Samir Boulahtit
3e650ff863
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When a Celery task failed, on_failure passed extra={"args": ..., "kwargs": ...}
to logger.error. Python's logging.makeRecord rejects any extra key that
collides with a built-in LogRecord attribute, and "args" is one (used for
printf formatting). The KeyError raised inside the error handler then
cascaded through Celery's trace.handle_failure, masking the real task
exception entirely.
Rename the keys to task_args / task_kwargs.
Surfaced while debugging why the loyalty welcome email never got sent —
the underlying task was failing, but the on_failure handler crashed before
logging the real cause, leaving nothing in worker logs to investigate.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>