From 204af900ddcd58fc68ecf57593a98dddec12f36d Mon Sep 17 00:00:00 2001
From: Lars Trieloff <lars@trieloff.net>
Date: Mon, 4 Mar 2024 12:20:41 +0100
Subject: [PATCH] feat(resources): add missingresource checkpoint behind
 feature toggle

---
 src/index.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/index.js b/src/index.js
index 6f219a2..9b7c31d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -167,5 +167,13 @@ const observer = new PerformanceObserver((list) => {
     .forEach((entry) => {
       sampleRUM('loadresource', { source: entry.name, target: Math.round(entry.duration) });
     });
+  if (window.origin === 'business.adobe.com') {
+    // feature flagged for now
+    list.getEntries()
+      .filter((entry) => entry.responseStatus === 404)
+      .forEach((entry) => {
+        sampleRUM('missingresource', { source: entry.name, target: entry.hostname });
+      });
+  }
 });
 observer.observe({ type: 'resource', buffered: true });