This alert is based off data collected as part of the Database Size custom metric: https://thwack.solarwinds.com/content-exchange/database-performance-analyzer/m/custom-metrics/3452
It checks the max collected value from today, compared to yesterday and returns a percent of growth. The threshold are based on the percent growth, so it you want to be notified when a database grows more than 10 or 20%, use these thresholds:
Note: after pasting in this SQL script, modify the value for the variable named @DPAMetricName to match the name within DPA when editing the custom metric: