An Azure Availability Set is an Azure service that provides high availability to two or more member VMs by deploying them in different fault domains and update domains. Fault domains ensure that the VMs run on different host servers, compute racks, storage units, and network switches. Update domains ensure that maintenance outages for host hardware do not occur at the same time.
Azure Availability Set information for a platform is compiled through discovery. You can include or exclude each discovered Availability Set resource for the Platform resource.