JENKINS-19022 describes the git plugin's flawed retention of build data from all preceding builds. Users that need to retain many builds from many branches in a single job may run out of memory due to "BuildData bloat".
A Jenkins wiki page describes the workaround to remove the BuildData bloat. The contents of that wiki page should be included in the Git plugin documentation rather than being in a wiki page.
After the pull request has been merged, use the wiki migration instructions to submit a pull request to redirect from the Wiki page to the git plugin documentation section.