Dear Aswath,
Thank you for your detailed update. Regarding your question about Azure Monitor Agent (AMA) and Data Collection Rules (DCR) connectivity.
In short term to answer to yours question (Do i need to allow communication for AMA from Microsoft AMA pre-requisite on top of the pre-requisite for ARC? )
My answer is: Yes, you must allow additional outbound connectivity for Azure Monitor Agent (AMA) beyond what Azure Arc requires.
Let me to know if you need an additional explanations like why & etc. (just high light me here).
Best regards,
Alex
P.S. If my answer help to you, please Accept my answer p.p.s Sorry I forgot to add some sutiable links for MSFT docs according yours Question
just here: