At this point, we have seen how basic notifications work, starting from the service check, to contact, to command. We saw how to restrict notifications to be sent only at a certain time, how to send a specific type of notifications. We also saw how to configure various contacts to receive notifications if a long duration outage occurs without manual intervention from people already troubleshooting the issue and relevant people need to be notified. A more comprehensive and minutely detailed explanation of various directives can be found in Icinga's official object definition documentation.

In the next chapter, we look into how we can extend Icinga with custom plugins and leverage its flexibility to suit our customization requirements.