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docs(reliability): document worker overload protection and load monitoring - #37
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…oring Add a concept page for absolute per-worker overload vetoes: signals, flags, per-worker overload blocks, the 503 worker_overload_protection_shed response, default-on load monitoring and the gRPC PD decode admission window (smg-project/smg#2220, #2233, #2417, #2466). Update Cache Management and the extension route table for the cached GET /loads snapshot and gRPC cache flush, including vLLM (smg-project/smg#2418, #2554). Signed-off-by: Simo Lin <25425177+slin1237@users.noreply.github.com>
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WalkthroughThe Reliability concept pages now cover overload protection. The API reference documents cache flushing and the cached fleet-load endpoint, including its response schema and deprecated alias. ChangesReliability Concepts
Cache and Load API Reference
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Other Merge Risk: 🔵 Low · up to Two overload-guide explanations remain misleading. Clarify the mean-threshold example and when a veto can clear; these documentation issues do not appear to block the documented API workflows. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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In `@src/lib/content/concepts/reliability/overload-protection.md`:
- Line 89: Clarify the mean-threshold description in the overload criteria: a
worker is vetoed when its mean token usage reaches or exceeds the threshold,
even if individual DP ranks have headroom; do not describe individual ranks as
being tested independently. Reference the --balance-token-usage-threshold
signal.
- Line 108: Update the overload-verdict explanation to distinguish report-driven
changes from other ways the stored veto can be cleared: a new report changes the
report-based verdict, while leaving Ready, worker removal, or rebuilding monitor
state can clear the veto without a new report.
- Line 207: Update the Retry-After guarantee near the overload-protection
discussion to clarify that a worker group's veto may remain active until its
next poll when load_monitor_interval_secs sets a longer effective interval;
advise clients to wait at least the advertised value and possibly longer.
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src/lib/config/concepts-nav.tssrc/lib/content/concepts/index.mdsrc/lib/content/concepts/reliability/index.mdsrc/lib/content/concepts/reliability/overload-protection.mdsrc/lib/content/reference/api/admin.mdsrc/lib/content/reference/api/extensions.md
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… not applied Worker registration builds each worker with BasicWorkerBuilder::new and never copies load_monitor_interval_secs from the submitted spec, so the monitor's per-group override never sees it in v1.11.0 (create_worker.rs). Signed-off-by: Simo Lin <25425177+slin1237@users.noreply.github.com>
This was referenced Sep 24, 2026
- Use `smg launch` in every example; the pip CLI needs a subcommand. - Describe the token-usage veto as a mean across DP ranks, not a per-rank test. - Only a poll sets the veto. Polls, leaving Ready, removal, replacement (PUT or PATCH), and a monitor rebuild clear it. Align the Retry-After and dispatch re-check wording with that. - Validation note: only 0 vetoes every worker; values above 1.0 are rejected but never veto. - Note that the Python launchers do not accept --engine-metrics. - Alert summary: the shed counter also counts dispatch and pd_admission sheds. - Flush Cache: only HTTP and gRPC workers are called (ZMQ is skipped), and an HTTP failure names the /flush_cache endpoint URL. Signed-off-by: Simo Lin <25425177+slin1237@users.noreply.github.com>
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smg v1.10.0 added absolute per-worker overload vetoes and made load monitoring default-on (smg-project/smg#2220, #2233). v1.11.0 gave overload sheds their own error code (#2417) and started serving
/loadsfrom the load monitor's cached snapshot (#2418). None of this was documented. The Cache Management reference also still described the pre-1.10get_loadsfan-out, and it said gRPC workers are skipped on cache flush.Changes
concepts/reliability/overload-protection.md:least_loadwaiting cap./loadsand/v1/loads, the/metricsfallback, gRPCGetLoads, ZMQ piggybacked load).overloadblocks.503 worker_overload_protection_shedresponse, withRetry-AfterandX-SMG-Error-Code.GET /loads, the deprecated/get_loadsalias, the v1.11 response schema, and the breaking change from the oldworkers[]shape./loadsand the auth tier of each route.reliability/index.mdgets the frontmatter it was missing.Verification
v1.11.0(3be823a7), mainlymain.rs,worker/monitor.rs,worker/overload.rs,routers/common/overload.rs,routers/common/pd_admission.rs,crates/external_router/src/error.rs,server.rs, andcrates/protocols/src/worker.rs.pnpm lint,pnpm check(0 errors; the pre-existing HeroMark warning remains), andpnpm buildpass.configuration.md#worker-overload-protectionand#load-monitoring-configuration. The configuration-reference PR in this series adds those anchors.wrangler pages devrenders all five changed pages with status 200, admonitions, card grids, and tables intact, plus the new nav entry.This is part of a series of docs PRs that bring the site up to smg v1.11.0, one per area.
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