Use 'FNDIM%'. It normally has the node name appended to FNDIM. It is not activated in any of my 11i to 12.2 instances, including 12.1.3 instances. From what I can tell, the Internal Monitor is primarily used with PCP.
How to Activate Parallel Concurrent Processing - Background Facts and Setup Steps (Doc ID 602899.1)
Internal monitor is by default not activated in any EBS versions. This is required only if you need to setup Parallel Concurrent Processing(PCP) and needs to enabled explicitly by navigating to Concurrent -> Managers -> Define -> Search for 'Internal Monitor' and then check the activate button.
Please check workshift is defined. if not choose "Standard" and save it.
SYSADMIN > Concurrent > Manager > Define > query FNDIMON > workshift
Hope this helps!