Testing & Going Live

Server-side has its own debugging surface, and a few habits keep a migration from quietly losing data.

How to test

• Use the server container's Preview, it shows each incoming request, which client claimed it, the event data object, and which tags fired.
• Confirm the destination actually received the event (GA4 DebugView, Meta Events Manager "Test events").
• Check the response sets the expected first-party cookie.
• Watch for events that arrive but are claimed by no client, the usual sign of a misconfigured client or URL.

Rolling out safely

• Run server-side alongside the existing client-side setup first; compare totals before cutting over.
• Expect a modest increase in recorded conversions (recovered from blockers/ITP), not a drop. A drop means something is misrouted.
• Mind cost: Cloud Run scales with traffic, so load-test high-traffic events.