Man pages matching name monitoring::plugin::getopt in section 3pm:

Monitoring::Plugin::Getopt.3pm.en	debian 10 / libmonitoring-plugin-perl
Monitoring::Plugin::Getopt.3pm.en	debian 11 / libmonitoring-plugin-perl
Monitoring::Plugin::Getopt.3pm.en	debian 12 / libmonitoring-plugin-perl