I was there three years ago. Most (possibly all) of what was running on bare metal was Windows/Hyper-V. Some Azure service backends ran on Linux VMs; AKS backen

I was there three years ago. Most (possibly all) of what was running on bare metal was Windows/Hyper-V. Some Azure service backends ran on Linux VMs; AKS backend for instance was on Linux I believe. Most were Windows/C# though. I know there was some initiative to allow for Linux bare metal for some internal services, I think to allow for running k8s clusters without the extra hypervisor layer(?), but it was still WIP when I left.