Udm_manager queue was backing up and no longer draining. The udm_manager probe has no errors.
This was due to an improperly removed Trellis service. Trellis was failing to load properly causing issues with udm_manager.
Release: CNMSPP99000-8.5-Unified Infrastructure Mgmt-Server Pack-- On Prem
Please follow article TEC1486602 to properly remove Trellis services.