The previous chapter provided information about monitoring Microsoft Windows machines and several approaches to more advanced monitoring using Nagios.
One of the key features of Nagios is its extensibility. There are multiple ways in which Nagios can be tailored to suit your needs. This chapter focuses on extending Nagios functionality using code written by yourself. It is possible to integrate Nagios tightly with your applications and benefit from a powerful mechanism for scheduling and performing checks.
You will learn how to perform both active and passive checks, send custom notifications to users on behalf of Nagios, access Nagios status information, and manage it.
Nagios 4 provides an interface called query handler ...