This is a question for my GOS degoogled gang. As we all know, apps that provide their own push notification support are typically too taxing on the battery and the best way is to use versions of apps that supports unified push: https://unifiedpush.org/
I've successfully switched to use 3 apps that use UP; however, telegram is the last one that's got me stuck. I found https://github.com/Mercurygram/Mercurygram that implements UP support for telegram; however, after hours of testing various providers and servers I've been unable to get push notifications to work in it. Just wondering if anyone here has been able to get it to work or whether the issue is entirely specific to me.