The time and data sent are logged to the debug log when it is enabled. The data points are implemented in the includes/Pingback.php file.
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.
Starting with MediaWiki 1.31.0, a monthly heartbeat ping will be sent by active wikis (see T189785).
Users may enable or disable the pingback at any time by setting the $wgPingback configuration variable in LocalSettings.php. This will not delete any data 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 tracks upgrades made to wikis over time.
You may view your wiki’s ID after a pingback is sent by running the following SQL command:
SELECT * FROM updatelog WHERE ul_key = 'PingBack';
For more information, please see the complete MediaWiki Pingback privacy statement.
Aggregate pingback data is available at https://pingback.wmcloud.org. The code behind those queries displayed on that page can be found in the analytics/reportupdate-queries repo. The config can be found on meta.
Currently, the raw pingback data is stored in the Wikimedia Foundation's Data Lake. Users with a signed NDA with the WMF (see wikitech:Volunteer NDA for the process) can access the data via analytics machines.
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