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Delayed service notifications in Icinga2

Icinga2 is used for monitoring my infrastructure. Some services are more noisy than others, and generate a lot of unnecessary warnings in a short time. A delayed notification rule is used to only raise alarms when the service is not OK for a prolonged period of time.

Icinga Director and disk checks for fuse mountpoints

When I rolled out my new Icinga2 installation, and added disk checks for all laptops, I ran into a small problem: there is a fuse mountpoint for logged in users which only the user can read. Apparently it has something to do with Flatpack.

How to configure notifications in Icinga2 Director

I'm using Icinga2 for a long time, but recently installed a new system and using Director for the first time. I know how to configure notifications in Icinga2 config files, but getting them working in Director (with Director options only) is a bit of a challenge. Here is a step-by-step to get simple mail notifications working. From there it should be easier to configure more advanced notifications.