feat(gatsby): distinguish total number of pages from number of written html files (#29149)

Author: pieh

packages/gatsby-telemetry/src/telemetry.ts

@@ -475,7 +475,10 @@ export class AnalyticsTracker {
     this.metadataCache[event] = Object.assign(cached, obj)
   }
 
-  addSiteMeasurement(event: string, obj): void {
+  addSiteMeasurement(
+    event: string,
+    obj: ITelemetryTagsPayload["siteMeasurements"]
+  ): void {
     const cachedEvent = this.metadataCache[event] || {}
     const cachedMeasurements = cachedEvent.siteMeasurements || {}
     this.metadataCache[event] = Object.assign(cachedEvent, {

packages/gatsby/src/commands/build-html.ts

@@ -2,7 +2,6 @@ import Bluebird from "bluebird"
 import fs from "fs-extra"
 import reporter from "gatsby-cli/lib/reporter"
 import { createErrorFromString } from "gatsby-cli/lib/reporter/errors"
-import telemetry from "gatsby-telemetry"
 import { chunk } from "lodash"
 import webpack from "webpack"
 
@@ -182,10 +181,6 @@ export const doBuildPages = async (
   activity: IActivity,
   workerPool: IWorkerPool
 ): Promise<void> => {
-  telemetry.addSiteMeasurement(`BUILD_END`, {
-    pagesCount: pagePaths.length,
-  })
-
   try {
     await renderHTMLQueue(workerPool, activity, rendererPath, pagePaths)
   } catch (error) {

packages/gatsby/src/commands/build.ts

@@ -246,6 +246,11 @@ module.exports = async function build(program: IBuildArgs): Promise<void> {
     buildSSRBundleActivityProgress.end()
   }
 
+  telemetry.addSiteMeasurement(`BUILD_END`, {
+    pagesCount: pagePaths.length, // number of html files that will be written
+    totalPagesCount: store.getState().pages.size, // total number of pages
+  })
+
   const buildHTMLActivityProgress = report.createProgress(
     `Building static HTML for pages`,
     pagePaths.length,

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

@@ -50,7 +50,7 @@ if (process.send) {
 onExit(() => {
   telemetry.trackCli(`DEVELOP_STOP`, {
     siteMeasurements: {
-      pagesCount: store.getState().pages.size,
+      totalPagesCount: store.getState().pages.size,
     },
   })
 })