Where did ARURF go?

I just loaded LOL here 5 minutes ago and my beloved URF mode is now missing :/ I have only played LOL since the beginning of January of this year but I understand that mode has been around before and was taken away.. How long was it gone for before? Or better yet, when might it be back?
Best New

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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