For today’s Turing Day I further explored Google Data Studio reports.
ParSys Properties Report
- Page 1 shows an overview of ParSys properties and a number of other Google Analytics properties I can access.
- Page 2 has specific Discourse analytics.
Report Link
Unfortunately the “do not require sign-in” feature does not seem to work. So you need a Google account. 
https://datastudio.google.com/open/0Bwd50xAAMHH5RFM2bmlsRU1zc1k
Feedback welcome
As usual, feedback is welcome. If you want to play around with the report, let me know your Google account and I can give you edit rights.