As stated on the Github repository, the plugin simply “emits events from the Moodle Logstore as xAPI statements”. For those that don’t know, the Moodle Logstore is a log of activities in Moodle. When you view a course, complete a quiz, or grade a student a log of that activity is recorded in the Logstore. The plugin uses these logs to produce xAPI statements and then sends (emits) them to an LRS that you can configure.

מקור: Learning Locker – the open source learning record store (LRS) – Say hello to our little plugin