# Editing PredictiveThresholds

The threshold must be created by the Add Threshold functionality or already be defined in the system before you can edit it.
1. Double-click the threshold in the list. The Edit Threshold dialog box appears.
2. Enter or select values to define the threshold:
• Name- Displays the value for the ID you entered on the Add a New Threshold dialog.
• Description- Description of the threshold that you entered on the Add a New Threshold dialog. The description is included in each event that is created from this threshold.
• Data Point- Select the data point to which this threshold will apply.
• Event Class- Select the event class of the event that will be triggered when this threshold is breached.
• Type- Type of threshold that you selected. You cannot change the type of threshold. If you want a different type of threshold, you need to create a new one and assign the correct type.
• Enabled- Select the check box to enable the threshold, or clear the check box to disable it.
• Severity- Select the severity level of the first event triggered when this threshold is breached.
• Aggregate Function- The type of function to use when analyzing the past data. For example, do you look at the peak values in the past or average values. The default value is max.
• Algorithm- Algorithm to use for the projection. Value is linear.
• Projection Algorithm Parameters- Some algorithms need additional parameters. Enter them as required.
• Amount of Data Used in Projection- Set the amount of historical data to be used when calculating the projection.
• Send an Event if the Threshold is Breached in the Next- Set the timeframe in days, weeks, or months. If the threshold is breached within this time period in the future, an event will be sent.
• Minimum Value- If this field contains a value, then each time one of the select data points falls below this value an event is triggered. This field may contain a number or a Python expression. An expression is required when using gauge or calculated values. When using an expression, the variable here references the device or component for which data is being collected. For example, a 90% threshold for interface speed might be specified as:
(here.linkSpeed or 1e10) /8 * .9
The division by 8 is needed because interface speed frequently is reported in bits/second, where the performance data is bytes/second.
• Maximum Value- If this field contains a value, then each time one of the selected data points goes above this value an event is triggered. This field may contain a number or a Python expression. An expression is required for gauge or calculated values.
3. Click Save to confirm the edits.