Github user nkalmar commented on the issue:
https://github.com/apache/zookeeper/pull/572
The build failed due to NetUtilsTest not having apache license. I did not
create or made modification to that file. I checked master, it is currently in
the same way, so master should fail with this warning as well.
[rat:report] !?????
/home/jenkins/jenkins-slave/workspace/PreCommit-ZOOKEEPER-github-pr-build/build/zookeeper-3.6.0-SNAPSHOT/src/java/test/org/apache/zookeeper/common/NetUtilsTest.java
Lines that start with ????? in the release audit report indicate files that
do not have an Apache license header.
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