Where is the apper/packagekit log?

[Jonathan Ryshpan]

Where does packageKit, which is (I assume) invoked by the KDE apper
program, keep its log.  The log can be viewed in apper, but I would
like to have it in text form, so I can edit and search it.    The
Fedora "User Guide - Managing Software" claims "Every completed
transaction records the affected packages in the log file /var/log/dnf.
log", but I can't find any records of updated packages there.

Thanks - jon
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