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ci: address second review round — dependabot lane, drop dead restore, update topology note

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- Route untrusted PRs (forks + Dependabot, same author test as e2e.yml)
  back to the hosted enterprise pool via a runs-on expression: Dependabot
  PRs are same-repo, so the previous head.repo guard admitted
  dependency-supplied code onto the persistent self-hosted VM. A single
  job with pool selection keeps all-checks-passed free of skips.
- Drop the pnpm-store cache restore from this lane: on self-hosted the
  hosted-path cache actually HIT (Linux key) and spent ~52 s pulling
  181 MB into a path pnpm never reads; the persistent local store
  already serves warm installs in seconds.
- Update the larger-hosted-runners Agent Note (en/zh + i18n pairing
  record) so the decision record describes the shipped topology:
  coverage on the in-house vm-backup pool for trusted PRs, hosted
  Ubuntu 24.04 32-core retained for untrusted PRs.
This commit is contained in:
Chinesezjc
2026-07-24 23:00:56 +08:00
parent b28402f731
commit 5818fd6224
4 changed files with 23 additions and 24 deletions
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.agents/notes/implemented/process/2026-07-22-evidence-based-larger-hosted-runners.md
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@@ -12,7 +12,7 @@ Larger runners make it possible to pay setup once and parallelize inside the rep
## Decision
The enterprise keeps repo-restricted x64 larger-runner pools for Ubuntu and Windows. Ordinary pull requests name three 32-core pools directly: Ubuntu 24.04 for exhaustive coverage, Ubuntu latest for the remaining primary Node 24 inventory, and Windows 2025 for blocking Windows contracts. Public IPs are disabled, and workflow concurrency remains bounded because an autoscaling ceiling neither allocates idle machines nor makes repository work scale without limit.
The enterprise keeps repo-restricted x64 larger-runner pools for Ubuntu and Windows. Ordinary pull requests name two 32-core hosted pools directly: Ubuntu latest for the remaining primary Node 24 inventory and Windows 2025 for blocking Windows contracts. Exhaustive coverage moved off the metered Ubuntu 24.04 32-core pool onto the in-house self-hosted pool (`vm-backup` label: a 64-core VM running four always-on systemd-managed runner instances plus four registered spares) for trusted same-repo PRs; untrusted PRs — forks and Dependabot — keep coverage on the hosted Ubuntu 24.04 32-core pool so dependency-supplied code never reaches the persistent VM. Public IPs are disabled, and workflow concurrency remains bounded because an autoscaling ceiling neither allocates idle machines nor makes repository work scale without limit.
The required primary path depends on those enterprise pools. Standard GitHub-hosted jobs retain the Node 22.19, Node 26, and Python SDK compatibility contracts, while the [portable recovery boundary](2026-07-23-portable-required-pull-request-ci.md) and [serial reference](2026-07-21-serial-cross-platform-ci-reference.md) keep complete standard-runner evidence available on `master`. `suite=larger-runner-benchmark` compares isolated critical lanes across provisioned sizes, and `suite=consolidated-runner-benchmark` compares whole aggregates. Each benchmark reports its observed processor and memory capacity before running repository work.