This file is indexed.

/usr/share/visualization_msgs/msg/InteractiveMarker.msg is in ros-visualization-msgs 1.12.5-2.

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

The actual contents of the file can be viewed below.

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# Time/frame info.
# If header.time is set to 0, the marker will be retransformed into
# its frame on each timestep. You will receive the pose feedback
# in the same frame.
# Otherwise, you might receive feedback in a different frame.
# For rviz, this will be the current 'fixed frame' set by the user.
Header header

# Initial pose. Also, defines the pivot point for rotations.
geometry_msgs/Pose pose

# Identifying string. Must be globally unique in
# the topic that this message is sent through.
string name

# Short description (< 40 characters).
string description

# Scale to be used for default controls (default=1).
float32 scale

# All menu and submenu entries associated with this marker.
MenuEntry[] menu_entries

# List of controls displayed for this marker.
InteractiveMarkerControl[] controls