I wasn't able to find anything in the past questions/blogs - does CA Introscope support Netty (https://netty.io/ ) Monitoring?
If it is NOT supported by the product OOTB - do we have a field pack somewhere in the community?
I looked at netty.io has part of a monitoring solution for Akka and Play. It would take more time than I could give it so it was handed over to engineering to evaluate.
I'd suggest you open an Idea and ask the community to vote on this to gauge prioritization on the request.