Android P feature spotlight: Mark WiFi as metered from the network details screen
Android is designed to be gentle with your mobile data, but all bets are off when you get on WiFi. Your phone will likely save large downloads until the instant you reconnect to WiFi, but not all networks should be treated the same. Some WiFi hotspots are metered, and Android P makes it quicker and easier to tell the device when that is the case.
It has been possible to mark a network as metered in the last few versions of Android, but it’s buried in the Data Saver settings.
Android P feature spotlight: Mark WiFi as metered from the network details screen was written by the awesome team at Android Police.