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# Create diagnostic system modules

A diagnostic module is a software component that you configure to monitor an aspect of a server or server resource. You can configure multiple system modules to monitor different aspects of a server, but only one such module can be active on a server.

Note: You can also create diagnostic application modules for monitoring applications running on Weblogic servers. However, you can only configure diagnostic system modules through the Administration Console.

To create a diagnostic module:

1. If you have not already done so, in the Change Center of the Administration Console, click Lock & Edit (see Use the Change Center).
2. In the left pane, expand Diagnostics and select Diagnostic Modules.
3. On the Summary of Diagnostic Modules page, click New.
4. On the Create a Diagnostics System Module page, enter a name for the module and, optionally, enter a description. Then click OK. The name of the new diagnostic module is added to the Diagnostic Modules table on the Summary of Diagnostic Modules page.
5. On the Summary of Diagnostic Modules page, click the name of the new module.
6. On the Settings for [Module Name] page, set configuration options for the module:
   - To configure metrics, select Configuration > Collected Metrics. For more instructions, see Configure metric collection for a diagnostic system module
   - To configure watches and notifications, select Configuration > Watches and Notifications. For more instructions, see Configure watches and notifications
   - To configure instrumentation, select Configuration > Instrumentation. For more instructions, see Configure instrumentation for a diagnostic module
7. To target the module to a server or cluster, select Targets. For more instructions, see Target and untarget diagnostic system modules .
8. To activate these changes, in the Change Center of the Administration Console, click Activate Changes.
   Not all changes take effect immediately—some require a restart (see Use the Change Center).