DC/OS Zookeeper does not log manage.
It appears that log4j for Zookeeper as part of DCOS Master software doesn't properly log rotate.
Specifically, /var/lib/dcos/exhibitor/zookeeper/zookeeper.out on the ACS master nodes
appears to grow unbounded in disk consumption.
This is not ideal as it will eventually cause the node's disk to fill up and is not an obvious problem or maintenance item for manual intervention.
The default behavior should be configured to log rotate daily and on a max file size. Keeping a bounded total consumption of disk space.
The plan is to get rid of zookeeper.out, since the same log is going to the dcos-exhibitor.service journal anyway.
https://github.com/dcos/dcos/pull/1006 is the PR. Still figuring out the exact way we want to achieve this.