One database service that supports horizontally scaled graphs is Azure CosmosDB Graph API: https://docs.microsoft.com/en-us/azure/cosmos-db/graph-intro...

Worth to take a look if you need a managed Gremlin solution with some degree of global distribution.

In the sign up page (https://www.microsoft.com/en-us/server-cloud/sql-server-on-l...) you'll find this quote: "Please note that at this time, SQL Server on Linux is available on Ubuntu or as Docker image." :)