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# Diagnostic Modules: Metric Configuration: Instances

Configuration Options Related Tasks

Use this page to specify the instance(s) of an MBean type from which to collect metrics. If you don't select any specific instances, metrics from all available instances of that type will be collected.

#### Configuration Options

Name | Description
--- | ---
Metric Type | The list of MBeans representing the harvested types. MBean Attribute: `WLDFHarvesterBean.HarvestedTypes`
Collected Instances | The harvested instances of this type. The configuration of a type can optionally provide a set of identifiers for specific instances. If this list is provided, only the provided instances are harvested; otherwise all instances of the type are harvested. The identifier for an instance is the JMX ObjectName in canonical form. MBean Attribute: `WLDFHarvestedTypeBean.HarvestedInstances`

Related Tasks

- Configure instrumentation for a diagnostic module
- Configure metric collection for a diagnostic system module
- Configure metrics to collect in a diagnostic system module