Enrol_Synch enrolment method:
The “Automated enrolments” enrolment method depends on tool_synch. If it is enabled at system level, it will report the enrolments fed by tool_synch in the courses, so as to distinguish them from manual enrolments. If the method is not enabled at system level, the enrolments will be shown as manual enrolments. This method is instantiated automatically in courses, and can be disabled at course level.