+.. changelog::
+ :version: 4.1.12
+ :released: 2nd of April 2019
+
+ .. change::
+ :tags: Bug Fixes, Internals
+ :pullreq: 7495
+ :tickets: 7494
+
+ Correctly interpret an empty AXFR response to an IXFR query.
+
+ .. change::
+ :tags: Improvements, Internals
+ :pullreq: 7647
+
+ Provide CPU usage statistics per thread (worker & distributor).
+
+ .. change::
+ :tags: Improvements, Internals, Performance
+ :pullreq: 7634
+ :tickets: 7507
+
+ Use a bounded load-balancing algo to distribute queries.
+
+ .. change::
+ :tags: Improvements, Internals
+ :pullreq: 7651
+ :tickets: 7631, 7572
+
+ Implement a configurable ECS cache limit so responses with an ECS scope more specific than a certain threshold and a TTL smaller than a specific threshold are not inserted into the records cache at all.
+