My apologies I thought that they had support. You’re right it’s just Java and .Net. As it’s relatively simple and the complete source is on GitHub, I suppose you could rewrite this for Objective-C and use it. The information just reports in via the beacon URL, though, it doesn’t create an metrics.
My suggestion would be to rewrite, convince Dynatrace to do the same, write your own, or use a competitors product as some have SDK’s for tvOS.
There is an EAP program for the OpenKit native library that would let you instrument C applications - perhaps that can help. There’s an email there you can try to reach out to to see if it is relevant.