Managing Thresholds

Thresholds allow you to define triggers against any data retrieved by the SNMP collector, and generate events, notifications, and alarms from those triggers. You can add, remove, and modify thresholds.

Creating Thresholds

To create a threshold:

Select Network Monitoring > Admin > Manage Thresholds.
The Threshold Configuration page appears and lists the threshold groups that are configured on the system.
To create a new threshold for a threshold group, select Edit next to the threshold group.
The Edit group page appears.
Select Create New Threshold.
The Edit threshold page appears.
To configure the threshold, specify appropriate values for the following threshold fields:
- Type—Specify high, low, relativeChange, absoluteChange, or rearmingAbsoluteChange.
- Datasource–Specify a name for the datasource.
- Datasource type—Specify a datasource type from the list.
- Datasource label—Specify a type from the list.
- Value—Use depends on the type of threshold.
- Re-arm— Specify the name of a custom UEI to send into the events system when this threshold is re-armed. If left blank, it defaults to the standard thresholds UEIs.
- Trigger–Specify the number of times the threshold must be exceeded in a row before the threshold is triggered.
  
  Note:
  A trigger is not used for relativeChange thresholds.
- Description—(Optional) A description used to identify the purpose of the threshold.
- Triggered UEI— A custom UEI to send into the events system when the threshold is triggered. If a UEI is not specified, it defaults to the standard thresholds UEIs in the format uei.opennms.org/<category>/<name>.
- Re-armed UEI—A custom UEI to send into the events system when this threshold is re-armed. If left blank, it defaults to the standard thresholds UEIs.
Select Save to create the threshold in Junos Space Network Management Platform.
(Optional) To configure a resource filter for a threshold:
1. Configure a filter operator to define the logical function to apply for the threshold filter to determine whether or not to apply the threshold. An OR operator specifies that if the resource matches any of the filters, the threshold is processed. An AND operator specifies that the threshold is processed only when a resource match all the filters.
2. Specify a field name for the filter operator to define the logical function to apply for the threshold filter to determine whether or not to apply the threshold.
3. Specify the mathematical expression with data source names that is evaluated and compared to the threshold values.
4. Select the Add action to add the filter to a threshold.

To create an expression-based threshold:

Select Network Monitoring > Admin > Manage Thresholds.

The Threshold Configuration page appears and lists the threshold groups that are configured on the system.
To create a new threshold for a threshold group, select Edit next to the threshold group.

The Edit group page appears.
Select Create New Expression-based Threshold.

The Edit expression threshold page appears.
To configure the threshold, specify appropriate values for the following expression threshold fields:
- Type—Specify high, low, relativeChange, absoluteChange, or rearmingAbsoluteChange.
- Expression–Specify a mathematical expression that includes the datasource names which are evaluated and compared to the threshold values.
- Datasource type—Specify a datasource type from the list.
- Datasource label—Specify a type from the list.
- Value—Use depends on the type of threshold.
- Re-arm— Specify the name of a custom UEI to send into the events system when this threshold is re-armed. If left blank, it defaults to the standard thresholds UEIs.
- Trigger–Specify the number of times the threshold must be exceeded in a row before the threshold is triggered.
  
  Note:
  A trigger is not used for relativeChange thresholds.
- Description—(Optional) A description used to identify the purpose of the threshold.
- Triggered UEI— A custom UEI to send into the events system when the threshold is triggered. If a UEI is not specified, it defaults to the standard thresholds UEIs in the format uei.opennms.org/<category>/<name>.
- Re-armed UEI—A custom UEI to send into the events system when this threshold is re-armed. If left blank, it defaults to the standard thresholds UEIs.
Select Save to create the expression threshold in Junos Space Network Management Platform.
(Optional) To configure a resource filter for an expression threshold:
1. Configure a filter operator to define the logical function to apply for the expression threshold filter to determine whether or not to apply the expression threshold. An OR operator specifies that if the resource matches any of the filters, the expression threshold is processed. An AND operator specifies that the expression threshold is processed only when a resource match all the filters.
2. Specify a field name for the filter to define the logical function to apply for the threshold filter to determine whether or not to apply the threshold.
3. Specify the mathematical expression with data source names that are evaluated and compared to the threshold values.
4. Select the Add action to add the filter to an expression threshold.

Modifying Thresholds

To modify an existing threshold in a threshold group:

Select Network Monitoring > Admin > Manage Thresholds.
The Threshold Configuration page appears and lists the threshold groups that are configured on the system.
To create a new threshold for a threshold group, select Edit next to the threshold group.
The Edit group page appears.
To modify an existing threshold, select the Edit option that appears to the right of the threshold you want to update.
The Edit Threshold page appears and displays the threshold fields.
Modify the threshold fields you want to update.
Click Save to update the threshold.
(Optional) To add a resource filter for the threshold:
1. Specify a filter operator to define the logical function to apply for the threshold filter to determine whether or not to apply the threshold. An OR operator specifies that if the resource matches any of the filters, the threshold is processed. An AND operator specifies that the threshold is processed only when a resource match all the filters.
2. Specify a field name for the filter to define the logical function to apply for the threshold filter to determine whether or not to apply the threshold.
3. Specify the mathematical expression with data source names that are evaluated and compared to the threshold values.
4. Select the Add action to add the filter to the threshold.

Deleting Thresholds

To delete a threshold:

Select Network Monitoring > Admin > Manage Thresholds.
The Threshold Configuration page appears and lists the threshold groups that are configured on the system.
To delete a threshold from a threshold group, select Edit next to the threshold group.
The Edit group page appears.
To delete an existing threshold, select Delete.

ON THIS PAGE

Managing Thresholds

Creating Thresholds

Modifying Thresholds

Deleting Thresholds

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