You would like to find the associated severities for all Data Loss Prevention (DLP) Enforce console System Event Codes.
Enforce console System Event Codes and descriptions are contained in the Data Loss Prevention Administration Guide, or the Online Help (15.7 Link).
Click on "Help" button, and search for "System event codes and messages".
However, these sources do not list the associated severities with the Event Codes (i.e., severe, warning, info).
Attached to this article is a spreadsheet with most of the severities listed - updated as of 15.7.