May 15, 2026
We've made it easier to auto-instrument New Relic Browser Agent monitoring on Drupal 10.2+ sites.
Starting in Drupal 10.2, strict Content-Length headers were introduced that broke New Relic's standard Browser Agent auto-injection. You can now re-enable browser monitoring with a single pantheon.yml setting, and Pantheon's platform will handle the injection automatically. Changes take effect within a few minutes.
WordPress sites and Drupal versions prior to 10.2 are unaffected. Browser Agent auto-instrumentation continues to work out of the box for those frameworks.
For full details, visit our documentation page on New Relic.