Man pages matching name config::model::itself::backenddetector in section 3pm:

Config::Model::Itself::BackendDetector.3pm.en	debian 10 / libconfig-model-itself-perl
Config::Model::Itself::BackendDetector.3pm.en	debian 11 / libconfig-model-itself-perl
Config::Model::Itself::BackendDetector.3pm.en	debian 12 / libconfig-model-itself-perl