Merge remote-tracking branch 'origin/ci/offload-coverage-to-vm-backup' into ci/offload-coverage-to-vm-backup
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Chinesezjc
@@ -2,5 +2,5 @@
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# side as of the last confirmed-consistent state. Both languages carry equal authority;
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# after editing either side, bring the other along and re-record with:
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# pnpm run verify-translation-pairing --write .agents/notes/implemented/process/2026-07-22-evidence-based-larger-hosted-runners.md
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2026-07-22-evidence-based-larger-hosted-runners.md: 180cc03ad091b2e9e96a86311515250f92065c6b
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2026-07-22-evidence-based-larger-hosted-runners.zh.md: b81f67805fd543e81ede02ceeac2dda1831f4cef
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2026-07-22-evidence-based-larger-hosted-runners.md: 67fc7ded5cffc6a219665f135a4c9e1cc4752691
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2026-07-22-evidence-based-larger-hosted-runners.zh.md: 71c5c067361b57fab5aae9e9ffa3850a30609db3
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@@ -52,7 +52,7 @@ The process-bound coverage project contains exactly five suite files. Thirty-two
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Complete serial Linux, macOS, and Windows references run only when `master` moves. Pull requests use the enterprise required path plus standard-hosted compatibility jobs, while other larger-runner sizes run only by manual dispatch.
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An additional serial Linux reference runs on the in-house self-hosted pool (`vm-backup` label: a 64-core VM with six always-on systemd-managed runner instances) on every `master` push. It is a hot-standby drill, not a required check: each run re-proves that the persistent VM can execute the complete unsharded aggregate. The actual switch is pre-wired: the three required Linux jobs resolve their pool through the writer-manageable `DSH_CI_FAILOVER` repository variable, so an outage response is setting one variable and re-running — no merge, which would be deadlocked behind the failing checks themselves ([runbook](2026-07-26-ci-failover-runbook.md)). Because the standby lane is push-triggered, it always executes the base branch's workflow definition — no pull-request-editable path can route code to these runners, and the repository additionally keeps forking disabled.
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An additional serial Linux reference runs on the in-house self-hosted pool (`vm-backup` label: a 64-core VM with six always-on systemd-managed runner instances) on every `master` push. It is a hot-standby drill, not a required check: each run re-proves that the persistent VM can execute the complete unsharded aggregate. The actual switch is pre-wired: the three required Linux jobs resolve their pool through the writer-manageable `DSH_CI_FAILOVER` repository variable, so an outage response is setting one variable and re-running — no merge, which would be deadlocked behind the failing checks themselves ([runbook](2026-07-26-ci-failover-runbook.md)). The standby lane is push-triggered, so it always executes the base branch's workflow definition. Under failover, however, `pull_request` jobs do reach these runners with the PR merge ref's own workflow definition — the trust boundary is repository membership (the repository is private with forking disabled, and the selectors exclude Dependabot), as the [failover runbook](2026-07-26-ci-failover-runbook.md) records.
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## Alternatives considered
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@@ -52,7 +52,7 @@ Windows 仓库工作在超过 16 核后收益很小，但 32 核池可以让完
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只有在 `master` 移动时，才运行完整的 Linux、macOS 和 Windows 串行参考。拉取请求使用企业级运行器必需路径和标准托管兼容性作业，其他大型运行器规格仅通过手动触发运行。
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另有一条串行 Linux 参考在每次 `master` 推送时运行于公司自有的自托管池（`vm-backup` 标签：一台 64 核虚拟机，运行 6 个常驻的 systemd 管理运行器实例）。它是热备演练而非必需检查：每次运行都重新证明这台持久化虚拟机能够执行完整的未分片聚合流程。实际切换机制已预先布线：三个必需 Linux 作业通过写者可管理的仓库变量 `DSH_CI_FAILOVER` 解析运行器池，因此故障响应就是设置一个变量并重跑——无需合并（合并本身会被正在失败的检查死锁）（[切换手册](2026-07-26-ci-failover-runbook.md)）。该热备通道由 push 触发，执行的始终是基线分支自身的工作流定义——不存在任何可由拉取请求编辑的路径能把代码路由到这些运行器上；此外仓库继续保持禁用 fork。
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另有一条串行 Linux 参考在每次 `master` 推送时运行于公司自有的自托管池（`vm-backup` 标签：一台 64 核虚拟机，运行 6 个常驻的 systemd 管理运行器实例）。它是热备演练而非必需检查：每次运行都重新证明这台持久化虚拟机能够执行完整的未分片聚合流程。实际切换机制已预先布线：三个必需 Linux 作业通过写者可管理的仓库变量 `DSH_CI_FAILOVER` 解析运行器池，因此故障响应就是设置一个变量并重跑——无需合并（合并本身会被正在失败的检查死锁）（[切换手册](2026-07-26-ci-failover-runbook.md)）。该热备通道由 push 触发，执行的始终是基线分支自身的工作流定义。但需要注意：故障切换期间，`pull_request` 作业确实会带着 PR merge 引用自带的工作流定义到达这些运行器——信任边界是仓库成员资格（仓库为私有且禁用 fork，选择器排除 Dependabot），详见[故障切换手册](2026-07-26-ci-failover-runbook.md)的记录。
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## 曾考虑的替代方案
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7
.github/workflows/ci.yml
vendored
7
.github/workflows/ci.yml
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# continuously proving that environment can take over a required lane if
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# the hosted pools degrade (the switch is then setting the writer-manageable
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# DSH_CI_FAILOVER variable — see the failover runbook, no merge required).
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# Push-triggered, so it always executes the base branch's own workflow
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# definition — no PR-editable path selects these runners. Non-blocking for
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# Push-triggered, so this lane always executes the base branch's own
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# workflow definition. (Under failover, pull_request jobs do reach these
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# runners with the PR merge ref's workflow — the boundary there is
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# repository membership: private, forking disabled, Dependabot excluded.)
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# Non-blocking for
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# pull requests; no cache steps because the VM's persistent pnpm store and
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# tool caches make them redundant (and saving here would poison the hosted
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# cache namespace with self-hosted paths).
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