FYI – this documentation flood is temporary. We're working on it! We're sorry – we're tortured by this as well. More details here: https://github.com/scala/scala.github.com/issues/795
We essentially connected docs.scala-lang.org to users.scala-lang.org so documentation-related questions and discussions could be hosted on users.scala-lang.org but be shown on docs.scala-lang.org. Theoretically a good idea.
Long story short, when you embed Discourse in a website (which is a supported feature of Discourse), something weird happens. When people visit pages with embedded Discourse comments, the first time a user loads the page after embedded Discourse has been added, a thread is automatically created on users.scala-lang.org that corresponds to that documentation page.
This is nuts, and I've reported it as a bug to the Discourse people. What would make more sense is a new thread created when someone attempts to leave a comment on that page.
In any case, @gourlaysama, thank you for the idea to mute. I'll do that now and when this is resolved, hopefully globally unmuting will make it useful again.