Updated NOTICE, release notes

NOTICE.txt

@@ -1,5 +1,5 @@
 Apache ZooKeeper
-Copyright 2009-2023 The Apache Software Foundation
+Copyright 2009-2024 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

zookeeper-docs/src/main/resources/markdown/releasenotes.md

@@ -14,6 +14,48 @@ See the License for the specific language governing permissions and
 limitations under the License.
 //-->
 
+
+# Release Notes - ZooKeeper - Version 3.9.3
+                
+## Bug
+
+* [ZOOKEEPER-2332](https://issues.apache.org/jira/browse/ZOOKEEPER-2332) - Zookeeper failed to start for empty txn log
+* [ZOOKEEPER-2623](https://issues.apache.org/jira/browse/ZOOKEEPER-2623) - CheckVersion outside of Multi causes NullPointerException
+* [ZOOKEEPER-4293](https://issues.apache.org/jira/browse/ZOOKEEPER-4293) - Lock Contention in ClientCnxnSocketNetty (possible deadlock)
+* [ZOOKEEPER-4394](https://issues.apache.org/jira/browse/ZOOKEEPER-4394) - Learner.syncWithLeader got NullPointerException
+* [ZOOKEEPER-4409](https://issues.apache.org/jira/browse/ZOOKEEPER-4409) - NullPointerException in SendAckRequestProcessor
+* [ZOOKEEPER-4508](https://issues.apache.org/jira/browse/ZOOKEEPER-4508) - ZooKeeper client run to endless loop in ClientCnxn.SendThread.run if all server down
+* [ZOOKEEPER-4712](https://issues.apache.org/jira/browse/ZOOKEEPER-4712) - Follower.shutdown() and Observer.shutdown() do not correctly shutdown the syncProcessor, which may lead to data inconsistency
+* [ZOOKEEPER-4733](https://issues.apache.org/jira/browse/ZOOKEEPER-4733) - non-return function error and asan error in CPPUNIT TESTs
+* [ZOOKEEPER-4752](https://issues.apache.org/jira/browse/ZOOKEEPER-4752) - Remove version files  in zookeeper-server/src/main from .gitignore
+* [ZOOKEEPER-4804](https://issues.apache.org/jira/browse/ZOOKEEPER-4804) - Use daemon threads for Netty client
+* [ZOOKEEPER-4814](https://issues.apache.org/jira/browse/ZOOKEEPER-4814) - Protocol desynchronization after Connect for (some) old clients
+* [ZOOKEEPER-4839](https://issues.apache.org/jira/browse/ZOOKEEPER-4839) - When DigestMD5 is used to enable mandatory client authentication,Users that do not exist can log in
+* [ZOOKEEPER-4843](https://issues.apache.org/jira/browse/ZOOKEEPER-4843) - Encountering an 'Unreasonable Length' error when configuring jute.maxbuffer to 1GB or more
+            
+## New Feature
+
+* [ZOOKEEPER-4747](https://issues.apache.org/jira/browse/ZOOKEEPER-4747) - Java api lacks synchronous version of sync() call
+    
+## Improvement
+
+* [ZOOKEEPER-4850](https://issues.apache.org/jira/browse/ZOOKEEPER-4850) - Enhance zkCli Tool to Support Reading and Writing Binary Data
+* [ZOOKEEPER-4851](https://issues.apache.org/jira/browse/ZOOKEEPER-4851) - Honor X-Forwarded-For optionally in IPAuthenticationProvider
+* [ZOOKEEPER-4860](https://issues.apache.org/jira/browse/ZOOKEEPER-4860) - Disable X-Forwarded-For in IPAuthenticationProvider by default
+    
+## Test
+
+* [ZOOKEEPER-4859](https://issues.apache.org/jira/browse/ZOOKEEPER-4859) - C client tests hang to be cancelled quite often
+        
+## Task
+
+* [ZOOKEEPER-4820](https://issues.apache.org/jira/browse/ZOOKEEPER-4820) - zookeeper pom leaks logback dependency
+
+
+ 
+
+                                                                                                                                                        
+
 # Release Notes - ZooKeeper - Version 3.9.2
 
 ## Sub-task