4.4.7

:release-date: 2020-07-31 11.45 P.M UTC+6:00
:release-by: Asif Saif Uddin

• Add task_received, task_rejected and task_unknown to signals module.
• [ES backend] add 401 as safe for retry.
• treat internal errors as failure.
• Remove redis fanout caveats.
• FIX: -A and --args should behave the same. (#6223)
• Class-based tasks autoretry (#6233)
• Preserve order of group results with Redis result backend (#6218)
• Replace future with celery.five Fixes #6250, and reraise to include
• Fix REMAP_SIGTERM=SIGQUIT not working
• (Fixes#6258) MongoDB: fix for serialization issue (#6259)
• Make use of ordered sets in Redis opt-in
• Test, CI, Docker, style and minor doc impovements.