How one should interpret those results?

I guess those are the GLOBALs that live in the STASH / Symbol table ... so $FOO::BAR and sub FOO::BAR and %FOO::BAR and open FOO::BAR... and @FOO::BAR ... perldata#Typeglobs and Filehandles

linked it for you :) Bug #89921 for Devel-Gladiator: a better description of how to interpret report results

Have you seen Test::LeakTrace? it also scans arenas, :)

Then there is also the old standby Devel::Leak ...