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Design 28: 5.3 is built and was used for the hand-over

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jschoubben
2026-09-28 02:28:06 +02:00
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03-DESIGN/01-to-be/28-building-the-bus.md
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@@ -674,10 +674,12 @@ healthy while reacting to nothing.
server, and the controller binary was run on the node directly until the managed container server, and the controller binary was run on the node directly until the managed container
could be rebuilt over the bus it was on. could be rebuilt over the bus it was on.
- [ ] 5.3 **the seat changes hands as one act.** A command takes a seat and the assignment taking it - [x] 5.3 **the seat changes hands as one act.** A command takes a seat and the assignment taking it
over, and the seat is never empty in between — the emptiness is the outage of 2026-09-27, when over, and the seat is never empty in between — the emptiness is the outage of 2026-09-27, when
the control plane, which finds its own bus through this seat, lost the address and looped. the control plane, which finds its own bus through this seat, lost the address and looped.
Today only `seat rename` exists. This is what 5.2 uses to move `mesh-broker` from the old **Built 2026-09-27** (`seat_holding`, migration 0039; design 26 says how it is checked), and used
live the next night to hand `mesh-broker` from the old broker's assignment to the new one's. This
is what 5.2 uses to move `mesh-broker` from the old
broker's assignment to the new one's, and it is built first ([ADR 0131](../../02-DECISIONS/0131-everything-on-the-mesh-speaks-to-the-broker-seat.md)). broker's assignment to the new one's, and it is built first ([ADR 0131](../../02-DECISIONS/0131-everything-on-the-mesh-speaks-to-the-broker-seat.md)).
- [x] 5.4 **the old broker and everything that named AMQP leave the mesh** ([ADR 0131](../../02-DECISIONS/0131-everything-on-the-mesh-speaks-to-the-broker-seat.md), - [x] 5.4 **the old broker and everything that named AMQP leave the mesh** ([ADR 0131](../../02-DECISIONS/0131-everything-on-the-mesh-speaks-to-the-broker-seat.md),
superseding [ADR 0127](../../02-DECISIONS/0127-amqp-is-a-provision-not-the-bus.md)): the two modules that superseding [ADR 0127](../../02-DECISIONS/0127-amqp-is-a-provision-not-the-bus.md)): the two modules that