We are currently using Oracle10g 10.2.0.3 OEM DBcontrol. I am not seeing the Userdefined Metrics under Available Metrics selection box while defining Notification Rule.
click on your DB in EM. that will take you to db homepage.
below you will find link for UDM's. udms are the ones for which you need to run your own scripts.
Are you the OEM db control on unix - linux or windows
There is a xml file that containts the UDM metrics , is located
but this is for oem grid control. For db control i dont know that exists this file
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