/usr/share/doc/liblog-log4perl-perl/examples/dupe-warning.conf is in liblog-log4perl-perl 1.44-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | log4perl.category = WARN, Logfile
log4perl.appender.Logfile = Log::Log4perl::Appender::File
log4perl.appender.Logfile.filename = test.log
log4perl.appender.Logfile.layout = Log::Log4perl::Layout::PatternLayout
log4perl.appender.Logfile.layout.ConversionPattern = %d %F{1} %L> %m %n
log4perl.category = TRACE, Logfile
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