I'm perpetually curious about what kind of resource usage you'd expect given those 250 repos, and which runtime you're deploying.

I've recently been playing with Go and looking at existing JVM-based services (Spring Boot + starters + our microservices). We've seen rewrites of small services change from ~500MB of RAM to ~10MB of RAM. 250 Go-based services would probably fit very comfortably on a small cluster of cheap-ish servers, depending on what they're doing and how much traffic they're handling.