[NomDePlum]

Second this.

Reference for anyone looking I to it: https://c4model.com/

There is also quite a lot of options for helping create these diagrams. I've found https://structurizr.com/ to be the best of what I've tried so far.

[Onawa]

I like the idea behind structurizr, but I found the syntax to be too constraining and the tooling around it to be difficult to deal with. That was 2 years ago though,maybe I should revisit it.

[Terretta]

icepanel implements tooling

https://icepanel.io/

[NomDePlum]

Looks really good. Some nice articles in the blog section too.

[NomDePlum]

Not sure it will have changed that much.

There are definitely limitations, for me being able to encode and version control diagrams and system documentation alongside a codebase made the tradeoff worth it.