Notification Scripts: HOSTNOTES, SERVICENOTES empty

[Yggy]

I think you’re looking for this answer:

RAW: How do I add a description for a host added to monitoring?

Oh my young padawan, this is a name I have not heard for a very long time. Host and service notes are created from files in $OMD_ROOT/etc/check_mk/notes/hosts and $OMD_ROOT/etc/check_mk/notes/services. The filename have to match the hostname or service description. The content will then be displayed in that field. This is a very undocumented feature of checkmk.

That post also talks about some inconsistencies regarding custom host & service notes / urls / action / gui.