Ask HN: Cocaine (PaaS) Alternatives in 2019

I used to work in a big company which had tens of thousands of apps running on their own autoscaling infrastructure and I was wondering if there is anything similar that just works out of the box.

Cocaine seemed to deliver that promise which I understood as an autoscaling, resilient swarm of apps which talk the same protocol (RPC) despite being written in different technologies.

I see the project went inactive, are there any alternatives?