/usr/lib/mon/alert.d/test.alert is in mon 1.2.0-9+nmu4.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh
#
# $Id: test.alert,v 1.1.1.1 2004/06/09 05:18:07 trockij Exp $
echo "`date` $*" >> /var/log/mon/test.alert.log
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