

# Detect web framework
grep -rE "django|flask|fastapi|starlette|aiohttp|tornado|quart|falcon|sanic|bottle" \
  requirements.txt pyproject.toml 2>/dev/null

# Detect task queues
grep -rE "celery|rq|huey|arq|dramatiq" requirements.txt pyproject.toml 2>/dev/null

# Detect logging libraries
grep -E "loguru" requirements.txt pyproject.toml 2>/dev/null

# Detect AI libraries
grep -rE "openai|anthropic|langchain|huggingface|google-genai|pydantic-ai|litellm" \
  requirements.txt pyproject.toml 2>/dev/null

# Detect schedulers / crons
grep -rE "celery|apscheduler|schedule|crontab" requirements.txt pyproject.toml 2>/dev/null

# Check for companion frontend
ls frontend/ web/ client/ ui/ static/ templates/ 2>/dev/null

What to note:

• Is sentry-sdk already in requirements? If yes, check if sentry_sdk.init() is present — may just need feature config.
• Which framework? (Determines where to place sentry_sdk.init().)
• Which task queue? (Celery needs dual-process init; RQ needs a settings file.)
• AI libraries? (OpenAI, Anthropic, LangChain are auto-instrumented.)
• Companion frontend? (Triggers Phase 4 cross-link.)

---

Phase 2: Recommend

Based on what you found, present a concrete proposal. Don't ask open-ended questions — lead with a recommendation:

Always recommended (core coverage):

• ✅ Error Monitoring — captures unhandled exceptions, supports ExceptionGroup (Python 3.11+)
• ✅ Logging — Python logging stdlib auto-captured; enhanced if Loguru detected

Recommend when detected:

• ✅ Tracing — HTTP framework detected (Django/Flask/FastAPI/etc.)
• ✅ AI Monitoring — OpenAI/Anthropic/LangChain/etc. detected (auto-instrumented, zero config)
• ⚡ Profiling — production apps where performance matters
• ⚡ Crons — Celery Beat, APScheduler, or cron patterns detected
• ⚡ Metrics — business KPIs, SLO tracking

Recommendation matrix:

Feature	Recommend when...	Reference
Error Monitoring	Always — non-negotiable baseline	${SKILL_ROOT}/references/error-monitoring.md
Tracing	Django/Flask/FastAPI/AIOHTTP/etc. detected	${SKILL_ROOT}/references/tracing.md
Profiling	Production + performance-sensitive workload	${SKILL_ROOT}/references/profiling.md
Logging	Always (stdlib); enhanced for Loguru	${SKILL_ROOT}/references/logging.md
Metrics	Business events or SLO tracking needed	${SKILL_ROOT}/references/metrics.md
Crons	Celery Beat, APScheduler, or cron patterns	${SKILL_ROOT}/references/crons.md
AI Monitoring	OpenAI/Anthropic/LangChain/etc. detected	${SKILL_ROOT}/references/ai-monitoring.md

Propose: "I recommend Error Monitoring + Tracing [+ Logging if applicable]. Want Profiling, Crons, or AI Monitoring too?"

---

Phase 3: Guide

Install

# Core SDK (always required)
pip install sentry-sdk

# Optional extras (install only what matches detected framework):
pip install "sentry-sdk[django]"
pip install "sentry-sdk[flask]"
pip install "sentry-sdk[fastapi]"
pip install "sentry-sdk[celery]"
pip install "sentry-sdk[aiohttp]"
pip install "sentry-sdk[tornado]"

# Multiple extras:
pip install "sentry-sdk[django,celery]"

Extras are optional — plain sentry-sdk works for all frameworks. Extras install complementary packages.

Quick Start — Recommended Init

Full init enabling the most features with sensible defaults. Place before any app/framework code:

import sentry_sdk

sentry_sdk.init(
    dsn=os.environ["SENTRY_DSN"],
    environment=os.environ.get("SENTRY_ENVIRONMENT", "production"),
    release=os.environ.get("SENTRY_RELEASE"),   # e.g. "[email protected]"
    send_default_pii=True,

    # Tracing (lower to 0.1–0.2 in high-traffic production)
    traces_sample_rate=1.0,

    # Profiling — continuous, tied to active spans
    profile_session_sample_rate=1.0,
    profile_lifecycle="trace",

    # Structured logs (SDK ≥ 2.35.0)
    enable_logs=True,
)

Where to Initialize Per Framework

Framework	Where to call sentry_sdk.init()	Notes
Django	Top of settings.py, before any imports	No middleware needed — Sentry patches Django internally
Flask	Before app = Flask(__name__)	Must precede app creation
FastAPI	Before app = FastAPI()	StarletteIntegration + FastApiIntegration auto-enabled together
Starlette	Before app = Starlette(...)	Same auto-integration as FastAPI
AIOHTTP	Module level, before web.Application()
Tornado	Module level, before app setup	No integration class needed
Quart	Before app = Quart(__name__)
Falcon	Module level, before app = falcon.App()
Sanic	Inside @app.listener("before_server_start")	Sanic's lifecycle requires async init
Celery	@signals.celeryd_init.connect in worker AND in calling process	Dual-process init required
RQ	mysettings.py loaded by worker via rq worker -c mysettings
ARQ	Both worker module and enqueuing process

Django example (settings.py):

import sentry_sdk

sentry_sdk.init(
    dsn=os.environ["SENTRY_DSN"],
    send_default_pii=True,
    traces_sample_rate=1.0,
    profile_session_sample_rate=1.0,
    profile_lifecycle="trace",
    enable_logs=True,
)

# rest of Django settings...
INSTALLED_APPS = [...]

FastAPI example (main.py):

import sentry_sdk

sentry_sdk.init(
    dsn=os.environ["SENTRY_DSN"],
    send_default_pii=True,
    traces_sample_rate=1.0,
    profile_session_sample_rate=1.0,
    profile_lifecycle="trace",
    enable_logs=True,
)

from fastapi import FastAPI
app = FastAPI()

Auto-Enabled vs Explicit Integrations

Most integrations activate automatically when their package is installed — no integrations=[...] needed:

Auto-enabled	Explicit required
Django, Flask, FastAPI, Starlette, AIOHTTP, Tornado, Quart, Falcon, Sanic, Bottle	DramatiqIntegration
Celery, RQ, Huey, ARQ	GRPCIntegration
SQLAlchemy, Redis, asyncpg, pymongo	StrawberryIntegration
Requests, HTTPX, aiohttp-client	AsyncioIntegration
OpenAI, Anthropic, LangChain, Pydantic AI, MCP	OpenTelemetryIntegration
Python logging, Loguru	WSGIIntegration / ASGIIntegration

For Each Agreed Feature

Walk through features one at a time. Load the reference, follow its steps, verify before moving on:

Feature	Reference file	Load when...
Error Monitoring	${SKILL_ROOT}/references/error-monitoring.md	Always (baseline)
Tracing	${SKILL_ROOT}/references/tracing.md	HTTP handlers / distributed tracing
Profiling	${SKILL_ROOT}/references/profiling.md	Performance-sensitive production
Logging	${SKILL_ROOT}/references/logging.md	Always; enhanced for Loguru
Metrics	${SKILL_ROOT}/references/metrics.md	Business KPIs / SLO tracking
Crons	${SKILL_ROOT}/references/crons.md	Scheduler / cron patterns detected
AI Monitoring	${SKILL_ROOT}/references/ai-monitoring.md	AI library detected

For each feature: Read ${SKILL_ROOT}/references/<feature>.md, follow steps exactly, verify it works.

---

Configuration Reference

Key sentry_sdk.init() Options

Option	Type	Default	Purpose
dsn	str	None	SDK disabled if empty; env: SENTRY_DSN
environment	str	"production"	e.g., "staging"; env: SENTRY_ENVIRONMENT
release	str	None	e.g., "[email protected]"; env: SENTRY_RELEASE
send_default_pii	bool	False	Include IP, headers, cookies, auth user
traces_sample_rate	float	None	Transaction sample rate; None disables tracing
traces_sampler	Callable	None	Custom per-transaction sampling (overrides rate)
profile_session_sample_rate	float	None	Continuous profiling session rate
profile_lifecycle	str	"manual"	"trace" = auto-start profiler with spans
profiles_sample_rate	float	None	Transaction-based profiling rate
enable_logs	bool	False	Send logs to Sentry (SDK ≥ 2.35.0)
sample_rate	float	1.0	Error event sample rate
attach_stacktrace	bool	False	Stack traces on capture_message()
max_breadcrumbs	int	100	Max breadcrumbs per event
debug	bool	False	Verbose SDK debug output
before_send	Callable	None	Hook to mutate/drop error events
before_send_transaction	Callable	None	Hook to mutate/drop transaction events
ignore_errors	list	[]	Exception types or regex patterns to suppress
auto_enabling_integrations	bool	True	Set False to disable all auto-detection

Environment Variables

Variable	Maps to	Notes
SENTRY_DSN	dsn
SENTRY_RELEASE	release	Also auto-detected from git SHA, Heroku, CircleCI, CodeBuild, GAE
SENTRY_ENVIRONMENT	environment
SENTRY_DEBUG	debug

---

Verification

Test that Sentry is receiving events:

# Trigger a real error event — check dashboard within seconds
division_by_zero = 1 / 0

Or for a non-crashing check:

sentry_sdk.capture_message("Sentry Python SDK test")

If nothing appears:

1. Set debug=True in sentry_sdk.init() — prints SDK internals to stdout
2. Verify the DSN is correct
3. Check SENTRY_DSN env var is set in the running process
4. For Celery/RQ: ensure init runs in the worker process, not just the calling process

---

Phase 4: Cross-Link

After completing Python setup, check for a companion frontend missing Sentry:

ls frontend/ web/ client/ ui/ 2>/dev/null
cat frontend/package.json web/package.json client/package.json 2>/dev/null \
  | grep -E '"react"|"svelte"|"vue"|"next"|"nuxt"'

If a frontend exists without Sentry, suggest the matching skill:

Frontend detected	Suggest skill
React / Next.js	sentry-react-sdk
Svelte / SvelteKit	sentry-svelte-sdk
Vue / Nuxt	Use @sentry/vue — see docs.sentry.io/platforms/javascript/guides/vue/
Other JS/TS	sentry-react-sdk (covers generic browser JS patterns)

---

Troubleshooting

Issue	Solution
Events not appearing	Set debug=True, verify DSN, check env vars in the running process
Malformed DSN error	Format: https://<key>@o<org>.ingest.sentry.io/<project>
Django exceptions not captured	Ensure sentry_sdk.init() is at the top of settings.py before other imports
Flask exceptions not captured	Init must happen before app = Flask(__name__)
FastAPI exceptions not captured	Init before app = FastAPI(); both StarletteIntegration and FastApiIntegration auto-enabled
Celery task errors not captured	Must call sentry_sdk.init() in the worker process via celeryd_init signal
Sanic init not working	Init must be inside @app.listener("before_server_start"), not module level
uWSGI not capturing	Add --enable-threads --py-call-uwsgi-fork-hooks to uWSGI command
No traces appearing	Verify traces_sample_rate is set (not None); check that the integration is auto-enabled
Profiling not starting	Requires traces_sample_rate > 0 + either profile_session_sample_rate or profiles_sample_rate
enable_logs not working	Requires SDK ≥ 2.35.0; for direct structured logs use sentry_sdk.logger; for stdlib bridging use LoggingIntegration(sentry_logs_level=...)
Too many transactions	Lower traces_sample_rate or use traces_sampler to drop health checks
Cross-request data leaking	Don't use get_global_scope() for per-request data — use get_isolation_scope()
RQ worker not reporting	Pass --sentry-dsn="" to disable RQ's own Sentry shortcut; init via settings file instead