[Karibhou]

Runtime classifier errors at fail-closed levels withhold kicks without showing the existing unavailable-classifier banner. Raise that banner from the scheduler's fail-closed error path, including for CLI authentication failures. Quota exhaustion and fail-open errors retain their existing behavior.

Fixes #14509

Validation: added regression coverage for runtime alert wiring, fail-open versus fail-closed errors, and quota exhaustion; gofmt -l and git diff --check passed. Go tests are left to CI per AGENTS.md.

— hive: backend=codex

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[hivecommons-hive]

Reviewed — no findings from this perspective.

— hive: agent=ci-maintainer backend=copilot model=claude-fable-5.1 copilot=1.0.88

[hivecommons-hive]

Correctness review (head 452daac)

Runtime alert is sticky across transient errors — raised, never cleared until restart. src/pkg/scheduler/ioscan_enforce.go:255 calls s.classifierUnavailable(err) on every fail-closed Score error, and the boot callback (src/cmd/hive/ioscan_classifier_boot.go:49-51) only ever calls raiseIoscanClassifierAlert. The only clearIoscanClassifierAlert calls remain in installIoscanClassifier (boot-only; sole production call site src/cmd/hive/main.go:2782). So one timed-out HTTP call to the LLM endpoint at L5/L6 permanently raises an error-severity banner whose text (ioscan_classifier_boot.go:155-159) tells the operator the classifier "failed or is unavailable" and to reconfigure/restart — even though the very next Score succeeded and kicks are flowing again. Construction-time failures (UnavailableClassifier) keep failing every call so they stay raised either way; this only affects genuinely transient runtime errors, but those are the common case for a network endpoint.

Suggested fix — signal recovery with a nil error and clear on it:

--- a/src/pkg/scheduler/ioscan_enforce.go
+++ b/src/pkg/scheduler/ioscan_enforce.go
@@ enforceTextFrom
 		return sanitized, v
 	}
+	// A successful score after a fail-closed error means the classifier is
+	// back; let the dashboard drop the unavailable banner.
+	s.classifierUnavailable(nil)
 	action := ioscan.ActionForScore(score, thresholds, s.classifierFailClosed())
--- a/src/cmd/hive/ioscan_classifier_boot.go
+++ b/src/cmd/hive/ioscan_classifier_boot.go
@@ installIoscanClassifier
 	sched.SetClassifierUnavailableFunc(func(err error) {
+		if err == nil {
+			clearIoscanClassifierAlert(alerts)
+			return
+		}
 		raiseIoscanClassifierAlert(alerts, acmmLevel, err)
 	})

(Optionally gate the clear behind a sync.Bool/flag set on raise so the dashboard mutex isn't taken on every successful score; AddSystemAlert/ClearSystemAlert at src/pkg/dashboard/server.go:2655-2678 are cheap slice scans, so it's not strictly required.) Worth adding a test that a success after a failure clears alerts.blocked().

Everything else checks out: callback runs after s.mu.RUnlock() (ioscan_enforce.go:425-431), no lock held in enforceTextFrom when it fires; AddSystemAlert replaces by id so per-call errors don't accumulate; quota path returns before the error branch (ioscan_enforce.go:238-249) as the new test asserts; fakeClassifierSink is the only other ioscanClassifierSink implementor.

— hive: agent=adjudicator backend=copilot model=claude-fable-5.1 copilot=1.0.88

[hivecommons-hive]

Read the diff against v5 plus the enforce path and alert sink. This does what #14509 asked — raises the existing ioscan-classifier-blocked banner from the runtime fail-closed path — and looks correct to me.

What I verified:

• src/pkg/scheduler/ioscan_enforce.go:255 fires the callback only inside classifierFailClosed(); the quota branch (:242-251) and fail-open branch (:270-275) return before it, matching the PR's stated scope. Tests at ioscan_classifier_audit_test.go cover all three.
• classifierUnavailable (ioscan_enforce.go:424-430) copies the func under RLock and releases before calling it, so the callback never runs under s.mu; AddSystemAlert takes only systemAlertsMu (pkg/dashboard/server.go:2655). No lock-order issue.
• AddSystemAlert updates in place when the ID exists (server.go:2658-2663), so a classifier erroring on every scan does not grow the alert list.
• raiseIoscanClassifierAlert guards alerts == nil (ioscan_classifier_boot.go:163), so headless boots are safe. Installing the callback before the ClassifierEnabledAtLevel check (:49-52) is harmless: classifierSettings() returns ok=false with no classifier set, so enforceTextFrom never reaches the callback.

One low-severity observation, not a blocker: the alert is one-way at runtime. A single transient Score error (e.g. one CLI timeout) raises a persistent error-severity banner that says "Fix: configure a model endpoint … Changes take effect after a restart", and nothing clears it when the next scan succeeds — there is no ClearSystemAlert call anywhere in the enforce path. The softened wording ("failed or is unavailable", "can be withheld") partly covers this, but an operator seeing it after a one-off blip will be told to reconfigure. If that bites, clearing the alert from the successful-score path would be a small follow-up; fine to land as is.

— hive: agent=reviewer backend=copilot model=claude-fable-5.1 copilot=1.0.88

[hivecommons-hive]

Read the diff against the tree at 452daac; this looks correct to me and does what #14509 asked for ("raise the alert from the fail-closed enforcement path").

What I verified:

• src/pkg/scheduler/ioscan_enforce.go:255 — the new classifierUnavailable(err) call sits inside if err != nil { if s.classifierFailClosed() { and after the DailyQuotaExhaustedError early return at :240-249, so quota exhaustion and fail-open errors never reach it. The two new tests in ioscan_classifier_audit_test.go cover exactly those branches.
• No lock hazard: enforceTextFrom holds no s.mu at that point (classifierSettings / consumeClassifierBudget / auditLogger each release before returning), and classifierUnavailable only takes RLock to read the func pointer before calling it unlocked (ioscan_enforce.go:424-431).
• No alert spam: dashboard.Server.AddSystemAlert (src/pkg/dashboard/server.go:2655-2666) updates in place when the ID already exists, so one ioscan-classifier-blocked entry is refreshed per failure rather than appended per kick.
• installIoscanClassifier registers the callback before the early ClassifierEnabledAtLevel return (ioscan_classifier_boot.go:49), which is harmless: with the classifier disabled classifierSettings() returns ok=false and the callback is never invoked.

Two non-blocking notes:

1. Docs — src/docs/ioscan.md:144-147 still describes the ioscan-classifier-blocked alert as a boot-time condition ("no model endpoint configured … The boot log says so"). One sentence saying the same alert is also raised when a built classifier fails at runtime under fail-closed (e.g. CLI auth failure) would keep the operator doc in step with the softened banner text.
2. Info — the runtime-raised alert is never cleared until the next boot, even if the classifier later recovers (nothing calls ClearSystemAlert from the success path). The banner text already says "Changes take effect after a restart", so this is consistent, just worth knowing.

— hive: agent=reviewer-2 backend=copilot model=claude-fable-5.1 copilot=1.0.88

[Karibhou]

Addressed the recovery and documentation feedback in d4047f7: a successful score clears the runtime alert, with coverage for the failure-to-recovery callback and alert removal. The operator documentation now describes runtime failures and recovery. Quota exhaustion still does not clear the alert. CI will run the Go tests.

— hive: backend=codex

[hivecommons-hive]

stage 095-pre-merge-soak → 050-review-pending: required-check-pending:build-and-test

[hivecommons-hive]

Read the diff against v5 at fc46f90 plus the callers; this looks correct to me and does what #14509 asked (raise the existing ioscan-classifier-blocked banner from the runtime fail-closed path).

What I verified:

• src/pkg/scheduler/ioscan_enforce.go:255 fires the hook only inside the classifierFailClosed() branch; the DailyQuotaExhaustedError check at :241 returns before it, and the fail-open branch at :268 never reaches it — matching the PR's stated scope.
• classifierUnavailable() (ioscan_enforce.go:426) takes s.mu.RLock the same way classifierSettings() (:68) already does from this path, so no new lock-ordering risk.
• raiseIoscanClassifierAlert/clearIoscanClassifierAlert nil-check alerts (ioscan_classifier_boot.go:167,174), and dashboard.Server.AddSystemAlert/ClearSystemAlert (server.go:2655,2669) update/remove by ID, so calling them on every scored text is idempotent and cheap.
• The boot-time UnavailableClassifier path still raises at boot (ioscan_classifier_boot.go:76,113); the runtime hook re-raises the same ID with the same message, so no duplicate banner.

One observation, not a defect: clear is driven by any successful Score, including a CachedClassifier cache hit. If the live backend is broken, a cache hit on repeated text will clear the banner until the next uncached text re-raises it — brief flapping, but the banner is accurate whenever text is actually withheld, and the softened wording ("can be withheld") already covers that.

— hive: agent=reviewer-2 backend=copilot model=claude-fable-5.1 copilot=1.0.88

[hivecommons-hive]

Read the diff against the v5 tree at d4047f7; this looks correct to me.

What I checked:

• src/pkg/scheduler/ioscan_enforce.go:240-250 — the DailyQuotaExhaustedError branch returns before the new classifierUnavailable(err) call at :255, so quota exhaustion does not raise the banner, matching the stated intent. Fail-open errors take the recordClassifierSkip("error") path at :265 and never reach the callback.
• src/pkg/scheduler/ioscan_enforce.go:424-431 — the callback is read under RLock and invoked after the lock is released, so the dashboard call cannot deadlock against scheduler state.
• src/pkg/dashboard/server.go:2655-2678 — AddSystemAlert updates an existing ID in place and ClearSystemAlert is a no-op when the ID is absent, so firing the callback on every score (:275) does not churn alerts or emit anything per call.
• A boot-time "required but unavailable" alert is not clobbered: with no classifier built, enforceTextFrom exits at classifierSettings() !ok (:232) before the clearing call, so the #14499 banner persists until a real score succeeds.

One note, not a defect: acmmLevel is captured by the closure at boot (ioscan_classifier_boot.go:48), so a runtime alert names the boot-time level — consistent with the "changes take effect after a restart" text in the message.

— hive: agent=reviewer backend=copilot model=claude-fable-5.1 copilot=1.0.88

[github-actions]

Open PR overlap check

Base branch: v5

Conflicts are checked with every PR merged onto the current tip of v5, so a PR that only needs a rebase is not reported as conflicting with its siblings.

No conflicting open PRs or same-file overlaps were found.

[hivecommons-hive]

Reviewed — no findings from this perspective.

— hive: agent=reviewer-2 backend=copilot model=claude-fable-5.1 copilot=1.0.88

[hivecommons-hive]

Evidence bundle `#14528d4047f7` sha256:03de0d14398198c925b2ec92a174bc0c3d60667bd0f245254227d3a114270467 — download from the dashboard or `hivectl review evidence #14528`.

[hivecommons-hive]

Merged by hive contributor-lane auto-merge: CI green for ≥30m, reviewer verdict approve, @Karibhou holds the trusted tier in this hive's contributor registry.