Man pages matching name net::amqp::frame::heartbeat in section 3pm:

Net::AMQP::Frame::Heartbeat.3pm.en	debian 10 / libnet-amqp-perl
Net::AMQP::Frame::Heartbeat.3pm.en	debian 11 / libnet-amqp-perl
Net::AMQP::Frame::Heartbeat.3pm.en	debian 12 / libnet-amqp-perl