Concerns/warnings in upgrading from 9.9 to 9.11?

[Oscar Ricardo Silva]

I currently run 9.9.9-P4 on recursive caching servers and with the 
announcement that 9.9 and 9.10 are approaching end of maintenance, I've 
decided it's time to move to 9.11.

Are there any issues, warnings, concerns in upgrading? Changes that need 
to be made to named.conf? I know there are new features but I'm more 
concerned about an in-place upgrade with no change to the current build 
process or configuration.


named.conf:

options {
	listen-on port 53 {
		128.83.1.10;
		127.0.0.1;
	};
	listen-on-v6 port 53 { ::1; };
	directory	 	"/var/named";
	dump-file 		"/var/named/data/cache_dump.db";
         statistics-file		"/var/named/data/stats/named.stats";
         memstatistics-file	"/var/named/data/stats/named_mem.stats";
	managed-keys-directory	"/var/named/dynamic/";
	allow-query     {
		any;
	};
	empty-zones-enable no;
	minimal-responses yes;
	recursion		yes;
	max-ncache-ttl		3600;
	dnssec-enable		no;
	dnssec-validation	no;
	querylog		yes;
	recursive-clients	100000;
	version			"none";
};

include	"/etc/named.rfc1912.zones";
include	"/etc/managed-keys.conf";
include "/etc/rndc.key";

controls {
	inet 127.0.0.1 port 953
		allow { 127.0.0.1; } keys { "rndc-key"; };
};

zone "." IN {
	type hint;
	file "/etc/named.root";
};




Oscar