Optionaloptions: ErrorOptionsReadonlyreasonAn optional machine-readable reason, rendered into the response body alongside the message. DECLARED HERE rather than sniffed structurally at the mapper so the channel is part of the contract a subclass opts into, and so the mapper needs no import of any subclass to render it (see the header for why that import must not exist).
ReadonlystatusThe response status. 4xx/5xx only — see doErrorResponse.
The fence could not be READ. Deliberately distinct from ExecutionFencedError: no state was observed, so nothing may conclude the deployment is open — which is why this carries the same 503 a refusal does and every request-path caller lets it propagate.