From f15544e47ef603cec71640cc81ff7cc0054c557f Mon Sep 17 00:00:00 2001
From: Anthony LC <anthony.le-courric@mail.numerique.gouv.fr>
Date: Thu, 17 Sep 2026 10:30:49 +0200
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B(frontend)=20reduce=20PostHog=20vol?=
 =?UTF-8?q?ume=20from=20web=20vitals=20and=20opt=5Fin=20spam?=
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$opt_in fired on every reconnect since opt_in_capturing() captures an
event by default, even though this call just re-enables tracking after
a network drop and isn't a real consent action. Also disable web
vitals capture, which fed a single low-value insight.
---
 CHANGELOG.md                                               | 1 +
 src/frontend/apps/impress/src/services/PosthogAnalytic.tsx | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c6fda2c1..8b79a534e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to
 ### Added
 
 - ✨(helm) allow disallowing search engine indexing per instance #2694
+- 🐛(frontend) reduce PostHog volume from web vitals and opt_in spam #2701
 
 ### Fixed
 
diff --git a/src/frontend/apps/impress/src/services/PosthogAnalytic.tsx b/src/frontend/apps/impress/src/services/PosthogAnalytic.tsx
index 89e9ede9b..87e13b583 100644
--- a/src/frontend/apps/impress/src/services/PosthogAnalytic.tsx
+++ b/src/frontend/apps/impress/src/services/PosthogAnalytic.tsx
@@ -69,6 +69,7 @@ export function PostHogProvider({
       },
       capture_pageview: false,
       capture_pageleave: true,
+      capture_performance: { web_vitals: false },
     });
 
     const handleRouteChange = () => posthog?.capture('$pageview');
@@ -85,7 +86,7 @@ export function PostHogProvider({
     if (isOffline) {
       posthog.opt_out_capturing();
     } else {
-      posthog.opt_in_capturing();
+      posthog.opt_in_capturing({ captureEventName: false });
     }
   }, [isOffline]);