You really, really, REALLY need to open a PMR with IBM on OMEGAMON XE configuration. I found this in the OMEGAMON XE for z/os Planning and Configuration Guide
OMEGAMON XE on z/OS monitoring agents installed on monitored z/OS LPARs (logical partitions) provide comprehensive usage information for Sysplex-level resources such as coupling facilities, global enqueues, global resource serialization (GRS) ring systems, shared DASD groups, and cross-system coupling facilities (XCFs), as well as performance information for the service classes, report classes, and resource groups that use those resources.
But I also found
When you configure each monitoring agent, you have the option of defining its runtime environment as single LPAR environment or as a Sysplex environment. If you define it as a Sysplex environment, you must assign it to a defined Sysplex. Data from each runtime environment in a Sysplex is pooled at the primary Sysplex proxy (see Designating the Sysplex proxy).
So it sounds like a monitoring agent can be running on your LPAR. How to install and configure that monitoring agent will be in the manual -- so at a minimum you need to start on page 1 of the Planning and Configuration Guide
manual and read until you can install the product on your LPAR or you determine that what you want to do is not possible. If the product is already installed, it may need to be removed and reinstalled.