add changelog note

Author: Lms24

CHANGELOG.md

@@ -4,6 +4,25 @@
 
 - "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
 
+- **feat(core): Apply scope attributes to metrics ([#18738](https://github.com/getsentry/sentry-javascript/pull/18738))**
+
+  You can now set attributes on the SDK's scopes which will be applied to all metrics as long as the respective scopes are active. For the time being, only `string`, `number` and `boolean` attribute values are supported.
+
+  ```ts
+  Sentry.getGlobalScope().setAttributes({ is_admin: true, auth_provider: 'google' });
+
+  Sentry.withScope(scope => {
+    scope.setAttribute('step', 'authentication');
+
+    // scope attributes `is_admin`, `auth_provider` and `step` are added
+    Sentry.metrics.count('clicks', 1, { attributes: { activeSince: 100 } });
+    Sentry.metrics.gauge('timeSinceRefresh', 4, { unit: 'hour' });
+  });
+
+  // scope attributes `is_admin` and `auth_provider` are added
+  Sentry.metrics.count('response_time', 283.33, { unit: 'millisecond' });
+  ```
+
 Work in this release was contributed by @xgedev, @Mohataseem89, @sebws, @G-Rath, and @gianpaj. Thank you for your contributions!
 
 - ref(nextjs): Drop `resolve` dependency from the Next.js SDK ([#18618](https://github.com/getsentry/sentry-javascript/pull/18618))