postinst is in groonga-munin-plugins 6.0.1-1ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25  | #! /bin/sh
set -e
prevver="$2"
init_plugins() {
	munin-node-configure --shell --remove-also | \
		grep -e 'groonga_' | \
		sh
	invoke-rc.d munin-node restart
}
case "$1" in
        configure)
		init_plugins
                ;;
        abort-upgrade|abort-deconfigure|abort-remove)
                :
                ;;
        *)
                echo "Called with unknown argument $1, bailing out."
                exit 1
                ;;
esac
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