Thank you for the post @MohammedAsikM
Based on my research, the content update 8447-6897 was released on 17th August 2021. In the Customer Support Portal as well as directly on the Firewall only latest content updates can be searched and referenced for release notes.
Myself if I need to reference old content update, I search it in the archive email that I subscribed to from: "Palo Alto Networks Content Update <firstname.lastname@example.org>" then I can reference this information several month back.
Coming back to your question, here is the link for new apps introduced in that content update: https://live.paloaltonetworks.com/t5/customer-resources/new-app-ids-for-august-2021/ta-p/426811
Here are screens from the email notification:
I hope this is information you were looking for.
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