Pfsense syslog catagories

[markn62]

Anyone know how PfSense classifies syslog messages within the Priority catagory?  I have Kiwi receiving PfSense logs.  I find some errors seem mis-catagorized.  For example, logging out of PfSense results in a "User.Error".  Why should logging out properly be the cause for an error message.  User.Info I could understand as an appropriate catagory.  Might these be editble or are they hard coded following some syslog messaging standard?

Thanks.