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How to Install Icinga2 on RHEL, Rocky and AlmaLinux

Icinga2 is a feature-rich open-source network monitoring and alerting application that is a fork of the Nagios monitoring tool. It was built to address the shortcomings of Nagios and introduce new features such as an improved and modern user interface, a REST API for integrating new extensions without the need for making changes to the Icinga core, and additional database connectors.