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Pulumi worked great for me at my last job. I've heard it's not so fun with Python, but I thought it was really nice to use with Typescript.

If you count Nix and Guix, there's that.

Otherwise the classics (Ansible/Puppet/Chef/Saltstack) seem to still hold their positions somewhat.

(I don't count Terraform/Pulumi/OpenTofu in this category)

I use a Chef setup based on how Airbnb did config management in 2013. It ain’t broke, and Ruby is an amazing language for DSLs like system configuration. I never got along with Puppet because I’m annoyed I can’t use Ruby for everything.

The answer a few years ago was nothing (eg just use Railway or other actual PaaS) or Terraform.

Anything else mature and worth trying?

Although I guess you mean individual machine config not operations in general!

going by the post you reply to it is code again.