Amazon MQ now provides support for RabbitMQ version 3.11, a new minor version release, which includes several fixes and improvements to the previous versions of RabbitMQ supported by Amazon MQ – 3.8, 3.9, and 3.10. With RabbitMQ version 3.11, Amazon MQ is also introducing a default operator policy on each virtual host with high availability properties enabled.
Source:: Amazon AWS