Observação
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Questão
As the Android platform evolves certain versions will be deprecated and removed. How we decide if a platform is deprecated largely depends on whether the Android NDK continues to support the platform in question. It also depends on whether the Android Support Libraries support that platform.
If both the Android NDK and the Android Support Libraries have removed support for a particular apiLevel, then it is highly likely that support for the API level will be deprecated and removed from .NET for Android.
If you are seeing this warning, it is because your $(TargetFrameworkVersion) is set to a value which is likely to be deprecated in the near future.
Solução
To remove this warning, update your $(TargetFrameworkVersion) to use the latest stable platform.
Your android:minSdk value within AndroidManifest.xml can still mention older versions of the android platform.