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Hi,
Based as I know, the DBFreeSpacePercent can be calculated by the following Algorithmic formula:
DBFreeSpacePercent=DBFreeSpaceMB/(DBFreeSpaceMB+DBSizeMB).
In our environment, DBFreeSpacePercent=1061733.5/(1061733.5+5057321)=17.35%
For the alert "MSSQL on Windows: Database ROWS Out of Space", we can increase the database size on SQL database to see if it can be fixed.