feat(gatsby): capture number of ssg,dsg,ssr pages in telemetry (#33337)

Author: pieh

packages/gatsby-telemetry/src/index.ts

@@ -89,7 +89,10 @@ export function aggregateStats(data: Array<number>): IAggregateStats {
   return instance.aggregateStats(data)
 }
 
-export function addSiteMeasurement(event: string, obj): void {
+export function addSiteMeasurement(
+  event: string,
+  obj: ITelemetryTagsPayload["siteMeasurements"]
+): void {
   instance.addSiteMeasurement(event, obj)
 }
 

packages/gatsby-telemetry/src/telemetry.ts

@@ -108,6 +108,9 @@ export interface ITelemetryTagsPayload {
     bundleStats?: unknown
     pageDataStats?: unknown
     queryStats?: unknown
+    SSRCount?: number
+    DSGCount?: number
+    SSGCount?: number
   }
   errorV2?: IStructuredErrorV2
   valueString?: string

packages/gatsby/src/commands/build.ts

@@ -380,10 +380,28 @@ module.exports = async function build(program: IBuildArgs): Promise<void> {
   await waitMaterializePageMode
   const waitWorkerPoolEnd = Promise.all(workerPool.end())
 
-  telemetry.addSiteMeasurement(`BUILD_END`, {
-    pagesCount: toRegenerate.length, // number of html files that will be written
-    totalPagesCount: store.getState().pages.size, // total number of pages
-  })
+  {
+    let SSGCount = 0
+    let DSGCount = 0
+    let SSRCount = 0
+    for (const page of store.getState().pages.values()) {
+      if (page.mode === `SSR`) {
+        SSRCount++
+      } else if (page.mode === `DSG`) {
+        DSGCount++
+      } else {
+        SSGCount++
+      }
+    }
+
+    telemetry.addSiteMeasurement(`BUILD_END`, {
+      pagesCount: toRegenerate.length, // number of html files that will be written
+      totalPagesCount: store.getState().pages.size, // total number of pages
+      SSRCount,
+      DSGCount,
+      SSGCount,
+    })
+  }
 
   const postBuildActivityTimer = report.activityTimer(`onPostBuild`, {
     parentSpan: buildSpan,

packages/gatsby/src/commands/develop-process.ts

@@ -48,9 +48,25 @@ if (process.send) {
 }
 
 onExit(() => {
+  let SSGCount = 0
+  let DSGCount = 0
+  let SSRCount = 0
+  for (const page of store.getState().pages.values()) {
+    if (page.mode === `SSR`) {
+      SSRCount++
+    } else if (page.mode === `DSG`) {
+      DSGCount++
+    } else {
+      SSGCount++
+    }
+  }
+
   telemetry.trackCli(`DEVELOP_STOP`, {
     siteMeasurements: {
       totalPagesCount: store.getState().pages.size,
+      SSRCount,
+      DSGCount,
+      SSGCount,
     },
   })
 })