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For every DataSource applied to a device, LogicMonitor attempts to discover one or more instances to monitor. (For more information on how DataSources get applied to devices, see How DataSources Get Applied to Resources.)
Some DataSources will only ever have one instance to monitor per device (e.g. ping), while others may identify multiple instances (e.g. disks, server volumes, interfaces, etc.) to monitor per device.
For single-instance DataSources, the instance is automatically added and data collection begins immediately. For multi-instance DataSources, instances can be automatically added into monitoring via LogicMonitor’s Active Discovery process, or they can be manually added into monitoring. In the following sections, we’ll discuss both of these methods.
Active Discovery is automatically run for multi-instance DataSources that have it enabled. It is a process by which LogicMonitor determines all of the similar components of a particular type on a given system. For each component “discovered”, an instance is created and data is collected for that instance. For a detailed discussion of LogicMonitor’s Active Discovery process, see Active Discovery.
Active Discovery typically runs on a schedule that is configured from the DataSource definition. However, there may be situations in which you do not want to wait for the next scheduled execution of Active Discovery in order to add an instance into monitoring. In these situations, Active Discovery can be manually initiated.
Before manually initiating Active Discovery, ensure the DataSource and/or instance are not disabled at the group level as this will prevent instances from being added into monitoring.
To manually initiate Active Discovery, follow these steps:
All multi-instance DataSources that are applied to the device and have Active Discovery enabled will execute the Active Discovery process.
Note: The act of manually initiating Active Discovery for a resource also causes the reevaluation of all PropertySources and DataSources in your account in terms of their application to the current resource, as discussed in Creating PropertySources and How DataSources Get Applied to Resources respectively. In addition, LogicMonitor will perform a basic system information discovery check, as discussed in Resource and Instance Properties.
Multi-instance DataSources that do not have Active Discovery enabled require that instances be added manually. An example of a multi-instance DataSource for which it may be appropriate to not enable Active Discovery is one that applies to an application that runs on a different port per device, and the list of ports is not exclusive to the application. In this case, it may be most efficient to manually add an instance of the application, specifying the port.
To manually add an instance into monitoring, follow these steps:
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