This file is indexed.

/usr/share/nav_msgs/msg/MapMetaData.msg is in ros-nav-msgs 1.12.5-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# This hold basic information about the characterists of the OccupancyGrid

# The time at which the map was loaded
time map_load_time
# The map resolution [m/cell]
float32 resolution
# Map width [cells]
uint32 width
# Map height [cells]
uint32 height
# The origin of the map [m, m, rad].  This is the real-world pose of the
# cell (0,0) in the map.
geometry_msgs/Pose origin