From 6211772db060804f501c0372d97539f3e0629471 Mon Sep 17 00:00:00 2001
From: Trent Mick <trentm@gmail.com>
Date: Thu, 22 Feb 2024 15:38:25 -0800
Subject: [PATCH] add a diagnostic warning if attempting to use instr-fetch in
 Node.js

---
 .../packages/opentelemetry-instrumentation-fetch/src/fetch.ts    | 1 +
 1 file changed, 1 insertion(+)

diff --git a/experimental/packages/opentelemetry-instrumentation-fetch/src/fetch.ts b/experimental/packages/opentelemetry-instrumentation-fetch/src/fetch.ts
index f8fc3a2c6a..7ec2348c49 100644
--- a/experimental/packages/opentelemetry-instrumentation-fetch/src/fetch.ts
+++ b/experimental/packages/opentelemetry-instrumentation-fetch/src/fetch.ts
@@ -470,6 +470,7 @@ export class FetchInstrumentation extends InstrumentationBase<
     if (isNode) {
       // Node.js v18+ *does* have a global `fetch()`, but this package does not
       // support instrumenting it.
+      this._diag.warn('this instrumentation is intended for web usage only, it does not instrument Node.js\'s fetch()')
       return;
     }
     if (isWrapped(fetch)) {