diff --git a/lib/init-action.js b/lib/init-action.js
index d459cf358..e267eaab2 100644
--- a/lib/init-action.js
+++ b/lib/init-action.js
@@ -89639,7 +89639,11 @@ async function initConfig(features, inputs) {
   }
   if (await features.getValue("ignore_generated_files" /* IgnoreGeneratedFiles */) && isCCR()) {
     try {
+      const generatedFilesCheckStartedAt = import_perf_hooks.performance.now();
       const generatedFiles = await getGeneratedFiles(inputs.sourceRoot);
+      const generatedFilesDuration = Math.round(
+        import_perf_hooks.performance.now() - generatedFilesCheckStartedAt
+      );
       if (generatedFiles.length > 0) {
         config.computedConfig["paths-ignore"] ??= [];
         config.computedConfig["paths-ignore"].push(...generatedFiles);
@@ -89649,6 +89653,11 @@ async function initConfig(features, inputs) {
       } else {
         logger.info(`Found no generated files.`);
       }
+      await logGeneratedFilesTelemetry(
+        config,
+        generatedFilesDuration,
+        generatedFiles.length
+      );
     } catch (error3) {
       logger.info(`Cannot ignore generated files: ${getErrorMessage(error3)}`);
     }
@@ -89884,6 +89893,25 @@ async function logGitVersionTelemetry(config, gitVersion) {
     );
   }
 }
+async function logGeneratedFilesTelemetry(config, duration, generatedFilesCount) {
+  if (config.languages.length < 1) {
+    return;
+  }
+  addDiagnostic(
+    config,
+    // Arbitrarily choose the first language. We could also choose all languages, but that
+    // increases the risk of misinterpreting the data.
+    config.languages[0],
+    makeTelemetryDiagnostic(
+      "codeql-action/generated-files-telemetry",
+      "Generated files telemetry",
+      {
+        duration,
+        generatedFilesCount
+      }
+    )
+  );
+}
 
 // src/dependency-caching.ts
 var os3 = __toESM(require("os"));
diff --git a/src/config-utils.ts b/src/config-utils.ts
index a77366991..772c187b8 100644
--- a/src/config-utils.ts
+++ b/src/config-utils.ts
@@ -959,7 +959,11 @@ export async function initConfig(
   // the `paths-ignore` configuration.
   if ((await features.getValue(Feature.IgnoreGeneratedFiles)) && isCCR()) {
     try {
+      const generatedFilesCheckStartedAt = performance.now();
       const generatedFiles = await getGeneratedFiles(inputs.sourceRoot);
+      const generatedFilesDuration = Math.round(
+        performance.now() - generatedFilesCheckStartedAt,
+      );
 
       if (generatedFiles.length > 0) {
         config.computedConfig["paths-ignore"] ??= [];
@@ -970,6 +974,12 @@ export async function initConfig(
       } else {
         logger.info(`Found no generated files.`);
       }
+
+      await logGeneratedFilesTelemetry(
+        config,
+        generatedFilesDuration,
+        generatedFiles.length,
+      );
     } catch (error) {
       logger.info(`Cannot ignore generated files: ${getErrorMessage(error)}`);
     }
@@ -1414,3 +1424,32 @@ async function logGitVersionTelemetry(
     );
   }
 }
+
+/**
+ * Logs the time it took to identify generated files and how many were discovered as
+ * a telemetry diagnostic.
+ * */
+async function logGeneratedFilesTelemetry(
+  config: Config,
+  duration: number,
+  generatedFilesCount: number,
+): Promise<void> {
+  if (config.languages.length < 1) {
+    return;
+  }
+
+  addDiagnostic(
+    config,
+    // Arbitrarily choose the first language. We could also choose all languages, but that
+    // increases the risk of misinterpreting the data.
+    config.languages[0],
+    makeTelemetryDiagnostic(
+      "codeql-action/generated-files-telemetry",
+      "Generated files telemetry",
+      {
+        duration,
+        generatedFilesCount,
+      },
+    ),
+  );
+}