prerm is in rsyslog-mysql 8.16.0-1ubuntu3.
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 | #!/bin/sh
set -e
. /usr/share/debconf/confmodule
. /usr/share/dbconfig-common/dpkg/prerm.mysql
dbc_go rsyslog-mysql $@
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