Celery Missing Documentation: celery.Celery.worker

The Fix

pip install celery==5.1.2

Based on closed celery/celery issue #6730 · PR/commit linked

Production note: This usually shows up under retries/timeouts. Treat it as a side-effect risk until you can verify behavior with a canary + real traffic.

Open PR/Commit

@@ -356,10 +356,17 @@ def close(self):
 
     def start(self, argv=None):
+        """Run :program:`celery` using `argv`.
+
+        Uses :data:`sys.argv` if `argv` is not specified.

fix.md

Option A — Upgrade to fixed release\npip install celery==5.1.2\nWhen NOT to use: This fix should not be applied if the documentation is already present.\n\n

Why This Fix Works in Production

Trigger: Missing Documentation: celery.Celery.worker_main
Mechanism: Reintroduces docstrings for the 'start' and 'worker_main' methods in the Celery application, addressing the missing documentation issue.
Why the fix works: Reintroduces docstrings for the 'start' and 'worker_main' methods in the Celery application, addressing the missing documentation issue. (first fixed release: 5.1.2).

Production impact:

If left unfixed, retries/timeouts can trigger duplicate external side-effects (double charges, duplicate emails, repeated writes).

Why This Breaks in Prod

Production symptom (often without a traceback): Missing Documentation: celery.Celery.worker_main

Proof / Evidence

GitHub issue: #6730
Fix PR: https://github.com/celery/celery/pull/6825
First fixed release: 5.1.2
Reproduced locally: No (not executed)
Last verified: 2026-02-09
Confidence: 0.85
Did this fix it?: Yes (upstream fix exists)
Own content ratio: 0.73

Discussion

High-signal excerpts from the issue thread (symptoms, repros, edge-cases).

Jump to Sources Open on GitHub

“Hey @pfournier1 :wave:, Thank you for opening an issue”

@open-collective-bot · 2021-04-16 · source

Failure Signature (Search String)

Missing Documentation: celery.Celery.worker_main
- [x] I have included all related issues and possible duplicate issues in this issue

Copy-friendly signature

signature.txt

Failure Signature
-----------------
Missing Documentation: celery.Celery.worker_main
- [x] I have included all related issues and possible duplicate issues in this issue

Error Message

Signature-only (no traceback captured)

error.txt

Error Message
-------------
Missing Documentation: celery.Celery.worker_main
- [x] I have included all related issues and possible duplicate issues in this issue

What Broke

Users were unable to find documentation for the worker_main function, leading to confusion.

Fix Options (Details)

Option A — Upgrade to fixed release Safe default (recommended)

pip install celery==5.1.2

When NOT to use: This fix should not be applied if the documentation is already present.

Use when you can deploy the upstream fix. It is usually lower-risk than long-lived workarounds.

Fix reference: https://github.com/celery/celery/pull/6825

First fixed release: 5.1.2

Last verified: 2026-02-09. Validate in your environment.

When NOT to Use This Fix

This fix should not be applied if the documentation is already present.

Did This Fix Work in Your Case?

Quick signal helps us prioritize which fixes to verify and improve.

Prevention

Capture the exact failing error string in logs and tests so you can reproduce via a minimal script.
Pin production dependencies and upgrade only with a reproducible test that hits the failing path.

Version Compatibility Table

Version	Status
5.1.2	Fixed

Related Issues

No related fixes found.

Cluster: celery:duplicates Celery hub Celery best practices All hubs All clusters

Related clusters: Configuration error Data consistency Duplicate processing

Sources

We don’t republish the full GitHub discussion text. Use the links above for context.

Celery Missing Documentation: celery.Celery.worker_main (Fix)