This monitors the available disk space of the temporary directory, and if it gets below a certain threshold the node will be made offline.

Java tools and tests/builds often create files in the temporary directory, and may not function properly if there's no available space.

More specifically, it checks the available disk space of a partition that includes directory designated by the `java.io.tmpdir` system property. To check where this directory is on a given agent, go to `${rootURL}/computer/SLAVENAME/systemInfo`.