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When setting the thresholds for your Filegroup Space Full (Percent) alert, click Advanced > Autogrow Settings (see image below) and SQL Diagnostic Manager provides a choice for you to calculate your displayed percentage. Select Yes, alert on the current used size divided by the maximum possible size to take possible autogrowth into consideration when calculating the filegroup space full percentage. Select No, alert on the current used size divided by the current file size to calculate the filegroup space full percentage based only on the current size of the database disk file.
