- Update to 5.02:
* Fix _autodiscover_tasks_from_fixups (#6424).
* Flush worker prints, notably the banner (#6432).
* Breaking Change: Remove ha_policy from queue definition. (#6440)
* This argument has no effect since RabbitMQ 3.0. Therefore, We feel
comfortable dropping it in a patch release.
* Python 3.9 support (#6418).
* Regression: When using the prefork pool, pick the fair scheduling strategy
by default (#6447).
* Preserve callbacks when replacing a task with a chain (#6189).
* Fix max_retries override on self.retry() (#6436).
* Raise proper error when replacing with an empty chain (#6452)
* Specify UTF-8 as the encoding for log files (#6357).
* Custom headers now propagate when using the protocol 1 hybrid messages
(#6374).
* Retry creating the database schema for the database results backend in case of a race condition (#6298).
* When using the Redis results backend, awaiting for a chord no longer hangs
when setting :setting:`result_expires` to 0 (#6373).
* When a user tries to specify the app as an option for the subcommand, a
custom error message is displayed (#6363).
* Fix the --without-gossip, --without-mingle, and --without-heartbeat options
which now work as expected. (#6365)
* Provide a clearer error message when the application cannot be loaded.
* Avoid printing deprecation warnings for settings when they are loaded from
Django settings (#6385).
* Allow lowercase log levels for the --loglevel option (#6388).
* Detaching now works as expected (#6401).
* Restore broadcasting messages from celery control (#6400).
* Pass back real result for single task chains (#6411).
* Ensure group tasks a deeply serialized (#6342).
* Fix chord element counting (#6354).
* Restore the celery shell command (#6421).
* Breaking Change Remove AMQP result backend (#6360).
* Warn when deprecated settings are used (#6353).
* Expose retry_policy for Redis result backend (#6330).
* Prepare Celery to support the yet to be released Python 3.9 (#6328).
* More cleanups of leftover Python 2 support (#6338).
* Bump minimum required eventlet version to 0.26.1.
* Update Couchbase Result backend to use SDK V3.
* Restore monkeypatching when gevent or eventlet are used.
* Allow to opt out of ordered group results when using the Redis result
backend (#6290).
* Breaking Change Remove the deprecated celery.utils.encoding module.
* Breaking Change Drop support for the Riak result backend (#5686).
* Breaking Change pytest plugin is no longer enabled by default (#6288).
Install pytest-celery to enable it.
* Breaking Change Brand new CLI based on Click (#5718).
* Bump Kombu version to 5.0 (#5686).
* Removed most of the compatibility code that supports Python 2 (#5686).
* Modernized code to work on Python 3.6 and above (#5686).
- Update BuildRequires/Requires.
- Add patch move-pytest-configuration-to-conftest.patch to fix testsuite.