Monitoring WebLogic Server 12c - Oracle WebLogic Server 12c Advanced Administration - page 164

4. In the Summary of Diagnostic Modules page, click on the New button.
5. Type EmailAlertModule in the Name field and click on the OK button.
6. Click on the newly created EmailAlertModule WLDF module and then on
the Targets tab. Select the All servers in the cluster radio button and click on
the Save button.
7. Click on the Configuration tab and then the Collected Metrics tab. Change the
Sampling Period value to 60000 and click on the Save Button.
8. Click on the New button in the Collected Metrics in this Module table to create
a new Harvester.
9. Choose ServerRuntime from the MBean Server location drop-down menu and
click on the Next button.
10. Select weblogic.management.runtime.ThreadPoolRuntimeMBean from the
MBean Type drop-down menu and click on the Next button.
11. Select the QueueLength item from the Collected Attributes table on the
left and click on the > icon to move it to the Chosen table on the right. Click on the
Next button.
12. In the Select Instances page, leave the Chosen Collected Instances and Instance
Expressions textboxes empty and then click on the Finish button.