This file is indexed.

/lib/udev/rules.d/80-mm-candidate.rules is in modemmanager 1.6.8-2ubuntu1.

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 edit this file, it will be overwritten on update

# Tag any devices that MM might be interested in; if ModemManager is started
# up right after udev, when MM explicitly requests devices on startup it may
# get devices that haven't had all rules run yet.  Thus, we tag devices we're
# interested in and when handling devices during MM startup we ignore any
# that don't have this tag.  MM will still get the udev 'add' event for the
# device a short while later and then process it as normal.

ACTION!="add|change|move", GOTO="mm_candidate_end"

# Opening bound but disconnected Bluetooth RFCOMM ttys would initiate the
# connection. Don't do that.
KERNEL=="rfcomm[0-9]*", DEVPATH=="*/virtual/*", GOTO="mm_candidate_end"

SUBSYSTEM=="tty", ENV{ID_MM_CANDIDATE}="1"
SUBSYSTEM=="net", ENV{ID_MM_CANDIDATE}="1"
KERNEL=="cdc-wdm*", SUBSYSTEM=="usb", ENV{ID_MM_CANDIDATE}="1"
KERNEL=="cdc-wdm*", SUBSYSTEM=="usbmisc", ENV{ID_MM_CANDIDATE}="1"

LABEL="mm_candidate_end"