Have you heard of OpenShift 4? Self-hosted Kubernetes by Red Hat. Every little piece of the control plane is its own 'operator' (basically a microservice) and every operator is developed in its own repo.

A github search for 'operator' in the openshift org has 178 results:

https://github.com/orgs/openshift/repositories?language=&q=o...

Not all are repos hosting one or more microservices, but most appear to be. Best of luck ensuring consistency and quality across so many repos.