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SQL Server 2016 AlwaysOn Asynchronous 2 node setup - potential for data loss and being able to tell what point data was lost after failover

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New to AlwaysOn.  Looking at setting up AlwaysOn 2 nodes asynchronous commit mode between our two data centers.  What I am wondering with this setup is: what is the potential for data loss, and if I do failover, how do I know how recent my data data is/what was lost so I can convey that to users (aka:  "Anything you did after 11:27am has to be re-entered")?  Thanks!

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