From what I’ve read it is channels that the discord server owner/admins have flagged as discoverable and then users themselves have a setting to still hide their messages.

This setting seems to be defaults to hide unless you are in the USA and then it defaults to show.

Yeah this is my first time learning this too and k8s is something that comes up almost daily for me.

I18n is the only one that clues in for me (internationalization).