This file is indexed.

/etc/asterisk/dnsmgr.conf is in asterisk-config 1:11.7.0~dfsg-1ubuntu1.

This file is owned by root:root, with mode 0o640.

The actual contents of the file can be viewed below.

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[general]
;enable=yes		; enable creation of managed DNS lookups
			;   default is 'no'
;refreshinterval=1200	; refresh managed DNS lookups every <n> seconds
			;   default is 300 (5 minutes)