Per IRC conversation today in #wikimedia-sre , community member @Dominicbm reported commons-query.wikidata.org (the web UI for WCQS) as down. Further troubleshooting by @EBernhardson , @dcausse and @Dzahn revealed an issue with firewall rules . Once the linked changes were reverted, the site returned to service.
However, the site *was* down for ~1 week without the responsible SRE team (Data Platform SRE, which includes myself) noticing. To prevent this from happening in the future, we should add monitoring for commons-query.wikidata.org. Creating this ticket to:
- Add a blackbox check for commons-query.wikidata.org
- Add alerts for this site.