Monitoring Availability Groups can be tricky.  The DMVs don’t update the log_send_rate and redo_rate all the time especially if nothing is happening so if you try to use those for calculations when monitoring you could false results worse yet pages in the middle of the night.  In order to calculate the log_send_rate and redo_rate you need to capture the perfmon counters ‘Log Bytes Flushed/sec’, ‘Redone Bytes/sec’, and ‘Log Bytes Received/sec’ into temporary tables WAITFOR 1 second then capture them again.  Below is query that captures this along side what you see in the DMV for when Microsoft might fix the issue.

If you use Get-CMSHost function from my Running SQL Scripts Against Multiple Servers Using PowerShell post you can run this against a group of servers and check the status of all your Availability Groups at once.

Series NavigationMonitoring Availability Groups Part 2 – SQL Agent Alerts >>
Tracy Boggiano
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Tracy Boggiano

Database Superhero at ChannelAdvisor
Tracy has spent over 20 years in IT and has been using SQL Server since 1999 and is currently certified as a MCSE Data Management and Analytics. She has worked on SQL Server 6.5 and up including currently SQL 2017 RC1. She enjoys monitoring, performance tuning, and high availability and disaster recovery technologies. Tracy is currently a co-organizar the for special interest group for Advanced DBA Topics for the TriPASS user group.

She also tinkered with databases in middle school to keep her sports card collection organized.

Tracy has volunteered through the NC Guardian ad Litem program since 2003 advocating for abused and neglected foster children in court.This is her passion outside of SQL Server and favorite job.More information about this program in North Carolina can be found at http://volunteerforgal.org or the national organization CASA at http://www.casaforchildren.org.
Tracy Boggiano
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