Resolved
App operations are fully restored.
Update
App operations have been restored.
A load spike on the Aspen stack caused the interruption. We have added new capacity to the aspen stack, and are actively monitoring the situation to ensure resolution.
Issue
Apps running on the Aspen Stack (http://docs.heroku.com/stack) are experiencing interrupted service. You can not git push, nor will idled apps un-idle.
Apps running on the Bamboo stack are unaffected, as are apps with existing traffic on Aspen.