Use RabbitMQ for a call center handling thousands of calls per second. It worked fine integrated with Flower, Celery and Python...but once we went production, became a black box which every setting was hard to find documentation or support, we ended up having to build huge Machines with tons of memory and CPU and still saw messages lost no explanation. Ended up moving to PubSub and rebuild the whole app
Rabbit is not a "turn it on and hope it works" kind of solution and if it's a blackbox to you then you shouldn't use it. AMQP is a relatively fancy protocol and Rabbit is endlessly configurable which is both a pro and a con. You will need to develop expertise in Rabbit to use it well at scale.
