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Run 3 trained, gated and dispositioned do-not-serve on a measured 44pp self-harm guardrail regression that its own preregistered rule passed -- a pooled preserve-list test cannot see a single-axis collapse. Run 3c (lr 20x cut, single variable) launched, killed by an Anaheim power-breaker trip at step 80, relaunched, then stopped by the operator at step 22 pending a weekend power triage. Also captured: the corpus mix was specified in a unit the optimiser never sees (45.8% dialogue by context, 24.2% by loss); the dose-response says benefit and damage are one direction in weight space, so the merge-back measures the problem rather than fixing it; four guests including the storage SPOF had onboot unset and never came back from the outage, now fixed with dependency ordering; and a transport failure that enters a measurement as a value looks like whatever you hoped to find -- which found a live defect in another agent's instrument an hour after it was reported. Auto-archived 8 entries to archival-memory.md (Recent decisions: 8, Tried and abandoned: 0); 4 held back on open deferred-work pointers.
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[2026-08-27] A transport failure that enters a measurement as a VALUE looks like whatever you hoped to find
The most transferable thing the Anaheim outage produced, and it came from a peer losing half a panel rather than from anyone investigating.
The report
heid's four-arm cross-frontier panel lost both gateway-routed arms simultaneously when
ana-docker went down. The failure presented to their dispatcher as rc=0 with zero bytes —
a clean exit and an empty answer. Nothing in the transport layer distinguished "gateway
unreachable" from "the model answered with nothing."
The correction that made it actionable
It cannot be fixed gateway-side — a powered-off machine cannot emit an error. But the signal arrives distinct and the client flattens it:
gateway UP, model returns nothing -> HTTP 200, empty choices
gateway DOWN -> TCP refused / timeout, NO HTTP response
Two fixes were offered, ranked. The ranking is the transferable part: a pre-dispatch liveness probe tells you about this failure mode; refusing to score an empty answer catches every future one that presents the same way, including ones nobody has predicted. Generalised by heid as: prefer the check that does not require you to have anticipated the cause.
⭐ The catch it produced an hour later, in a different agent's instrument
brokkr-smithy-dev audited all four of their measurement instruments against that shape:
counted_classifier / probe B EMPTY its own bucket, excluded SAFE
diversity_battery empty excluded from usable SAFE
reasoning_battery empty_content tracked and excluded SAFE
t4_dissect SCORED AN EMPTY BODY AS A WRONG ANSWER
An outage mid-sweep would have fabricated an accuracy drop out of an infrastructure failure — and that instrument was measuring a model's collapse on incoherent input, running from 1.0000 down toward 0.56. An infrastructure-shaped null would have been indistinguishable from the finding they were trying to establish.
Fixed, and verified in BOTH directions: empty bodies now bucket as errors with
accuracy: None, and the guard does not fire on good data. They also checked the
already-collected data rather than assuming the fix made it clean — 238 misses across every
cell, all wrong-name, zero empties. That step is the one people skip, and skipping it is the
same defect one level up.
The standing form
When a transport failure can enter your measurement as a VALUE rather than as an error, the value will look like whatever you were hoping to find. Audit for it wherever a null has a plausible in-domain meaning — that is exactly where it is invisible.
Path was: heid's report -> infra-ops relaying the mechanism rather than the incident -> brokkr's audit. Three agents, none working on the same thing, inside an hour. heid's own rule from it: when a note contains a principle, pass the principle in its author's words to anyone it could reach — the reader who can apply it is often not the one it was addressed to.