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1. Configure the performance baseline.
2. View suggested alert thresholds. Ideally you should wait until the baseline period is over. About 24 hours after collections begin, SQL Diagnostic Manager displays a bar in green with black diagonal lines for related alerts on the Alert Configuration window, as shown in the following image. This bar represents you recommended reference range.
   
3. As your performance baseline period ends, text appears at the top of your Alert Configuration window regarding available recommendations. Click the Alert Recommendation text to open the Alert Recommendations window for your SQL Server instance. This window allows you to see the thresholds SQL Diagnostic Manager recommends based on the data collected during your performance baseline
4. Either apply the alert recommendations or tweak your thresholds.