From fab16d09799787693e78ad1fbd4f0917c2c86299 Mon Sep 17 00:00:00 2001
From: Thomas Kaul <4159106+dtslvr@users.noreply.github.com>
Date: Thu, 23 Jul 2026 17:45:58 +0200
Subject: [PATCH] Task/add stack trace logging for MaxListenersExceededWarning
 (#7400)

* Add stack trace logging for MaxListenersExceededWarning

* Update changelog
---
 CHANGELOG.md         | 4 ++++
 apps/api/src/main.ts | 9 +++++++++
 2 files changed, 13 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f936dd472..3b0b0a418 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Added
+
+- Added the stack trace logging for `MaxListenersExceededWarning` occurrences
+
 ### Changed
 
 - Refactored the deprecated animation providers (`provideAnimations()` and `provideNoopAnimations()`)
diff --git a/apps/api/src/main.ts b/apps/api/src/main.ts
index 77d571ea0..b30a20323 100644
--- a/apps/api/src/main.ts
+++ b/apps/api/src/main.ts
@@ -26,6 +26,15 @@ import { AppModule } from './app/app.module';
 import { environment } from './environments/environment';
 
 const logger = new Logger('Bootstrap');
+const processWarningLogger = new Logger('ProcessWarning');
+
+process.on('warning', ({ name, stack }) => {
+  if (name === 'MaxListenersExceededWarning') {
+    // Log the stack trace of MaxListenersExceededWarning occurrences to identify
+    // the event emitter and the call site which registers the listeners
+    processWarningLogger.warn(stack);
+  }
+});
 
 async function bootstrap() {
   // Respect HTTP_PROXY / HTTPS_PROXY / NO_PROXY for outbound HTTP requests