[Scaevolus]

We talked to the Zuul team, they use more parallelism but it's similar: https://zuul-ci.org/docs/zuul/user/gating.html

Most of the complexity and suffering of a submit queue evolves from the interactions between your VCS and CI systems. Keeping things simple is great! Kubernetes' CI system is Prow, which runs the tests as pods in a Kubernetes cluster. Dogfooding like this is great, since the team you're providing CI for can also help fix bugs that arise.