We’re introducing calendar-based versioning for our REST API, so we can keep evolving our API, whilst still giving integrators a smooth migration path and plenty of time to update their integrations.
This Saturday, August 31st, 2013 at 5AM PDT we will be upgrading a large portion of our database infrastructure in order to provide a faster and more reliable GitHub experience.
We estimate that the upgrades should take no longer than 20 minutes. In order to minimize risk we will be putting the site into maintenance mode while the upgrade is performed. Thus, HTTP, API and Git access to GitHub.com will be unavailable for the duration of the upgrade.