currently each poller uses it's own cache for dynamic snmp index entries. ZBX-5973 improved performance of this process, but also adds all possible values in all copies of this cache.

in a case of a larger zabbix system with, let's say, 100 pollers, that's 100 times bigger memory usage for this cache and 100 times more snmp queries.

it would be great to have a single cache for all pollers instead