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The requirement has been covered in the latest checkin to
Subversion: all logging calls take an extra optional keyword
parameter called "extra" which is meant to be a dictionary
containing additional attributes to add to the LogRecord. See

http://docs.python.org/dev/lib/module-logging.html

The dictionary should not contain keys which class with
"built-in" attributes of the LogRecord.

N.B. Off-topic: The LogRecord also now contains the name of
the function from which the logging call was made - in the
funcName attribute.