postrm is in icinga-common 1.13.3-2.
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 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | #!/bin/sh -e
# some shorthands for sanity
en="/etc/icinga"
enc="/etc/icinga/objetcs"
usn="/usr/share/icinga"
case "$1" in
  remove)
  	;;
  purge)
        for file in $en/resource.cfg /var/log/icinga /var/run/icinga \
	            /var/lib/icinga /var/lib/icinga/spool \
		    /var/lib/icinga/spool/checkresults \
		    /var/cache/icinga /var/lib/icinga/rw; do
	    dpkg-statoverride --force --remove $file 2>/dev/null || true
	done
        rm -rf /var/run/icinga /var/log/icinga /var/lib/icinga \
	       /var/cache/icinga
    ;;
esac
# Automatically added by dh_installdebconf
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
# Automatically added by dh_installinit
if [ "$1" = "purge" ] ; then
	update-rc.d icinga remove >/dev/null
fi
# In case this system is running systemd, we make systemd reload the unit files
# to pick up changes.
if [ -d /run/systemd/system ] ; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
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