[Bug] logger_task not registered in Celery worker — process_logs tasks silently dropped

Description

plane.bgtasks.logger_task.process_logs is queued by plane-api on every API request (audit logging via APITokenLogMiddleware), but the Celery worker discards every message with a KeyError because the module is not listed in CELERY_IMPORTS.

Root cause

plane/bgtasks/logger_task.py exists and defines a @shared_task, but it was never added to CELERY_IMPORTS in plane/settings/common.py when the module was introduced in #8245.

The worker only loads modules listed in CELERY_IMPORTS, so process_logs is never registered.

Impact

• API activity logs are not saved (audit trail broken for APIActivityLog / MongoDB logging)
• ~1 error per API call in the worker logs (depending on traffic, tens to hundreds per hour)
• All other Plane functionality works normally

Error in worker logs

Received unregistered task of type 'plane.bgtasks.logger_task.process_logs'.
The message has been ignored and discarded.

Did you remember to import the module containing this task?

Traceback (most recent call last):
  File ".../celery/worker/consumer/consumer.py", line 659, in on_task_received
    strategy = strategies[type_]
               ~~~~~~~~~~^^^^^^^
KeyError: 'plane.bgtasks.logger_task.process_logs'

Fix

Add "plane.bgtasks.logger_task" to CELERY_IMPORTS in plane/settings/common.py.

A one-line fix is ready in a PR.

Versions

• plane-backend:stable (digest sha256:60fb33fa...)
• Confirmed present in both main and preview branches as of April 2026

Start in plane/settings/common.py by inspecting CELERY_IMPORTS, then compare it with the task defined in plane/bgtasks/logger_task.py. Confirm that the worker registers plane.bgtasks.logger_task.process_logs and that API activity logs are no longer discarded; the issue does not name a specific test file.