OpenTelemetry

Env	Process	Meaning
VION_OTEL_ENDPOINT	CP / RT	OTLP gRPC endpoint
VITE_OTEL_ENDPOINT	Studio	Browser OTLP HTTP (optional)

Logs: JSON stdout; HTTP responses include x-correlation-id.

When VION_TENANT_ID is set, the runtime StageSnapshot, ActivateSnapshot, and operate spans carry vion.tenant_id (canonical UUID). When it is unset, that attribute is absent.