Man pages matching name anyevent::xmpp::error::stanza in section 3pm:

AnyEvent::XMPP::Error::Stanza.3pm.en	debian 10 / libanyevent-xmpp-perl
AnyEvent::XMPP::Error::Stanza.3pm.en	debian 11 / libanyevent-xmpp-perl
AnyEvent::XMPP::Error::Stanza.3pm.en	debian 12 / libanyevent-xmpp-perl