Long time ago I installed a msata drive on my turris and moved all partitions to this following this guide:
So currently my eMMC is not in use at all. However the router is constantly sending notifications about running containers in the internal memory is unsupported bla bla bla…
I think that there is a very easy way to detect if the eMMC is in use or not, and that is comparing the size of the internal memory device and avoid sending notifications of this. I don’t know if there is a way to disable it completely.