If you have SQL Server 2019 installed and are using Availability Groups you may incur messages that look like the below message in your SQL Server Errorlog.
UpdateHadronTruncationLsn(6) (force=0): Primary: 0:0:0 Secondary: 892:4720:2 Partial Quorum : 0:0:0 Aggregation: 892:4720:2 Persistent: 892:382:4
According to Microsoft (unofficially as I did not hear this personally), there will be a fix in CU6 for SQL 2019 that will remove these messages by default and if you enable Trace Flag 3605 then it will turn them on to be logged as below.
DBCC TRACEON(3605, -1)
If this changes, I will come and update this post.
Thanks for listening. Have a great day and stay safe and happy!