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replace Google Analytics with Piwik #63
As explained in the Issue you linked to, we plan to continue using Google Analytics until we migrate to an internal GitHub metrics infrastructure. The migration to the internal GitHub metrics infrastructure will achieve the same goal as your proposed migration to Piwik and will require the same commitment of resources.
The resources that we have to spend answering questions that have already been answered cannot then be devoted to things like migrating to any other metrics infrastructure.