I've been keeping an eye on Sturdy [1], a more performant, high level, and opinionated version control system. As a bonus, it seems to be compatible with Git.
How does this project relate to other tools in the same space, such as kube-score [1] and popeye [2]?
From my point of view, the approach taken by for example kube-score where resources are matched with each other to give a better overview is extremely powerful, for example it will notice if a Service is misconfigured and wouldn't match any Pods.
Popeye is a very cool project with the same general aim - it checks a lot of the same things as Polaris. It's very much CLI-first (and does an amazing job at that), while Polaris is happy to run as a CLI, a web dashboard, a validating webhook, or a CI/CD check.
kube-score I hadn't heard of, but looks very cool. You're right on matching resources - one of the requests we've gotten is to be able to check that every deployment comes with a PDB, which it looks like kube-score checks. Definitely a feature we're looking into!
https://getsturdy.com/