Man pages matching name moosex::app::message::envelope in section 3pm:

MooseX::App::Message::Envelope.3pm.en	debian 10 / libmoosex-app-perl
MooseX::App::Message::Envelope.3pm.en	debian 11 / libmoosex-app-perl
MooseX::App::Message::Envelope.3pm.en	debian 12 / libmoosex-app-perl