postrm is in ceilometer-collector 2014.1.2-0ubuntu1.1.
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 | #!/bin/sh -e
if [ "$1" = purge ]; then
update-rc.d ceilometer-collector remove
fi
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