Man pages matching name devel::caller::ignorenamespaces in section 3pm:

Devel::Caller::IgnoreNamespaces.3pm.en	debian 10 / libdevel-caller-ignorenamespaces-perl
Devel::Caller::IgnoreNamespaces.3pm.en	debian 11 / libdevel-caller-ignorenamespaces-perl
Devel::Caller::IgnoreNamespaces.3pm.en	debian 12 / libdevel-caller-ignorenamespaces-perl