Application.LogWarningsToApplicationOutput obsolete?

I used Application.LogWarningsToApplicationOutput (https://blog.verslu.is/xamarin/xamarin-forms-xamarin/logwarningstoapplicationoutput-xamarin-forms/) but I now get a message telling me that it is obsolete. It also says to assign the LogWarningsListener. Could be that this is straightforward but I can not find any docs about this LogWarningsListener. Anyboody any sample code how to solve this?
tia
Martin