Wikimedia Release Engineering Team/Pretrain/Progress reports/2026-06-26

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Pretrain progress reports week ending 2026-06-26

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Report on activities in the Pretrain project for the week ending 2026-06-26.

[WE6.7.2] Routing test

Tracked in Phabricator
Task T427659

If we create the Pretrain deployment environment using existing production MediaWiki container images and begin routing testwiki traffic to it, we will develop confidence that our routing design is sufficiently complete to support the full Pretrain MVP (e.g., all testwiki traffic is reliably served by the Pretrain environment and container).

Progress update

Stage: Engineering/Development
This week, work continued on mw-pretrain service turnup (T427668). We are now focused on bringing up a minimal "pilot" service in order to facilitate testing and validate our understanding of k8s Ingress routing. We also started to explore implementation options to support the various "flavors" of traffic diversion that will be necessary to route traffic to Pretrain (T427666), including proofs-of-concept for evaluation.

Any new metrics related to the hypothesis

None

Any emerging blockers or risks

Not yet

Any unresolved dependencies - do you depend on another team that hasn’t already given you what you need? Are you on the hook to give another team something you aren’t able to give right now?

No

Have there been any new lessons from the hypothesis?

Not yet

Have there been any changes to the hypothesis scope or timeline?

No

[WE6.7.3] Automated supervision

Tracked in Phabricator
Task T427968

If we implement an initial set of automated supervision strategies and enable automated deployment to the Pretrain environment for the routing test, we will develop confidence that automated supervision is ready to serve as our primary risk mitigation for the full Pretrain MVP (e.g., false positives are understood, and we have identified a path to mitigate them).