SQL Server dedicates threads for databases participating in Availability Groups. This wait type accumulates while these threads are waiting for tasks to be assigned to them. As it is an idling wait high values are expected and can be ignored

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  1. Safe to ignore

Additional research

Monitor SQL Server AlwaysOn Availability Groups
MSDN Blog: Monitor Performance for AlwaysOn Availability Groups

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Consider using ApexSQL Monitor, a Windows and SQL Server monitoring tool able to track SQL Server wait types, including the individual query wait statistics

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