Help Setting Up Availability Group Monitoring in SQL

I don't know a ton about SQL but peeking at the DataSource code for Microsoft_SQLServer_AlwaysOnAvailabilityGroups it seems to be running the below SQL statement to get a list of instances. Might want to run that to see what it outputs, if anything, and why.

SELECT @@servicename AS instanceName,
                             ag.group_id ,
                             ags.primary_replica ,
                             ag.name  ,
                             ag.health_check_timeout ,
                             ag.automated_backup_preference
                    FROM sys.availability_groups ag
                    INNER JOIN sys.dm_hadr_availability_group_states ags ON ags.group_id = ag.group_id