Improvements
Updated LCP tracking
Largest Contentful Paint will now stop being tracked when page visibility changes to hidden. This aligns with the web-vitals library.
Added passive flag to addEventListener calls
Using the addEventEventListener without the passive flag for the touchstart event is flagged in Lighthouse. The passive flag is now applied to all addEventListener calls in the agent.
Update to Cumulative Layout Shift calculation
The CLS calculation has been updated to use session windows in order to align with Google Chrome tooling (Lighthouse, PageSpeed Insights, CrUX). For more information, see the official blog post on web.dev.
Bug Fixes
Fixed issue with Array.isArray() call
Array.isArray() call is not supported on old browsers and can cause a runtime error. This call has been replaced with an alternative that works on older browsers.
Fixed issue with null function argument in the addEventListener API
When a null value was passed in to the addEventListener API, the agent would report an internal error. This edge case is now being handled.
Fixed issue with Ajax deny list
There was an edge case where certain ajax calls could have been excluded when they should not have been. This is now handled correctly.
Miscellaneous
Added support for collecting internal/supportability metrics
The agent can now send metrics that capture information about how the agent itself is working internally.