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For those that prefer, lore link:

(it's maintained by kernel.org and is more official that lkml.org, which helped us a lot before we had an official solution)

Is there a more modern interface like Github / gitlab / gitea?

The one you linked doesn't support the markdown in the post and it's hard to see the changes since it's in like 20 different emails?s.

In this case, yes. Though it doesn't include replies (since this is just the staging ground the rust-for-linux devs are using)