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

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PS-11179-ps57-cloud-auto-default
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PS-11179: Default ps57 PS MTR to CLOUD=auto#520
nogueiraanderson wants to merge 1 commit into
8.0from
PS-11179-ps57-cloud-auto-default

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@nogueiraanderson nogueiraanderson commented May 28, 2026

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Feature

  • Flips the default CLOUD choice for the 3 ps57 PS MTR jobs from Hetzner to auto, so resolveArmWorker routes them automatically.

Why

  • Hetzner ARM (CAX) capacity has been unavailable since 2026-04-02 with no vendor ETA, so ps57 arm64 MTR builds stall in the Hetzner queue during release windows.
  • With Hetzner as the default, those builds never reach the AWS Graviton fallback that is already live on ps57 (fleet + health probe), so the outage keeps blocking ARM validation.
  • The auto mode sends arm64 to AWS Graviton only when the controller flag reports Hetzner ARM down, and leaves x86_64 on Hetzner; ps80 already defaults to auto (PR 522, merged), so this brings ps57 to parity.

Tickets

  • PS-11179 (this PR); pipeline wiring PR 518 (merged).
  • Companion: PR 522 (merged), the ps80 default flip on param-parallel-mtr + pipeline-parallel-mtr.

…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.
@nogueiraanderson nogueiraanderson marked this pull request as ready for review June 5, 2026 17:11
@nogueiraanderson nogueiraanderson requested review from inikep and removed request for EvgeniyPatlan June 8, 2026 13:04
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