Replication / Consistency Lag
Kind: tension
Record: tension:consistency-lag-replication
Canonical: Schema
"replication" (correctness-core layer) is traded against "Consistency Lag" (correctness-core layer) — a principle cannot be scope-separated from a quality, metric, or cost it competes with; resolve by measuring "Consistency Lag" and choosing an explicit operating point.
Listed in Tensions, after Redundancy / Cost and before Auto-Scaling / Cost/Cold Start.