This task is part of WE6.4.4 Mobile domain sunsetting ([FY25-26 Q1](https://meta.wikimedia.org/wiki/Wikimedia_Foundation_Annual_Plan/2025-2026/Product_%26_Technology_OKRs#Q1)), as tracked by the parent task T214998.
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The hypothesis is as follows (emphasis mine):
> If we unify our domains by serving all page views on MediaWiki sites through a canonical domain, then we will reduce platform complexity and Search Engine Optimization (SEO) risks by eliminating the mobile-subdomain redirect. **Completion is measured by decreasing redirects for mobile visits on canonical domains from 100% to 0%.**
## Work
* [ ] Write Hadoop query that measures the completion metric* [x] A week after the pilot rollout (T401595), and run it for July 2025review traffic on a pilot wiki and August 2025 to set our baselinevalidate the basic working of the query and the change.
* [ ] A week after the pilot rollout (T401595), run it for the pilot wiki, and validate the basic working of the query and the changex] Decide on which wikis and wiki families of the main rollout (T403510) to check as milestones.
* [ ] Decide on which wikis and wiki families of the main rollout (T403510)Write Hadoop query that measures the completion metric, and run it for July 2025 and August 2025 to check as milestonesset our baseline.
* [ ] During the main rollout (T403510), run it every few weeks for the week before/after the change on a given wiki, and validate the changeand report progress, looking for anything unexpected that might prevent us from reaching our target.
## See also
* SEO impact: T400022
* Performance impact: T403685