I need to update my AA extension to v1.9.0 before publishing, but I can't find the release notes of this version. Am I missing something?
With my past experience - though extension upgrades come through but sometimes it takes time to update in documentation release notes parts however you can check AppMeasurement release notes.
As I can see the AA extension ver 1.9.0 comes with AppMeasurment version 2.22.4 Release Date: January 18, 2022 which tells what changes comes through.
Hope this helps.
The page has been updated with Adobe Analytics Extension 1.9.0 please check on below link