Zabbix icmp pinger processes more than 75% busy

The answer from Mick's comment:

Problem: Zabbix proxy poller processes more than 75% busy

Solution: In zabbix_server.conf

StartPollers=20

Problem: Zabbix icmp pinger processes more than 75% busy

Solution: In zabbix_server.conf

StartPingers=10 StartDiscoverers=10

Problem: Zabbix unreachable poller processes more than 75% busy

Solution: In zabbix_server.conf

StartPollersUnreachable=10