Supplying this will prevent queue clashes between various ATAT sites sharing the same Redis instance. Note that the Celery documentation is currently wrong about the name for configuring this: https://docs.celeryproject.org/en/latest/userguide/configuration.html#std:setting-task_default_queue It specifies `CELERY_TASK_DEFAULT_QUEUE`, but `CELERY_DEFAULT_QUEUE` is the value that Celery currently looks for. This appears to be fixed in on an upcoming release: https://github.com/celery/celery/issues/5575 This is worth keeping an eye on, since the configuration key could change in the future.