3.3.1

• Ensure traceback is stored properly for error results.
• Restart the stats recorder in forked children via os.register_at_fork. Previously the writer thread existed only in the process that called enable_stats(), so a consumer w/ worker_type='process' (or a preforking web server that loads the app before forking) buffered task events in its workers but never wrote them, and the dashboard showed tasks stuck on "enqueued".

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