There are a number of known data quality issues that affect the correctness of what is reported on Wikistats. These include:
- Page View Loss - https://phabricator.wikimedia.org/T300164
- Unique Devices Overcount: https://phabricator.wikimedia.org/T319213
While the long term solution to handle these issues is still TBD and still to be prioritized as per https://phabricator.wikimedia.org/T310732, an interim solution would be to provide a list of known issues and link from the relevant dashboards.
- Have a page on Wikistats to outline the known issues and link from the affected dashboards
- Outline data issues on Wikitech and link from the affected wikistats dashboards