enque/logging is a SAP Parameter attribute which is used to control Switch enqueue logging on/off information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter is used to activate and deactivate enqueue logging (same
function as SM12: Diagnosis -> Logging -> On / Off).
See SAP Parameter Documentation for full SAP documentation for this profile parameter.