Jenkins has used Jira for bug tracking since before GitHub existed, so although the project's code and all plugins are now managed on GH, bug tracking continues to live in Jira. Anyone can create an account and add issues here: https://issues.jenkins-ci.org/secure/Dashboard.jspa All plugins track issues there, so you just put the appropriate plugin, or "core" for Jenkins itself, in the 'component' field and the issue should be assigned to the right person.