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# Diagnostic Modules: Create a Metric

Configuration Options Related Tasks

Use this set of pages to create a single metric for the current system module. Each metric represents data from one or more attributes of a specified MBean type. The metric can collect data from all instances of the MBean type or from specified instances of the type.

To configure all options for the metric, you must set options on the first page, click Next to navigate to the next page, set the option on that page, etc. When finished, click Finish to save the configuration.

### Step 1

On the Create a Metric: Metric Collection properties page, select a type of MBean from which you want to collect diagnostic data.

### Step 2

On the Create a Metric: Additional Metric Collection Properties page, select the attributes you want to track for the MBean you chose on the Metric Collection properties page (step 1, above). If you don't select any individual attributes here, diagnostic data for all attributes on the MBean will be collected.

### Step 3

On the Create a Metric: Select Instances page, select the instances of the MBean you want to track. If you don't select any individual MBean instances here, diagnostic data for all the instances of the MBean type will be collected, including instances which are created in the future.

#### Configuration Options

Name | Description
--- | ---
MBean Type | The MBean type for which metrics are to be collected. MBean Attribute: `WLDFHarvesterBean.HarvestedTypes`
Collected Attributes | The harvested attributes for this type. If a list of attributes is provided, only those attributes are harvested; otherwise all harvestable attributes are harvested. MBean Attribute: `WLDFHarvestedTypeBean.HarvestedAttributes`
Collected Instances | The instances of the selected MBean for which metrics are to be collected. 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