From 2614acdada4aab2d10f896ef627bff882f2bf2b8 Mon Sep 17 00:00:00 2001
From: Okan Sahin <39759830+mokimo@users.noreply.github.com>
Date: Thu, 13 Jun 2024 18:08:33 +0200
Subject: [PATCH] Increase 404 rum tracking to 10% (#2448)

* Increase 404 rum tracking to 10%

* Address feedback

* Address feedback

* Increase the general tracking weight for 404 pages

* Increase tracking for 404s

* Improve ID creation

* Use getMetadata
---
 libs/scripts/scripts.js |  2 ++
 libs/utils/samplerum.js | 13 +++++++------
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/libs/scripts/scripts.js b/libs/scripts/scripts.js
index 154e81967c..3fce88cd92 100644
--- a/libs/scripts/scripts.js
+++ b/libs/scripts/scripts.js
@@ -14,6 +14,7 @@ import {
   loadArea,
   loadLana,
   setConfig,
+  getMetadata,
 } from '../utils/utils.js';
 
 // Production Domain
@@ -161,6 +162,7 @@ const eagerLoad = (img) => {
 }());
 
 (async function loadPage() {
+  if (getMetadata('template') === '404') window.SAMPLE_PAGEVIEWS_AT_RATE = 'high';
   performance.mark('loadpage');
   setConfig(config);
   loadLana({ clientId: 'milo' });
diff --git a/libs/utils/samplerum.js b/libs/utils/samplerum.js
index 652a13bd06..58f0ec07aa 100644
--- a/libs/utils/samplerum.js
+++ b/libs/utils/samplerum.js
@@ -28,11 +28,12 @@ export function sampleRUM(checkpoint, data = {}) {
   try {
     window.hlx = window.hlx || {};
     if (!window.hlx.rum) {
-      const usp = new URLSearchParams(window.location.search);
-      const weight = (usp.get('rum') === 'on') ? 1 : 100; // with parameter, weight is 1. Defaults to 100.
-      const id = Array.from({ length: 75 }, (_, i) => String.fromCharCode(48 + i)).filter((a) => /\d|[A-Z]/i.test(a)).filter(() => Math.random() * 75 > 70).join('');
-      const random = Math.random();
-      const isSelected = (random * weight < 1);
+      const weight = (window.SAMPLE_PAGEVIEWS_AT_RATE === 'high' && 10)
+      || (window.SAMPLE_PAGEVIEWS_AT_RATE === 'low' && 1000)
+      || (new URLSearchParams(window.location.search).get('rum') === 'on' && 1)
+      || 100;
+      const id = Math.random().toString(36).slice(-4);
+      const isSelected = (Math.random() * weight < 1);
       const firstReadTime = Date.now();
       const urlSanitizers = {
         full: () => window.location.href,
@@ -44,7 +45,7 @@ export function sampleRUM(checkpoint, data = {}) {
       rumSessionStorage.pages = rumSessionStorage.pages ? rumSessionStorage.pages + 1 : 1;
       sessionStorage.setItem(SESSION_STORAGE_KEY, JSON.stringify(rumSessionStorage));
       // eslint-disable-next-line object-curly-newline, max-len
-      window.hlx.rum = { weight, id, random, isSelected, firstReadTime, sampleRUM, sanitizeURL: urlSanitizers[window.hlx.RUM_MASK_URL || 'path'], rumSessionStorage };
+      window.hlx.rum = { weight, id, isSelected, firstReadTime, sampleRUM, sanitizeURL: urlSanitizers[window.hlx.RUM_MASK_URL || 'path'], rumSessionStorage };
     }
 
     const { weight, id, firstReadTime } = window.hlx.rum;