When upgrading to 1.565.3 from 1.565.2 openid stopped working.
No error messages in log.
Google is phasing out OpenID endpoint. Need to move on to G+ sign-in
I first thought I might be experiencing a new OpenId problem with Jenkins, but it turns out to be Google phasing our OpenId/OAuth support in favor of their proprietary solution. More info: https://issues.jenkins-ci.org/browse/JENKINS-23431