/usr/share/metview/etc/MacroRules is in metview-data 4.8.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 | %if %not _SERVICE %then 
	%set _SERVICE = 'macro'
%if PRETTY_PRINTING = OFF %then
	%unset ORIENTATION
	%unset COLUMNS
	%unset MARGIN
	%unset FONT_SIZE
	%unset TAB_SIZE
 |