/usr/share/metview/etc/RttovRunRules 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 | %if RTTOV_SENSOR <> CUSTOM %then
%unset RTTOV_CHANNELS
%unset RTTOV_CHANNELS_PATH
%unset RTTOV_COEFFICIENTS
%unset RTTOV_COEFFICIENTS_PATH
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