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/usr/share/check_mk/notifications/README is in check-mk-server 1.2.6p12-1.

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Put your custom notification scripts here. All executable files will be read in.
If you want your scripts to have user readable aliasses then put those into
a comment into the second line, e.g.:

#!/usr/bin/foolang
# Notify via Loudspeaker
...

You script retrieves all neccessary information about the actual notification
in environment variables beginning with NOTIFY_.