add telemetry events for ppr & staleTimes experimental flags

packages/next/src/build/index.ts

@@ -2421,6 +2421,10 @@ export default async function build(
           featureName: 'optimizeFonts',
           invocationCount: config.optimizeFonts ? 1 : 0,
         },
+        {
+          featureName: 'experimental/ppr',
+          invocationCount: config.experimental.ppr ? 1 : 0,
+        },
       ]
       telemetry.record(
         features.map((feature) => {

packages/next/src/telemetry/events/build.ts

@@ -152,8 +152,9 @@ export type EventBuildFeatureUsage = {
     | '@next/font/local'
     | 'next/font/google'
     | 'next/font/local'
-    | 'experimental/optimizeCss'
     | 'experimental/nextScriptWorkers'
+    | 'experimental/optimizeCss'
+    | 'experimental/ppr'
     | 'optimizeFonts'
     | 'swcLoader'
     | 'swcMinify'

packages/next/src/telemetry/events/version.ts

@@ -33,6 +33,8 @@ type EventCliSessionStarted = {
   turboFlag: boolean
   appDir: boolean | null
   pagesDir: boolean | null
+  staticStaleTime: number | null
+  dynamicStaleTime: number | null
 }
 
 function hasBabelConfig(dir: string): boolean {
@@ -79,6 +81,8 @@ export function eventCliSession(
     | 'nextConfigOutput'
     | 'trailingSlashEnabled'
     | 'reactStrictMode'
+    | 'staticStaleTime'
+    | 'dynamicStaleTime'
   >
 ): { eventName: string; payload: EventCliSessionStarted }[] {
   // This should be an invariant, if it fails our build tooling is broken.
@@ -120,6 +124,8 @@ export function eventCliSession(
     turboFlag: event.turboFlag || false,
     appDir: event.appDir,
     pagesDir: event.pagesDir,
+    staticStaleTime: nextConfig.experimental.staleTimes?.static ?? null,
+    dynamicStaleTime: nextConfig.experimental.staleTimes?.dynamic ?? null,
   }
   return [{ eventName: EVENT_VERSION, payload }]
 }

test/e2e/app-dir/app-client-cache/client-cache.experimental.test.ts

@@ -1,5 +1,6 @@
 import { nextTestSetup } from 'e2e-utils'
 import { browserConfigWithFixedTime, fastForwardTo } from './test-utils'
+import { findAllTelemetryEvents } from 'next-test-utils'
 
 describe('app dir client cache semantics (experimental staleTimes)', () => {
   describe('dynamic: 0', () => {
@@ -8,6 +9,9 @@ describe('app dir client cache semantics (experimental staleTimes)', () => {
       nextConfig: {
         experimental: { staleTimes: { dynamic: 0 } },
       },
+      env: {
+        NEXT_TELEMETRY_DEBUG: '1',
+      },
     })
 
     if (isNextDev) {
@@ -167,6 +171,24 @@ describe('app dir client cache semantics (experimental staleTimes)', () => {
         })
       })
     })
+
+    describe('telemetry', () => {
+      it('should send staleTimes feature usage event', async () => {
+        const events = findAllTelemetryEvents(
+          next.cliOutput,
+          'NEXT_CLI_SESSION_STARTED'
+        )
+
+        expect(events).toEqual(
+          expect.arrayContaining([
+            expect.objectContaining({
+              staticStaleTime: null,
+              dynamicStaleTime: 0,
+            }),
+          ])
+        )
+      })
+    })
   })
 
   describe('static: 180', () => {
@@ -175,6 +197,9 @@ describe('app dir client cache semantics (experimental staleTimes)', () => {
       nextConfig: {
         experimental: { staleTimes: { static: 180 } },
       },
+      env: {
+        NEXT_TELEMETRY_DEBUG: '1',
+      },
     })
 
     if (isNextDev) {
@@ -265,5 +290,22 @@ describe('app dir client cache semantics (experimental staleTimes)', () => {
         expect(loadingRandomNumber).not.toBe(newLoadingNumber)
       })
     })
+
+    describe('telemetry', () => {
+      it('should send staleTimes feature usage event', async () => {
+        const events = findAllTelemetryEvents(
+          next.cliOutput,
+          'NEXT_CLI_SESSION_STARTED'
+        )
+        expect(events).toEqual(
+          expect.arrayContaining([
+            expect.objectContaining({
+              staticStaleTime: 180,
+              dynamicStaleTime: null,
+            }),
+          ])
+        )
+      })
+    })
   })
 })

test/e2e/app-dir/ppr/ppr.test.ts

@@ -1,10 +1,13 @@
 import { createNextDescribe } from 'e2e-utils'
-import { check } from 'next-test-utils'
+import { check, findAllTelemetryEvents } from 'next-test-utils'
 
 createNextDescribe(
   'ppr',
   {
     files: __dirname,
+    env: {
+      NEXT_TELEMETRY_DEBUG: '1',
+    },
   },
   ({ next, isNextDev, isNextStart }) => {
     it('should indicate the feature is experimental', async () => {
@@ -24,6 +27,19 @@ createNextDescribe(
           expect(next.cliOutput).toContain('◐ /suspense/node/nested/[slug]')
         })
       })
+
+      describe('telemetry', () => {
+        it('should send ppr feature usage event', async () => {
+          const events = findAllTelemetryEvents(
+            next.cliOutput,
+            'NEXT_BUILD_FEATURE_USAGE'
+          )
+          expect(events).toContainEqual({
+            featureName: 'experimental/ppr',
+            invocationCount: 1,
+          })
+        })
+      })
     }
     describe.each([
       { pathname: '/suspense/node' },