DO NOT USE THIS INSTANCE FOR LIVE DATA!!!!
I looked at this doc:
https://github.com/apache/hadoop/blob/9636fe4114eed9035cdc80108a026c657cd196d9/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/NodeManagerCGroupsMemory.md
It does not show up here:
https://hadoop.apache.org/docs/stable/