Queue overflow: stop, do not silent-drop

Queue overflow is a money event, not a quiet buffer trim. When depth or age crosses the named line, fail closed with countable status — never silent-drop intents product still calls “queued” and finance cannot find. This page is that overflow stop contract, not a DLR retry essay and not an undelivered/rejected dictionary.

Related: Rate-limit gate before you allow bursts, Pilot throughput: honest ceiling, Wallet stop-lines before production, Missing signal is not Delivered, Shared status language for product and finance.

IOSOR is white-label prepaid. USD 20 funds overflow-stop smoke on one queue; soft review near USD 1,000/month prices silent loss as recon debt. Clients see white-label overflow statuses only.

Overflow is fail-closed, not “drop the oldest”

Silent-drop of the oldest row, or truncating without a status row, trains buyers to trust a lie. Fail closed: new intents get overflow/rejected class, holds release or refund per policy, nothing invents Delivered for a message that never left. Soft USD 1,000/month treats “we just dropped lag” as an incident; USD 20 proves one forced overflow stops with honest status. Align with the burst gate: Rate-limit gate before you allow bursts.

What overflow must surface

Never map queue silence to Delivered (Missing signal is not Delivered). Shared words beat hero codes: Shared status language for product and finance. Ceiling and stop-lines stay aligned: Pilot throughput: honest ceiling, Wallet stop-lines before production.

Prepaid protection before depth climbs

Holds and stop-lines arm before marketing opens volume. Overflow that still settles spend for dropped intents is silent burn. Product: can overflowed intent show success? Finance: spend for a row that never left? Ops: queue, depth/age line, UTC window? Soft volume language stays blocked while forced overflow paints success or leaves no exportable row.

Owner who raises depth — and who stops

Name who may raise depth or age thresholds, and who owns the stop when the line trips. Folklore owners at 02:00 bring silent-drop back.

Buyer checklist for queue overflow stops

1. Depth and age lines written — not oral?
2. Overflow fails closed with countable status — no silent-drop?

Start with IOSOR

Set explicit queue depth and age thresholds in the IOSOR console before launching high-volume dispatch routines. Route all gate overflow events directly to a fail-closed status webhook so unserviced traffic logs an immediate overflow or rejected state. Verify that hold-release triggers automatically unreserve balance when message age limits expire at the gate.

IOSOR takeaway

Silently dropping aged records or truncating queues without status feedback destroys billing integrity and misleads delivery metrics. A fail-closed queue architecture ensures every message intent receives a countable status, preventing un-routed traffic from ever settling spend as a successful delivery.