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ADR 0131: everything on the mesh speaks to the broker seat, and AMQP is not a provision

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Taken during the outage of 2026-09-27, when the protocol leaked into the seat's
contract: to hold mesh-broker a module had to provide amqp, so the module that
will carry the bus could not hold the seat that names the bus, while the module
being retired could. Supersedes 0127. Modules depend on the seat and reach the
bus through the sdk; no manifest provides or requires amqp; the old broker's
module and the two modules that required it leave the catalogue; the AMQP
transport is deleted once every node reports on the new bus.

Design 28 step 5 rewritten under it: the seat handover becomes its own task and
is built first, because the seat the control plane dereferences cannot be empty
in between — that emptiness was the outage. The cost note now carries what was
measured rather than what was assumed.

0128 and 0130 extended 0127; each now rests on 0131 with a dated note and
changes nothing it decided. Every other citation of 0127 names its replacement.
records.py still fails on 0120/0112, which predates this branch.
This commit is contained in:
jschoubben
2026-09-27 23:03:05 +02:00
parent 7ae711ba0b
commit 784b487bf9
10 changed files with 156 additions and 41 deletions
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02-DECISIONS/README.md
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@@ -135,10 +135,11 @@ python3 00-META/checks/index.py fail if stale
- **0116** — [The bus is built in five steps, and the protocol moves with it](0116-the-bus-is-built-in-five-steps.md)
- **0119** — [A taken tunnel's predecessor is retired once the take is proven](0119-a-taken-tunnels-predecessor-is-retired.md)
- **0125** — [The bus is the only broker](0125-the-bus-is-the-only-broker.md) *(superseded)*
- **0127** — [AMQP is a provision, not the bus](0127-amqp-is-a-provision-not-the-bus.md)
- **0127** — [AMQP is a provision, not the bus](0127-amqp-is-a-provision-not-the-bus.md) *(superseded)*
- **0128** — [The mesh bus is required, not ambient](0128-the-mesh-bus-is-required-not-ambient.md)
- **0129** — [A seat carries the protocol of its role](0129-a-seat-carries-the-protocol-of-its-role.md)
- **0130** — [The predecessor is ending, and its broker goes with it](0130-the-predecessor-is-ending-and-its-broker-goes-with-it.md)
- **0131** — [Everything on the mesh speaks to the broker seat, and AMQP is not a provision](0131-everything-on-the-mesh-speaks-to-the-broker-seat.md)
### Its tiers, from the bottom up