Go ahead and create a new device collection and then use this query:
select * from SMS_R_System inner join SMS_G_System_COMPUTER_SYSTEM on SMS_G_System_COMPUTER_SYSTEM.ResourceId = SMS_R_System.ResourceId where SMS_G_System_COMPUTER_SYSTEM.Roles like "%Domain_Controller%"
Save the query and you should now see a collection of all your domain controllers.
Just be careful with copying and pasting in case the formatting of the symbols comes out incorrectly. Check these first if your collection fails to import and devices.
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