Add changelog entry for OTLP integration

Author: andreiborza

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 - "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
 
+### Important Changes
+
 - **feat(node): Expose `headersToSpanAttributes` option on `nativeNodeFetchIntegration()` ([#19770](https://github.com/getsentry/sentry-javascript/pull/19770))**
 
   Response headers like `http.response.header.content-length` were previously captured automatically on outgoing
@@ -38,6 +40,33 @@
   changes. We cannot yet guarantee full support for server-islands, due to a [bug in Astro v6](https://github.com/withastro/astro/issues/15753)
   but we'll follow up on this once the bug is fixed.
 
+- **feat(node-core): Add OTLP integration for node-core/light ([#19729](https://github.com/getsentry/sentry-javascript/pull/19729))**
+
+  Added `otlpIntegration` at `@sentry/node-core/light/otlp` for users who manage
+  their own OpenTelemetry setup and want to send trace data to Sentry without
+  adopting the full `@sentry/node` SDK.
+
+  ```js
+  import { NodeTracerProvider } from '@opentelemetry/sdk-trace-node';
+  import * as Sentry from '@sentry/node-core/light';
+  import { otlpIntegration } from '@sentry/node-core/light/otlp';
+
+  const provider = new NodeTracerProvider();
+  provider.register();
+
+  Sentry.init({
+    dsn: '__DSN__',
+    integrations: [
+      otlpIntegration({
+        // Export OTel spans to Sentry via OTLP (default: true)
+        setupOtlpTracesExporter: true,
+      }),
+    ],
+  });
+  ```
+
+  The integration links Sentry errors to OTel traces and exports spans to Sentry via OTLP.
+
 ## 10.43.0
 
 ### Important Changes