Github user eribeiro commented on the issue:
https://github.com/apache/zookeeper/pull/466
Cool. :)
FYI, https://issues.apache.org/jira/browse/ZOOKEEPER-2693
Particularly, this quote:
_"A simple patch would provide a configuration option that disables these
4lw by default. We should include this in 3.4/3/5 code lines. Additionally in
3.5 Jetty metrics support was added, replacing the legacy 4lw. In 3.5.3 and
later we should disable 4lw entirely (through a second config option) and
encourage people to use Jetty instead."_
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