Placeholder Task

Context

Wikidata is migrating its backend triple store system from Blazegraph to Qlever. While both use standard sparkl syntax, there will be some changes to how queries need to be written. This will potentially impact usage, especially when it comes to the query service UI.

As of 2026/08/17, the final endpoints are ready, but there could be changes to the proxy (see T434535: wdqs-proxy: configurable prefixes)

T432438 - Implement QLever into Query Service GUI
T433704 - Implement QLever into Wikibase Quality Constraints

Endpoints

• Blazegraph
  • https://query.wikidata.org/
  • https://query-scholarly.wikidata.org/
• QLever
  • https://query-next.wikidata.org/
  • https://query-scholarly-next.wikidata.org/
• legacy-full https://query-legacy-full.wikidata.org/ also exists, but is not a consideration for this task

This is a placeholder for us to check data / reporting availability for metrics that we should monitor as part of the Blaze Graph migration. The technical functioning (ie errors / requests) would be handled by the Omega team. However, there are some metrics we should monitor as the change is rolled out. To help the team understand how the change is impacting users / usage:

Example metrics (to be discussed and refined properly) - trended:

• User count
• Request count
• Requests per user

T414426: Migrate airflow dags from the Search Platform instance to Wikidata Platform