Found this in the log today:
Can't locate Getopt/Long/Parser.pm in @INC (you may need to install the Getopt::Long::Parser module) (@INC entries checked: /usr/share/logwatch/lib /usr/lib/perl5/site_perl/5.42.2/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.42.2 /usr/lib/perl5/5.42.2/x86_64-linux-thread-multi /usr/lib/perl5/5.42.2) at /usr/lib/perl5/5.42.2/Getopt/Long.pm line 144.