This plugin wraps the server-side functionality of JGit so that other plugins can easily expose Git repositories from Jenkins via its SSH transport and HTTP in a collaborative fashion. This plugin is a library plugin, in the sense that it doesn't have any user visible feature on its own.
see [https://wiki.jenkins-ci.org/display/JENKINS/Git+Server+Plugin]
use [https://issues.jenkins-ci.org/] to report issues / feature requests