SQL Server 2016: Using Direct Seeding feature for adding databases to availability group

https://blog.dbi-services.com/sql-server-2016-alwayson-direct-seeding-and-performance-considerations/

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Troubleshooting unexpected AG failover issues, lease timeout errors and new extended events

https://blogs.msdn.microsoft.com/alwaysonpro/2014/11/26/diagnose-unexpected-failover-or-availability-group-in-resolving-state/

https://blogs.msdn.microsoft.com/psssql/2012/09/07/how-it-works-sql-server-alwayson-lease-timeout/

https://blogs.msdn.microsoft.com/alwaysonpro/2016/02/23/improved-alwayson-availability-group-lease-timeout-diagnostics/

https://blog.dbi-services.com/sql-server-alwayson-troubleshooting-improvements-with-new-service-packs/