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