feat: ship instrumentation file in functions bundle (#1726)

* feat: ship instrumentation file in functions bundle

* chore: update serverless functions api

* chore: fix tests

* chore: latest pr feedback

* chore: add test for bundler none

* chore: update naming

* chore: fix windows

package.json

@@ -57,7 +57,7 @@
     "@babel/parser": "^7.22.5",
     "@babel/types": "7.23.6",
     "@netlify/binary-info": "^1.0.0",
-    "@netlify/serverless-functions-api": "^1.16.2",
+    "@netlify/serverless-functions-api": "^1.17.0",
     "@vercel/nft": "^0.23.0",
     "archiver": "^6.0.0",
     "common-path-prefix": "^3.0.0",

src/feature_flags.ts

@@ -29,6 +29,9 @@ export const defaultFlags = {
 
   // fixes symlinks in included files
   zisi_fix_symlinks: false,
+
+  // Adds the `___netlify-telemetry.mjs` file to the function bundle.
+  zisi_add_instrumentation_loader: true,
 } as const
 
 export type FeatureFlags = Partial<Record<keyof typeof defaultFlags, boolean>>

src/runtimes/node/utils/entry_file.ts

@@ -1,3 +1,5 @@
+import { readFileSync } from 'fs'
+import { createRequire } from 'module'
 import { basename, extname, resolve } from 'path'
 
 import type { FeatureFlags } from '../../../feature_flags.js'
@@ -15,6 +17,9 @@ import { normalizeFilePath } from './normalize_path.js'
 
 export const ENTRY_FILE_NAME = '___netlify-entry-point'
 export const BOOTSTRAP_FILE_NAME = '___netlify-bootstrap.mjs'
+export const TELEMETRY_FILE_NAME = '___netlify-telemetry.mjs'
+
+const require = createRequire(import.meta.url)
 
 export interface EntryFile {
   contents: string
@@ -153,6 +158,17 @@ const getEntryFileName = ({
   return `${basename(filename, extname(filename))}${extension}`
 }
 
+export const getTelemetryFile = (): EntryFile => {
+  // TODO: switch with import.meta.resolve once we drop support for Node 16.x
+  const filePath = require.resolve('@netlify/serverless-functions-api/instrumentation.js')
+  const contents = readFileSync(filePath, 'utf8')
+
+  return {
+    contents,
+    filename: TELEMETRY_FILE_NAME,
+  }
+}
+
 export const getEntryFile = ({
   commonPrefix,
   featureFlags,