Fail Safe / Availability
Kind: tension
Record: tension:availability-fail-safe
Canonical: Schema
"fail-safe" (correctness-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 Fail Fast / Graceful Degradation and before Fail Secure / Availability.