Enable an option to see per-app data usage.

[Yashwant4]

I am on a metered connection and only get a limited bandwidth (1.5gb) after which the internet speed is reduced. So, I was wondering if there could be a way to see exactly which apps and processes have used how much data, and possibly set a limit on them? Windows 10 and Android both have the feature to monitor per-app data usage through Settings, in android we can also set if an app is allowed to access internet in the background.