docs(worker): answer two of the four B4 operator unknowns from measured evidence - #2228
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…ed evidence Both were read-only lookups against the live Railway project; no mutation was made. 1. Railway variable-change behaviour, and it was a latent safety trap. Railway's documentation states that containers read environment variables only at startup, so a variable change never restarts a running container by itself and the new value exists only inside the new deployment. The worker parses WORKER_DOCUMENT_EXTRACTOR_MODE once at process start and matches that exactly. Setting the variable is therefore NOT by itself the rollback. Sections 3.5 and 3.7 now state it as two steps — set the variable, then deploy — and say plainly that stopping after the first leaves docling running. 2. Worker memory limit and observed peak. Read from the production worker service over a 7-day window (10,081 samples): limit 24 GB, peak 0.566 GB, average 0.139 GB. That is ~23.4 GB of headroom against the ~1.5 GiB docling needs, so the precondition is satisfied roughly fifteen times over. Section 3.2 records the numbers and reduces the check to "re-run only if the plan or limits change". It also flags a trap the numbers invite: the service reports a 24 vCPU limit while Gate B measured 9-19 s/doc on 2 CPUs. Section 3.4 must NOT be assumed to scale down, because docling runs eager (TORCHDYNAMO_DISABLE=1) and single-process, so extra cores may buy little. The two remaining unknowns need an owner decision rather than investigation and are recorded against #1VFSYF: ratifying the proposed ">10 % of cohort runs timing out" rollback trigger, and whether to build a reader for documents.metadata.shadow_extraction now or when shadow mode is first enabled. Docs only. No code, worker, schema, or provider change; no default changed; shadow mode is still enabled nowhere. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe worker deployment runbook now documents Railway resource checks and a two-step Docling shadow-extraction enablement and rollback process. The worker startup log also includes the deployment step required for rollback. ChangesWorker deployment operations
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk:🟡 Moderate · up to The PR updates rollback and revalidation guidance, but the current files still contain conflicting instructions: the worker log does not match the runbook, one section still describes rollback as one step, and the issue record omits required rechecks. These inconsistencies could mislead operators during rollback or enablement and should be fixed before merge. Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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In `@docs/outstanding-issues-inbox/29bf4571-4bc3-42cf-8a4a-7edab14ee031.json`:
- Around line 8-9: Update the issue record’s Section 3.2 summary to state that a
busy-window memory re-check is required before every shadow enablement and after
worker image, workload, WORKER_CONCURRENCY, service-plan, or resource-limit
changes. If issue-inbox records are immutable, apply the repository’s supported
correction mechanism rather than editing the original entry in place.
In `@docs/worker-deploy-runbook.md`:
- Around line 466-490: Update the remaining “one-step flag rollback” reference
to describe the required two-step rollback: set
WORKER_DOCUMENT_EXTRACTOR_MODE=legacy, then use Railway’s apply/redeploy action
to start a new container. Ensure the surrounding operator guidance does not
imply that changing the variable alone takes effect.
In `@worker/main.ts`:
- Line 2070: Update the rollback example in docs/worker-deploy-runbook.md to
exactly match the startup log emitted by worker/main.ts: “Rollback: set
WORKER_DOCUMENT_EXTRACTOR_MODE=legacy, then deploy.”
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Summary
Answers two of the four operator unknowns recorded against
#1VFSYFindocs/worker-deploy-runbook.md§3 and aligns the worker's shadow-mode startup guidance. Both measurements came from read-only lookups against the live Railway project; no mutation of any kind was made, and no default changed. Shadow extraction remains enabled nowhere.Railway variable-change behaviour — answered, and it exposed a latent safety trap in the runbook. Railway's documentation states that "Containers read environment variables only at startup, so a variable change never restarts a running container by itself; the new value only exists inside the new deployment" (rotate-credentials-zero-downtime, read 2026-08-21).
worker/main.tsparsesWORKER_DOCUMENT_EXTRACTOR_MODEonce at process start viasrc/lib/env.ts, matching that exactly. Setting the variable is therefore not by itself the rollback. §3.5 (enabling) and §3.7 (rollback) now state it as two steps — set the variable, then deploy — and say plainly that stopping after the first leaves docling running. This is the change worth reviewing: an operator rolling back under pressure could previously have set the variable, walked away, and believed shadow extraction was off while it was still running.Worker memory limit and observed peak — answered, and the precondition passes with a wide margin. Read from the production
workerservice over a 7-day window (10,081 samples): limit 24 GB, peak 0.566 GB, average 0.139 GB, so roughly 23.4 GB of headroom against the ~1.5 GiB docling needs — about fifteen times over. §3.2 now records that measurement as a baseline and requires a fresh busy-window headroom check before every shadow enablement and after any worker-image, workload, concurrency, plan, or resource-limit change.A trap those same numbers invite, pre-empted in §3.2. The service reports a 24 vCPU limit while Gate B measured 9–19 s/doc on 2 CPUs. The §3.4 cost model must not be assumed to scale down proportionally: docling runs eager (
TORCHDYNAMO_DISABLE=1) and single-process, so extra cores may buy little. §3.4 stands until realwall_msvalues say otherwise.Queues an
issues:updaterequest for#1VFSYFrecording exactly which two unknowns closed, with their evidence, and which two remain.What is deliberately not done
Both remaining unknowns need an owner decision rather than investigation, so neither is resolved here:
>10 %timeout rollback trigger is still unratified. That number was proposed in the original runbook PR as a starting point; nothing in the repository fixes it, and it is labelled as a proposed operating rule rather than a measurement. It needs the owner to ratify or replace it, ideally once realwall_msdata exists.documents.metadata.shadow_extractionwas built. Recommendation recorded against the issue: build it when shadow mode is first enabled, not now. Shadow mode has never run, so the key holds zero rows across the corpus, and any such script could not be exercised end-to-end against real data — it would be provider-touching code shipped on the strength of nothing. The runbook already carries a working read-only SQL query for the interim (§3.6).Also out of scope and explicitly untouched:
#BSBE9B(docling-lab-fixtures.v2) is not a small fix. The fixture generator already supports unruled tables,colSpan/rowSpanand rotated headers, so authoring is tractable — but the deliverable is a benchmark whose value is being hard enough to separate the two engines, and validating it requires an owner-approved hosted lab dispatch. Authoring fixtures that are never run would manufacture false confidence.Verification
npm run docs:check-links— the gate that covers this scope, run on the working tree before commit:Prettier on both changed files before the commit; the inbox request was already conformant:
Verification not run:
npm run verify:pr-localin full. The original scope was documentation plus an immutable inbox request; review follow-up also updates the worker's startup text so it names the complete rollback. CI remains the execution evidence.check:ledger-write-disciplineis the one that matters for the inbox file and it runs inStatic PR checks— this branch adds a request and reconciles nothing, which is the case that guard passes cleanly.npm run verify:ui— UI verification not run: no UI, routing, styling or browser behaviour changed.npm run verify:release,eval:retrieval:quality,eval:rag,check:production-readiness,check:deployment-readiness— Verification not run: no retrieval, ranking, answer-generation, clinical, environment, Supabase or deployment behaviour changed, and each is provider-backed.Risk and rollout
git revertthe single commit.list-projects,list-services,get-service-metrics, and a documentation search. No variable was set, no deployment triggered, no service configuration altered. The project id resolved to5deaad0b-675a-4c13-978e-5ca2b5b877f9, matching the one pinned inAGENTS.md.Clinical Governance Preflight
Not applicable, and not required by policy:
classifyPullRequestFilesreturnsclinicalRisk: falsefor this diff. It touchesdocs/worker-deploy-runbook.md, onedocs/outstanding-issues-inbox/*.jsonrequest, and the worker's shadow-mode startup message. It changes no ingestion, answer-generation, search, source-rendering, document-access, privacy or production behaviour. It documents an existing, default-off worker flag.Notes
#1VFSYFupdate is queued as an immutable inbox request rather than an edit to the canonical ledger, so it applies at the next reconciliation.Summary by CodeRabbit