Runbooks for WDQS on Wikitech should be reviewed and updated as needed for the new QLever backend that is replacing Blazegraph.

• https://wikitech.wikimedia.org/wiki/Wikidata Query Service/Runbook
• https://wikitech.wikimedia.org/wiki/Wikidata Query Service/Runbook/High replication lag and query timeout
• https://wikitech.wikimedia.org/wiki/Wikidata Query Service/Runbook/Update not propagated to WDQS
• https://wikitech.wikimedia.org/wiki/Wikidata Query Service/Runbook/ElevatedMaxLagWDQS
• https://wikitech.wikimedia.org/wiki/Wikidata Query Service/Wikimedia Commons Query Service/Runbook

Additional playbooks found in other places:

• https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/WDQS_backend_update/Blazegraph_failure_playbook
• https://wikitech.wikimedia.org/wiki/Wikidata_Query_Service/Streaming_Updater#Runbooks

There's also a list of runbooks at https://wikitech.wikimedia.org/wiki/Wikidata_Platform#Runbooks which should be updated to ensure it reflects the relevant pages (or perhaps a category applied to the pages instead).