The following description should also include the browser poller:

===
zabbix[process,<type>,<mode>,<state>]

The percentage of time a particular Zabbix process or a group of processes (identified by <type> and <mode>) spent in <state>. It is calculated for the last minute only. Specifying <type> is mandatory.
Return value: Float.

Parameters:

type - for server processes: agent poller, alert manager, alert syncer, alerter, availability manager, configuration syncer, configuration syncer worker, connector manager, connector worker, discovery manager, discovery worker, escalator, ha manager (since Zabbix 7.0.5), history poller, history syncer, housekeeper, http agent poller, http poller, icmp pinger, ipmi manager, ipmi poller, java poller, lld manager, lld worker, odbc poller, poller, preprocessing manager, preprocessing worker, proxy group manager, proxy poller, self-monitoring, service manager, snmp poller, snmp trapper, task manager, timer, trapper, trigger housekeeper, unreachable poller, vmware collector;
for proxy processes: agent poller, availability manager, configuration syncer, data sender, discovery manager, discovery worker, history syncer, housekeeper, http agent poller, http poller, icmp pinger, ipmi manager, ipmi poller, java poller, odbc poller, poller, preprocessing manager, preprocessing worker, self-monitoring, snmp poller, snmp trapper, task manager, trapper, unreachable poller, vmware collector;

https://www.zabbix.com/documentation/7.0/en/manual/config/items/itemtypes/internal