This file is indexed.

/lib/udev/rules.d/84-nm-drivers.rules is in network-manager 1.10.6-2ubuntu1.

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

The actual contents of the file can be viewed below.

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# Do not modify this file, it will get overwritten on updates.
# To override or extend the rules place a file in /etc/udev/rules.d

SUBSYSTEM!="net", GOTO="nm_drivers_end"
ACTION!="add|change", GOTO="nm_drivers_end"

# Determine ID_NET_DRIVER if there's no ID_NET_DRIVER or DRIVERS (old udev?)
ENV{ID_NET_DRIVER}=="?*", GOTO="nm_drivers_end"
DRIVERS=="?*", GOTO="nm_drivers_end"
PROGRAM="/bin/sh -c 'ethtool -i $1 | sed -n s/^driver:\ //p' -- $env{INTERFACE}", RESULT=="?*", ENV{ID_NET_DRIVER}="%c"

LABEL="nm_drivers_end"