Manual:$wgPingback

System information reported
Other reported data is in the 1>#Privacy of Data|Privacy of Data section.

Implementation
The time and data sent is logged to the debug log when it is enabled. The data points are implemented in the includes/Pingback.php file.

Privacy considerations
MediaWiki's wmf>wmf:Privacy policy|privacy policy appears to cover data collected via the pingback feature. Changes to that privacy policy are sent to the WikimediaAnnounce mailing list.

The pingback feature will send new data on the first page load after upgrading to a new MediaWiki version. It can be disabled at any time by setting it to false, but that will not remove any previously sent data.

As the data is transmitted via a request to Wikimedia Foundation servers, your server's IP address will be logged in the web request logs. Because a unique ID is set with each request, it would be possible for someone with access to Wikimedia's server access logs and the pingback data to determine what wiki sent the specific data. The purpose of the unique ID is to be able to de-duplicate events after a wiki upgrades their MediaWiki version. To view your wiki's ID, run the following SQL command:

To reset the ID, just delete the row:

This could cause MediaWiki developers to double count your instance of MediaWiki, potentially skewing decisions made based on the data.

Changes to the data that is sent must be approved by a MediaWiki developer with merge permissions.

Access to data
Currently the data is stored in Wikimedia's EventLogging database.

Users with a signed NDA with the WMF can access the data via analytics machines.

It is planned to make aggregated data publicly available (see T152222).