https://query.wikidata.org/ provides a 'how up to date is the data' feature, illustrated in two screengrabs below.

The screengrabs are of the same report, run about 30 second apart from each other. One run finds ~7k rows, the other ~4k rows.

Both report that data was updated a few seconds ago.

One report has presumably hit wdqs1006, which is >3 hours out of date, but which has indeed been updated a few seconds ago. The other report has hit an up-to-date report server.

As a user, it is of no interest to me to know that the server "was updated a few seconds ago" if that is masking the fact that the server is stale by hours.

Suggest that the 'how up to date is the data' feature should be reporting on lag for the connected server, exactly as grafana does; and that the UI should indicate to the user which report server is connected.