Enter a percentage value for the Warning Threshold. For example, if you'd like to know when your Used Capacity reaches 80%, enter 80 to trigger a warning alert. If the Alert policy is setup to recognize a warning threshold, when this value is reached, an alert could be issued.

Enter a percentage value for the Critical Threshold. For example, if you'd like to know when your Used Capacity reaches 90%, enter 90 to trigger a critical alert. If the Alert policy is setup to recognize a critical threshold, when this value is reached, an alert could be issued.

Click Show Baseline Chart to display a chart of historical data for the selected threshold for VM Guest Disks. The chart is based on your selected scope. You can adjust the Time Period as required to examine the historical results. This helps you to determine the numbers for your warning and critical thresholds. You can derive your own numbers from the data the create threshold values or apply the baseline numbers directly.