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Nagios XI is the easy-to-use, enterprise version of Nagios that features:
One of the reasons that Nagios is such a popular monitoring application is the fact that it can be easily integrated in your existing infrastructure. There are several methods of integrating Nagios with the management software you're already using and you can monitor almost any type of new or custom hardware, service, or application that you might have.
To monitor new hardware, services, or applications, check out the docs on:
To get data into Nagios from external applications, check out the docs on:
To send status, performance, or notification information from Nagios to external applications, check out the docs on:
I've documented some examples on how to integrate Nagios with external applications: