Sorted:

How does Nagios handle the scheduling of monitoring tasks?

How does Nagios handle different types of monitoring alerts?

Does Nagios support distributed monitoring?

What is the flapping state of Nagios?

How to set up alarm thresholds in Nagios?

How to set thresholds for monitoring items in Zabbix?

What is the purpose of Screens in Zabbix?

How to configure SNMP monitoring in Zabbix?

What is the purpose of Discovery rules in Zabbix?

How to import and export configuration data in Zabbix?