Events get published to RabbitMQ queues that are never read

[praseodym]

On the testserver we observe that events are published to queues with a uuid name, but these events are never read:

The messages look like this:

We've observed similar queues with thousands of events before the testserver was restarted. I'm currently not sure where these events get created.

[praseodym]

We think that these queues might be created by Celery because use the RabbitMQ result backend. The result is only used by robot tests, not in production.