docs: explain quota-bound AWS runner burst capacity
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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@ -129,9 +129,14 @@ When reverting this workflow, restore the master push trigger in
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waiting, readiness signals, and exact-master migrator preparation to the
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`paperclip-post-merge` runner group. The separate Fleet label is
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`runs-on/fleet=paperclip-post-merge-x64/env=public-ci`. Its 36 reserved slots use
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the same four-vCPU, 16-GiB machines as approved PR jobs. PR capacity is reduced
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to 64; image capacity stays at eight. The total ceiling remains 108 runners.
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This keeps PR bursts from consuming every post-merge verification slot.
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the same four-vCPU, 16-GiB machines as approved PR jobs. Image capacity stays
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at eight. The initial split allocated 64 PR slots and 108 total slots. The PR
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ceiling can increase independently, subject to the applied regional EC2
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Standard On-Demand vCPU quota and the reviewed infrastructure configuration.
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For example, 100 PR, 36 post-merge, and eight image workers require 576 vCPUs.
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A pending quota increase does not supply that capacity. These are limits for
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ephemeral workers, with no idle worker pool or Reserved Instance commitment.
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The separate post-merge allocation keeps PR bursts from consuming its slots.
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Every selector checks the canonical repository name and ID, master ref, and a
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push or manual event. Reusable verification also requires `inputs.ref` to equal
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