From the Wikimedia Blog:
Wikistats 2 builds on the success of Wikistats, the project started more than 15 years ago by Erik Zachte. Wikistats has been the canonical source of statistics about the reach and impact of the Wikimedia movement for many years. It offered a quantitative mirror to the Wikimedia communities to reflect on their growth, gaps and strategic opportunities.
It also provided one of the earliest public data sources for the study of large-scale peer production communities, and as such has been cited nearly a thousand times in the literature.
[Our emphasis] You may notice that the data that exists in Wikistats 2.0 is the same data that existed in Wikistats. For this alpha release, we decided to replicate the existing metrics. In doing so we had two goals in mind: We wanted to test this new dashboard against a time-proofed one, and we also wanted to provide existing Wikistats users with statistics that closely matched those they are familiar with. We succeeded relatively well at replicating the existing statistics.
A brand new front-end has also been designed and built on top of the new API. The dashboard concentrates many information, providing an easy way to overlook any project at a glance. More details can be found in the three sections of the dashboard which are labeled Contributing, Reading and Content.
Direct to Wikistats 2
Direct to Wikistats 2 Documentation