Comment # 5 on bug 1154112 from Marcel Kuehlhorn

(In reply to Nathaniel Graham from comment #4)
> Ping. Is something blocking this?

The SR for Telegram 1.8.15 was held up by legal review for some time and
finally accepted 2 weeks ago.

With that update Telegram on Tumbleweed (and Leap 15.2 as that was accepted
today) now allows using native notifications.