update documentation to register metrics once

Signed-off-by: Fredrik Adelöw <freben@gmail.com>
2025-04-25 13:00:45 +02:00
parent 0800aa5713
commit 4f63426a59
2 changed files with 10 additions and 0 deletions
@@ -27,6 +27,11 @@ yarn --cwd packages/backend add \
 In your `packages/backend/src` folder, create an `instrumentation.js` file.

 ```typescript title="in packages/backend/src/instrumentation.js"
+// Prevent from running more than once (due to worker threads)
+if (!require('node:worker_threads').isMainThread) {
+  return;
+}
+
 const { NodeSDK } = require('@opentelemetry/sdk-node');
 const {
  getNodeAutoInstrumentations,