This extension adds support for the Icinga 2 configuration language to Visual Studio Code.
Unfortunately the Icinga developers of have chosen to use the .conf file exension for
their language, and given that this extension is extremely common for many different
types of files, I cannot assume all .conf files are Icinga 2 configuration files.
I recommend using another extension like modelines and adding a modeline like this to the bottom of all of your configuration files.
// -*- mode: icinga -*-