Man pages matching name memcached::libmemcached::memcached_pool in section 3pm:

Memcached::libmemcached::memcached_pool.3pm.en	debian 10 / libmemcached-libmemcached-perl
Memcached::libmemcached::memcached_pool.3pm.en	debian 11 / libmemcached-libmemcached-perl
Memcached::libmemcached::memcached_pool.3pm.en	debian 12 / libmemcached-libmemcached-perl