There is no way to turn off issues while still leaving the existing ones visible.
So please don't open new ones here but use the jenkins-ci.org jira here: https://issues.jenkins-ci.org/secure/IssueNavigator.jspa?reset=true&jqlQuery=project+%3D+JENKINS+AND+status+in+%28Open%2C+%22In+Progress%22%2C+Reopened%29+AND+component+%3D+%27github-oauth%27
The repository receiving commits and where releases are made is here: https://github.com/jenkinsci/github-oauth-plugin
This repository is no longer maintained.