If I were to horizontally scale both my graphql-yoga server and prisma server (they're both on fargate), would I lose subscription functionality?

Why do you think so?

Currently the docs for this are in the works, but here you can find some useful informations: https://github.com/prismagraphql/prisma/issues/2850 I think Fargate is not a good fit currently to horizonstally scale Prisma.

What would be the recommended method, in that case?