https://bestmonitoringtools.com/how-to-install-zabbix-server-on-ubuntu/…;
https://ixnfo.com/en/solving-the-zabbix-problem-icmp-pinger-processes-m…;
https://www.sherbers.de/pagespeed-insights-automation-with-zabbix/
https://grafana.com/docs/grafana/latest/installation/debian/
http://yallalabs.com/linux/how-to-install-zabbix-server-4-on-centos-7-rhel-7/
http://yallalabs.com/linux/how-to-install-zabbix-agent-on-ubuntu-16-04-lts/
https://www.zabbix.com/documentation/current/manual/xml_export_import/media?s[]=slack
https://bestmonitoringtools.com/create-zabbix-maps-with-examples/
http://ashoktutorials.blogspot.com/2017/06/how-to-remove-zabbix-agent-from-ubuntu.html