Github user zentol commented on the issue:
https://github.com/apache/flink/pull/3495
i will make a number of changes before merging it.
- added a hack to deal with options using
`System.getProperty("java.io.tmpdir")` as the default value
- replace `>` and `<` in descriptions and default values
- all keys are now tagged as `<h5>` to allow linking
- empty String default values are treated as not having a default value
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