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.

Enabling the Pingback; Data collection and use
The web installer asks the user if they want to enable the feature during the installation of MediaWiki. The user may choose at this time to opt out of the pingback. If the user opts in, the pingback feature will send new data on the first page load after upgrading to a new version of MediaWiki. Users may choose to disable the pingback at any time by setting the $wgPingback configuration variable to false in LocalSettings.php. However, this will not delete any data that has already been transmitted to our servers.

The pingback anonymously tracks which version of MediaWiki is being used, along with the configured database type and PHP version, as well as your operating system, system type (32-bit or 64-bit), machine hardware, server software, and memory limit. The feature also sends a unique ID with the data transmission, which is used to track upgrades made to wikis over time.

You may view your wiki’s ID after a pingback is sent by running the following SQL command:

You can delete the ID by running the following SQL command.

If you delete it, a new unique ID will be generated the next time a pingback is sent. However, please note that deleting the ID could cause your instance of MediaWiki to be counted twice, thereby affecting decisions made based on the data.

For more information, please see the complete MediaWiki Pingback privacy statement.

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).