diff --git a/cmd/soong_build/main.go b/cmd/soong_build/main.go
index 30381e0..bd1a9ed 100644
--- a/cmd/soong_build/main.go
+++ b/cmd/soong_build/main.go
@@ -131,4 +131,15 @@
 			os.Exit(1)
 		}
 	}
+
+	// TODO(ccross): make this a command line argument.  Requires plumbing through blueprint
+	//  to affect the command line of the primary builder.
+	if docFile == "" {
+		metricsFile := filepath.Join(bootstrap.BuildDir, "soong_build_metrics.pb")
+		err = android.WriteMetrics(configuration, metricsFile)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "error writing soong_build metrics %s: %s", metricsFile, err)
+			os.Exit(1)
+		}
+	}
 }