Code quality metrics are very subjective and depend on the domain and the programming language. They can add value, but I rarely see tools that work well without initial configuration.
Related Posts
Blogging about my programming language project: choosing the basic syntax!
https://www.garden-lang.org/blog/syntax.html
Caddy is really growing on me. It's nice having a web proxy that includes letsencrypt functionality without any additional configuration.
I've tended to use nginx with a separate letsencrypt setup for projects before, and it's much more awkward.
I've added an eval button to the website of my programming language!
It's a been a lot of work to lock down appropriately. It still needs some UI polish but it's so nice to be able to try snippets immediately.
https://www.garden-lang.org/