The text within the plots generated by Jenkins' Plot plugin is illegible, as it uses a very small cursive font. It appears as though I am missing a Java font used by this plugin; however, I have no idea how to install or find such fonts. I'm using OpenJDK 1.6.0, and have JRE 6u23 installed.
It's the same issue experienced at the Labels-are-unreadable-in-charts, but much to my dismay, the user did not post the solution after figuring out how to fix the problem.