This file is indexed.

/etc/freeradius/3.0/sites-available/coa is in freeradius-config 3.0.16+dfsg-1ubuntu3.

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

The actual contents of the file can be viewed below.

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# -*- text -*-
######################################################################
#
#  Sample virtual server for receiving a CoA or Disconnect-Request packet.
#

#  Listen on the CoA port.
#
#  This uses the normal set of clients, with the same secret as for
#  authentication and accounting.
#
listen {
	type = coa
	ipaddr = *
	port = 3799
	virtual_server = coa
}

server coa {
	#  When a packet is received, it is processed through the
	#  recv-coa section.  This applies to *both* CoA-Request and
	#  Disconnect-Request packets.
	recv-coa {
		#  CoA && Disconnect packets can be proxied in the same
		#  way as authentication or accounting packets.
		#  Just set Proxy-To-Realm, or Home-Server-Pool, and the
		#  packets will be proxied.

		#  Do proxying based on realms here.  You don't need
		#  "IPASS" or "ntdomain", as the proxying is based on
		#  the Operator-Name attribute.  It contains the realm,
		#  and ONLY the realm (prefixed by a '1')
		suffix

		#  Insert your own policies here.
		ok
	}

	#  When a packet is sent, it is processed through the
	#  send-coa section.  This applies to *both* CoA-Request and
	#  Disconnect-Request packets.
	send-coa {
		#  Sample module.
		ok
	}

	#  You can use pre-proxy and post-proxy sections here, too.
	#  They will be processed for sending && receiving proxy packets.
}