Vercel now directly integrates with SvelteKit's new server-side OpenTelemetry spans.

To get started, activate experimental tracing in SvelteKit:

/** @type {import('@sveltejs/kit').Config} */
const config = {
	kit: { 
		experimental: {
			tracing: {
				server: true,
			},
			instrumentation: {
				server: true,
			}
		}
	}
};
export default config;

And create the tracing instrumentation file with the Vercel OpenTelemetry collector:

import { registerOTel } from '@vercel/otel';
registerOTel({
	serviceName: 'my-sveltekit-app'
});

Traces generated during tracing sessions will now include the built-in SvelteKit spans. You can also configure other collectors. See the SvelteKit observability docs for more information.