[PoC] feat: Add support for server-side instrumentation

[Lms24]

See #13775

This PR adds minimal adaption for SvelteKit to support registering ESM server-side instrumentation in a dedicated instrument.server.ts file prior to SvelteKit's server being bootstrapped.

Concrete changes:

• @sveltejs/kit
  • add instrument.server.(js|ts) to file output (s.t. it can be transpiled)
• @sveltejs/adapter-node
  • add transpiled instrument.server.js to secondary server build
  • add dynamic import of instrument.server.js (if available) to server entry

Usage

// instrument.server.ts

// add arbitrary instrumentation code here, for example:
import { NodeSDK } from "@opentelemetry/sdk-node";
import { getNodeAutoInstrumentations } from "@opentelemetry/auto-instrumentations-node";
import { OTLPTraceExporter } from "@opentelemetry/exporter-trace-otlp-proto";
import { createAddHookMessageChannel } from "import-in-the-middle";
import { register } from "module";

const { registerOptions, waitForAllMessagesAcknowledged } =
  createAddHookMessageChannel();
register("import-in-the-middle/hook.mjs", import.meta.url, registerOptions);

const sdk = new NodeSDK({
  serviceName: "demo-todo-app",
  traceExporter: new OTLPTraceExporter(),
  instrumentations: [getNodeAutoInstrumentations()],
});

sdk.start();

await waitForAllMessagesAcknowledged();

---

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-kit-13776-svelte.vercel.app/