Does github still use Rails in a sort of monolith? I like examples of "monoliths" in the wild that gasp scale as well / better than dozens of microservices painfully working together just to show me a metrics dashboard. Dont get me wrong, not against microservices, it's just that more often than not such architectures have brought more pain than good in my career. I will most of the time gladly trade the overhead of maintaining/managing microservice-glue-infrastructure for a large modular monolith.