Message Broker / Operational Dependency
Kind: tension
Record: tension:message-broker-operational-dependency
Canonical: Schema
"message-broker" (execution-core layer) is traded against "Operational Dependency" (execution-core layer) — a principle cannot be scope-separated from a quality, metric, or cost it competes with; resolve by measuring "Operational Dependency" and choosing an explicit operating point.
Listed in Tensions, after Message Queue / Latency and before Event Bus / Event Storm / Traceability.