Painful is right. I'm not sure the effort is worth the result--the jury is still out on that one. It does appear that you can have more than one thing in Group

Group => [Host,File,Hour]; as long as you have a report type declared for each item as such:

$log->report(Group => File, Sort => Records);
$log->report(Group => Host, Sort => Bytes);
$log->report(Group => Hour, List => [Bytes, Records];
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For some reason, I didn't find the documentation to be entirely clear about that point.