[LOPS-1952] new relic agent update release note (#8958)

* new relic agent update release note

* update new relic agent update changelog

* update date for new relic php agent release note

* Update source/releasenotes/2024-05-07-new-relic-agent-update-released.md

* update date

---------

Co-authored-by: Phil Tyler <phil.tyler@pantheon.io>
Co-authored-by: Chris Reynolds <chris.reynolds@pantheon.io>

source/releasenotes/2024-05-07-new-relic-agent-update-released.md

@@ -0,0 +1,26 @@
+---
+title: New Relic PHP agent v10.19.0.9 now available with PHP 8.3 compatibility and other fixes
+published_date: "2024-05-06"
+categories: [tools-apis, action-required]
+---
+
+The New Relic PHP agent has been updated to the latest version (v10.19.0.9). Compared with the previously available version on the platform (v10.10.0.1), some of the changes and fixes include:
+
+* Drupal 9.4+ now reports hooks and modules (see below for more details)
+* Resolved erroneous deprecation warnings for PHP 8.1+
+* Support for PHP 8.3
+
+See the [complete New Relic PHP agent changelog](https://docs.newrelic.com/docs/release-notes/agent-release-notes/php-release-notes/) for more details.
+
+[Learn More about New Relic](/guides/new-relic), real-time performance monitoring for your Pantheon web applications. 
+
+## Action Required: Default behavior of New Relic Drupal metrics has changed
+
+Pantheon no longer supports Drupal-specific metrics in New Relic by default. However, the functionality is still available. If this is crucial for troubleshooting your sites, please add these lines to your site’s `pantheon.yml` file to enable this reporting:
+
+```
+new_relic:
+  drupal_hooks: true
+```
+
+Our support team is happy to help if you have any questions or need assistance.