Man pages matching name moose::cookbook::extending::extensionoverview in section 3pm:

Moose::Cookbook::Extending::ExtensionOverview.3pm.en	debian 10 / libmoose-perl
Moose::Cookbook::Extending::ExtensionOverview.3pm.en	debian 11 / libmoose-perl
Moose::Cookbook::Extending::ExtensionOverview.3pm.en	debian 12 / libmoose-perl