Man pages matching name postscript::file::metrics::loader in section 3pm:

PostScript::File::Metrics::Loader.3pm.en	debian 10 / libpostscript-file-perl
PostScript::File::Metrics::Loader.3pm.en	debian 11 / libpostscript-file-perl
PostScript::File::Metrics::Loader.3pm.en	debian 12 / libpostscript-file-perl