Test App 26 — Next.js insights
Instrumented with @vercel/otel. Every request emits Next's native route-templated spans to the Hostess collector.
/products/[id]— dynamic route; server-fetches the backend (cross-service trace)/api/orders/[orderId]— dynamic route handler/slow— slow response (fills latency buckets)/boom— always 500 (error rate + error traces)