Jenkins understands Checkstyle analysis report XML format. When this option is configured Jenkins shows the Checkstyle analysis results in different views: historical result trend, module and package statistics, web UI for viewing analysis reports and warnings, and so on.

You need to set up your build to run Checkstyle in order to use this feature - this Jenkins plug-in does not perform the actual analysis! This plug-in is not invoked for failed builds, it is only called for stable or unstable builds (i.e., a build with failed tests).