Manual:$wgPingback

Identifying information
Installations are identified by a string that is generated when the pingback feature is first used and remains the same unless manually removed (it is stored in the  table under the   key).

The string is completely random, it does not include any information about the installation.

In the EventLogging data it is stored in the   column.

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).