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PS-11179: Default ps57 PS MTR to CLOUD=auto#520

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PS-11179: Default ps57 PS MTR to CLOUD=auto#520
nogueiraanderson wants to merge 1 commit into
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PS-11179-ps57-cloud-auto-default

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@nogueiraanderson nogueiraanderson commented May 28, 2026

Feature

  • Flips default CLOUD choice for the 3 ps57 PS MTR jobs from Hetzner to auto, rolling resolveArmWorker routing to ps57 leaves after the canary on ps57 passes.

Why

  • Substrate live: resolver + flag merged in PR 4125, Graviton Fleet on ps57 via cd PR 18, EC2FleetCloud codification in flight in PR 4126 (open, review pending); pipeline-wiring PR 518 merged; smoke validated end-to-end on m8g.2xlarge.
  • ps57 = 3 jobs = small blast surface; ps80 (9 jobs) follows post-Friday PS-11206 cutover.

Tickets

  • PS-11179 (this PR) / Predecessor PR 518 (merged) / Sequel PR C (ps80 default flip).
  • Supersedes PR 519 (auto-closed when its base branch was deleted at PR 518 squash-merge).

…eaves (PS-11179 PR B)

- Reorder choices so 'auto' is first (JJB makes first choice the default).

- Rolls the resolveArmWorker routing to the 3 ps57 MTR jobs. Land after the predecessor PR 518 merges and the canary on ps57 passes.
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