Bruno Polaco commented on New Feature LOGBACK-778
You can find the specification for the tag in the appendix of the syslog RFC, page 34 http://tools.ietf.org/html/rfc5424
Being more pratical, the tag is used because facilities are limited (as they are quite old). See the section 'Facilities' on the following page: http://www.linode.com/wiki/index.php/Syslog_Howto
In rsyslog, the tag is referenced as syslogtag: http://linux.die.net/man/5/rsyslog.conf

In summary, tags are just the first word in each message and can be used to identify the message type :)

I will take a look into the html and maybe do a pull request myself
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