example of logging w/ user-defined keywords?

[Chris Curvey]

Several things that I've read lead me to think this is possible, but I
can't figure out how to do it.  I have some information (a "job
number")  that I would like logged on every log message, just like the
time or the severity.

I saw some mail threads that suggested that there was an easy way to do
this, but I havent' found any examples.  Is there a simple way to do
this, or do I need to write my own logger subclass?