The following Linux server distros will be supported by the coming preview for Azure Defender, per this Microsoft document: Red Hat Enterprise Linux 7.2 or higher CentOS 7.2 or higher ...

Once attached, you can use Azure Policy to apply guest configurations inside the server, automatically onboard to Defender for Endpoint (EDR) through Defender for Cloud, collect logs for Microsoft ...

The diagram also shows rationales for when to use Azure Arc. According to that diagram, Azure Arc-enabled SQL Server is best for organizations wanting to use existing applications with Azure ...