Proxy monitor net.tcp.service

[tequila]

Zabbix version 4.2. Configured simple check of net.tcp.service under proxy host items to monitor TCP ports.

1. Why the monitor through zabbix server (check the tcpdump for server & proxy, the corresponding IP address only appear in server)? Is it a normal situation?
2. How to setup the global trigger alert instead of each item? Because configure net.tcp.service over 100 items.

e.g. Individual configure by item:
{zabproxy01:net.tcp.service[tcp,192.168.0.100,80].last()}=0
{zabproxy01:net.tcp.service[tcp,192.168.0.101,80].last()}=0
{zabproxy01:net.tcp.service[tcp,192.168.0.102,80].last()}=0
{zabproxy01:net.tcp.service[tcp,192.168.0.103,80].last()}=0
{zabproxy01:net.tcp.service[tcp,192.168.0.104,80].last()}=0
{zabproxy01:net.tcp.service[tcp,192.168.0.105,80].last()}=0
{zabproxy01:net.tcp.service[tcp,192.168.0.106,80].last()}=0
{zabproxy01:net.tcp.service[tcp,192.168.0.100,443].last()}=0
{zabproxy01:net.tcp.service[tcp,192.168.0.101,443].last()}=0
{zabproxy01:net.tcp.service[tcp,192.168.0.102,443].last()}=0
{zabproxy01:net.tcp.service[tcp,192.168.0.103,443].last()}=0
{zabproxy01:net.tcp.service[tcp,192.168.0.104,443].last()}=0
{zabproxy01:net.tcp.service[tcp,192.168.0.105,443].last()}=0
{zabproxy01:net.tcp.service[tcp,192.168.0.106,443].last()}=0


Reference:
https://www.zabbix.com/documentation..._by_location?s[]=host.name

Thanks.