Viewing and interpreting notification history
In this recipe, we'll see how to get both complete listings and convenient summaries of the alerts and notifications being generated by Nagios Core in response to hosts and services changing state. These options are all available under the Reports section of the sidebar:
It's important to distinguish between alerts and notifications in this section. An alert is generated in response to an event such as a host or service changing state. A notification, in turn, may or may not be generated as a response to that alert and can be sent to the appropriate contacts. The SOFT state changes constitute alerts; only HARD state changes generally generate notifications.
It's likely that a production monitoring server will not send notifications for every alert, particularly if you're making good use of the max_check_attempts, scheduled downtime, and problem acknowledgement features. So, you should make sure you're checking the correct section.
