Several settings in an alarm definition can be customized. From the Alarm Definitions page, you can enable or disable an alarm, configure if an event (when true) creates an alarm, create an SNMP trap, set alarm threshold, and set alarm sensitivity. From the Alarm Definitions page, you can enable or disable detection of an alarm, whether an alarm is reported in the API/user interface, and whether a SNMP trap is emitted when an alarm is detected or resolved.

You can configure the following alarm definition settings:
Setting Control Type Description
Enabled Toggle Enables or disables detection of the alarm.
Create Alarms Toggle Enables or disables whether the alarm is reported in the API/UI.
Create SNMP Traps Toggle Enables or disables whether an SNMP trap is emitted when an alarm is detected or resolved.
Threshold Numerical value

Configures the threshold for triggering the event. This value determines if a single sample is true and triggers an event.

  • For CPU, disk, and memory alarms, threshold is the percentage usage value to indicate an alarming condition.

  • For certificate or license expiration alarms, this is the number of days before expiration, including local password expiration.
Sensitivity (%) Numerical value (percentage)

Configures the sensitivity for triggering the alarm. Sensitivity defines the conditions that trigger an alarm. (The sample size is internally defined and cannot be modified.) If the sample size is ten and sensitivity is set to 80%, then eight or more occurrences in the sample of ten raises the alarms. See the NSX-T Data Center REST API documentation.

Procedure

  1. Navigate to the Home page and click Alarms.
    The Alarms panel has two modes, as shown at the top of the panel: Alarms and Alarm Definitions.
  2. Click Alarm Definitions.
    The Alarms tab redisplays to show the Alarm Definitions panel.
  3. Right-click three vertical dots icon in the leftmost column of an alarm, and select Edit.
    The selected alarm definition expands to show the definition details, and puts the configurable settings into edit mode.
  4. Modify the settings as desired.
  5. Click Save.

What to do next

For details about alarm definitions, see View Alarm Definitions. For details about SNMP traps, see Simple Network Management Protocol (SNMP).