Observer Pattern / Debuggability
Kind: tension
Record: tension:debuggability-observer-pattern
Canonical: Schema
"observer-pattern" (design-patterns-core layer) is traded against "Debuggability" (observability layer) — a principle cannot be scope-separated from a quality, metric, or cost it competes with; resolve by measuring "Debuggability" and choosing an explicit operating point.
Listed in Tensions, after Observer Pattern / Ordering and before Mediator Pattern / Mediator God Object.