fix: skip queue metrics setup if no database is connected (#371)

Currently, queue.js will try to register the `.after` handler for
collecting queue metrics even if the CAP app does not have a database,
resulting in a crash on startup.

---------

Co-authored-by: sjvans <[email protected]>
Co-authored-by: D050513 <[email protected]>

Author: PDT42

CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
+## Version 1.5.3 - 2025-09-01
+
+### Fixed
+
+- Skip persistent queue metrics setup if no database is connected
+
 ## Version 1.5.2 - 2025-08-18
 
 ### Fixed

lib/metrics/queue.js

@@ -161,6 +161,11 @@ module.exports = () => {
   const registeredServics = new Set()
 
   cds.on('listening', () => {
+    if (!cds.db) {
+      cds.log('telemetry').debug('Skipping queue metrics setup as no database is connected')
+      return
+    }
+
     const queueEntity = cds.model.definitions[PERSISTENT_QUEUE_DB_NAME]
     if (!queueEntity) return
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@cap-js/telemetry",
-  "version": "1.5.2",
+  "version": "1.5.3",
   "description": "CDS plugin providing observability features, incl. automatic OpenTelemetry instrumentation.",
   "repository": {
     "type": "git",