/usr/share/metview/etc/MacroRules is in metview-data 5.0.0~beta.1-1build1.
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
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