/etc/cloud/templates/resolv.conf.tmpl is in cloud-init 0.7.5-0ubuntu1.18.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Your system has been configured with 'manage-resolv-conf' set to true.
# As a result, cloud-init has written this file with configuration data
# that it has been provided. Cloud-init, by default, will write this file
# a single time (PER_ONCE).
#
#if $varExists('nameservers')
#for $server in $nameservers
nameserver $server
#end for
#end if
#if $varExists('searchdomains')
search #slurp
#for $search in $searchdomains
$search #slurp
#end for
#end if
#if $varExists('domain')
domain $domain
#end if
#if $varExists('sortlist')
sortlist #slurp
#for $sort in $sortlist
$sort #slurp
#end for
#end if
#if $varExists('options') or $varExists('flags')
options #slurp
#for $flag in $flags
$flag #slurp
#end for
#for $key, $value in $options.items()
$key:$value #slurp
#end for
#end if
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