Man pages matching name cache::ref::util::lru::api in section 3pm:

Cache::Ref::Util::LRU::API.3pm.en	debian 10 / libcache-ref-perl
Cache::Ref::Util::LRU::API.3pm.en	debian 11 / libcache-ref-perl
Cache::Ref::Util::LRU::API.3pm.en	debian 12 / libcache-ref-perl