Consensus / Availability
Kind: tension
Record: tension:availability-consensus
Canonical: Schema
"consensus" (execution-core layer) is traded against "Availability" (correctness-core layer) — a principle cannot be scope-separated from a quality, metric, or cost it competes with; resolve by measuring "Availability" and choosing an explicit operating point.
Listed in Tensions, after Consensus / Latency and before Choreography / Traceability.