/usr/share/samba/setup/secrets_dns.ldif is in samba4 4.0.0~alpha18.dfsg1-4ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | #Update a keytab for the external DNS server to use
dn: samAccountName=dns-${HOSTNAME},CN=Principals
objectClass: top
objectClass: secret
objectClass: kerberosSecret
realm: ${REALM}
servicePrincipalName: DNS/${DNSNAME}
msDS-KeyVersionNumber: 1
privateKeytab: ${DNS_KEYTAB}
secret:: ${DNSPASS_B64}
samAccountName: dns-${HOSTNAME}
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