Service mesh and Async services

Please note that Istio can control non-HTTP protocols on top of TCP, including providing Mutual TLS Authentication. See this example of mTLS for HTTPS (treated as opaque TCP) - https://preliminary.istio.io/docs/tasks/security/https-overlay.html.

I am not familiar with AMQP, but since it is a protocol on top TCP, it should be possible to control it by Istio as opaque TCP.