Event Stream / Storage Volume
Kind: tension
Record: tension:event-stream-storage-volume
Canonical: Schema
"event-stream" (execution-core layer) is traded against "Storage Volume" (execution-core layer) — a principle cannot be scope-separated from a quality, metric, or cost it competes with; resolve by measuring "Storage Volume" and choosing an explicit operating point.
Listed in Tensions, after Event Bus / Event Storm / Traceability and before Event Sourcing / Query Complexity.