Zabbix agent item 'system.swap.size[,pfree]' mays show wrong value on virtualized Windows hosts (VMWare, Hyper-V etc). Behavior is documented:**

https://www.zabbix.com/documentation/4.4/manual/config/items/itemtypes/zabbix_agent

Note that this key might report incorrect swap space size/percentage on virtualized (VMware ESXi, VirtualBox) Windows platforms. In this case you may use the perf_counter[\700(_Total)\702] key to obtain correct swap space percentage.

So, maybe we should use performance counter in the template instead of system.swap.size item?

In my case I've just replace it to 'perf_counter_en["\Paging file(_Total)\ % Usage"]' and change trigger expression as showing below:

E.g. I have VM shv-vexch03 where performance counter returns ~8% page file usage and system.swap.size[,*pfree*] which returns 66% usage (100 - system.swap.size[,pfree]):