Your priority values are hashes. So how do you want to compare {'IS-ABC' => '3'} with {'IS-XYZ' => '3'}? Do you compare IS-ABC with IS-XYZ alphabetically, and what if they are equal?
From your desired output here's something that I think will work:
sub sortBySite {
my ($site_a) = keys %{$tmp{$a}{'priority'}};
my ($site_b) = keys %{$tmp{$b}{'priority'}};
return $site_a cmp $site_b;
}
Also, does your data really need to be stored as a HoH? Would this simpler structure work for you?
'hostX1-1-l.example.com' => {
priority => 'IS-ABC',
priority_level => 3,
os => 'linux',
pager => 'man-duty',
}
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