According to the APM SaaS Documentation, there is an ATC Notification Proxy Extension that runs inside the Infrastructure Agent.
However, I cannot locate the extension to download and add to our current APMIA.
Release : SAAS
The Extension is no longer available and has been removed for a while.
The documentation will be updated.
Created a Doc - Bug defect: DE558183
APM DX SaaS Doc Bug -REMOVE APMIA - ATC Notification Proxy Extension