Azure uses managed disks (based on VHDX format) but abstracts the metadata layer. You will never see vhdx.mrt in Azure blob storage. However, Azure Stack HCI on-premises may generate these files during live migration failures.
While VHDX.MRT files offer benefits, there are some potential issues to be aware of: vhdx.mrt file
If you intended to ask about or using the Microsoft MRT tool , please clarify, and I can provide a dedicated guide for those topics instead. Azure uses managed disks (based on VHDX format)