Service Monitors

This section describes all available built-in monitors for service assurance. You can configure them to allow complex monitoring to meet the needs of your environment.

For information on how to extend the functionality of these monitors, see the Development section to contribute to the project.

Common configuration parameters

Application- or device-specific monitors are based on a generic API that provides common configuration parameters. These minimum configuration parameters are available in all monitors and describe the behavior for timeouts, retries, and so on.

Table 1. Optional common configuration parameters
Parameter Description Default


Number of attempts to test a service’s status (up or down).



Timeout for the isReachable method, in milliseconds.



Invert the up/down behavior of the monitor.


If the monitor uses SNMP, the default configuration for timeout and retry are taken from the SNMP configuration (snmp-config.xml).

Minion configuration parameters

When nodes are configured with a non-default location, the associated service monitors run on a Minion configured with that same location. If a given location has multiple Minions, the service monitor may run on any of the Minions that are currently available. To run a service monitor on a specific Minion, specify the System ID of the Minion. Use this mechanism to monitor the Minions individually.

Use the following parameters to override this behavior and control where the service monitors run.

Table 2. Optional Minion configuration parameters
Parameter Description Default


Specify the location to run the service monitor.

The location of the associated node.


Specify the system ID on which to run the service monitor.



Use the foreign id of the associated node as the system ID.


When you specify a system ID, also set the location to the corresponding location for that system.

Use placeholders in parameters

Some monitor parameters support placeholder substitution. You can reference some node, interface, and asset record properties by enclosing them in { and }. The supported properties are:

  • nodeId

  • nodeLabel

  • foreignSource

  • foreignId

  • ipAddr (or ipAddress)

  • all node asset record fields (for example: username, password)

Parameters that support placeholder substitution have a {} icon beside them in the Configuration and use section of the monitor documentation.