Now that YouTube's Reporting API has been live for roughly half a year, YouTube has started adding new features. The latest new feature is historical data. Historical Data provides a 180 day lookback from a particular job's schedule date. Historical data is available beginning July 1, 2015.
One of the challenges with building an application these days is the number of dependencies that application will actually have on other applications. Ideally in order to know how that application will actually perform application developers would be able to test their application against the application it depends on running in production. The odds of that happening, however, are slim to none, especially if that other application is running as a cloud service that has to be always available to end users.