Man pages matching name file::changenotify::watcher::default in section 3pm:

File::ChangeNotify::Watcher::Default.3pm.en	debian 10 / libfile-changenotify-perl
File::ChangeNotify::Watcher::Default.3pm.en	debian 11 / libfile-changenotify-perl
File::ChangeNotify::Watcher::Default.3pm.en	debian 12 / libfile-changenotify-perl