---
title: "Modifying Event Definitions"
slug: "modifying-event-definitions-tg"
updated: 2026-10-27T17:23:14Z
published: 2026-10-27T17:23:14Z
canonical: "docs.vastdata.com/modifying-event-definitions-tg"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vastdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Modifying Event Definitions

1. From the left navigation menu, select Alarms & Events and then Event Definitions.
2. In the Event Definitions page that opens, find the event definition you want to modify and note its event type (*Object Modified*, *Threshold* or *Rate*).
3. Right-click the event definition that you want to modify, and select Edit.

The Event Definition dialog appears.
4. Under Event, review and change the settings depending on the event type:

  - For events of the *Object Modified* type:

| Severity | Determine the severity of the alarm that is raised when this event occurs. |
| --- | --- |
| Trigger On | Specify the value or the monitored property at which to trigger an alarm. |
| Trigger Off | Specify the value or the monitored property at which to trigger off an alarm. |
  - For events of the *Threshold* type:

| Severity | Determine the severity of the alarm that is raised when this event occurs. |
| --- | --- |
| Operator | Select the operator to be used when comparing the monitored property value with the threshold: - greater than. The alarm is triggered when the monitored property increases to higher than the specified threshold value. - greater equal. The alarm is triggered when the monitored property increases to the specified threshold value or higher. - lower than. The alarm is triggered when the monitored property falls below the specified threshold value. - lower equal. The alarm is triggered when the monitored property falls to the specified threshold value or below it. |
| Threshold | Specify the threshold value of the monitored property. |
  - For events of the *Rate* type:

| Severity | Determine the severity of the alarm that is raised when this event occurs. |
| --- | --- |
| Operator | Select the operator to be used when comparing the monitored property value with the threshold: - greater than. The alarm is triggered when the monitored property increases to higher than the specified threshold value. - greater equal. The alarm is triggered when the monitored property increases to the specified threshold value or higher. - lower than. The alarm is triggered when the monitored property falls below the specified threshold value. - lower equal. The alarm is triggered when the monitored property falls to the specified threshold value or below it. |
| Threshold | Specify the threshold value of the monitored property. |
| Timeframe | Define the period of time during which to monitor the property. Enter a number followed by a time unit without spaces. Valid time unit designations: - `s` - seconds - `m` - minutes - `h` - hours - `D` - days - `M` - months For example: *1h* |
5. Under Action, optionally select the actions that are performed when the event is triggered. You can choose to send a notification to an external application using a webhook, and send email notifications to selected recipients.

  1. To send a notification to specific external applications using webhooks, select the webhooks for these applications from the Select Webhookdropdown. If none are selected, notifications are sent to all active webhooks.

> [!NOTE]
> Note
> 
> Define webhooks in the Webhooks tab. See [Managing Webhooks](/docs-5-3/docs/en/managing-webhooks-tg) for more details.
  2. To send an email notification, enter email addresses, comma separated, in Email Recipients.

> [!NOTE]
> Note
> 
> An SMTP server and sender email address must be defined in the SMTP Setup tab of the Notifications section of the > Settings page. See [Default Notification Actions](/docs-5-3/docs/en/default-notification-actions-tg).Default Action Settings
  3. To disable the above actions, slide Disable actions to the right.
  4. To perform the actions on in the case of an alarm, slide Alarm only to the right, otherwise all events for this definition will trigger the actions.

For example, if the object type is *CNode*, and the Property is *state* , then if Alarm Only is disabled, any change in state of a CNode will trigger the actions you selected for this event.
6. Click **Save** to save the changes or click Save & Test to save your changes and send a test notification.