I have been reached out by a recruiter for a Production engineer position at Meta and they have scheduled an initial discussion call.

If anyone could advise what topics should I prepare for the technical interviews. What kind of questions are asked and what is the usual difficulty level?

Any help/advice is much appreciated. :)

Edit (Post interview- phone screen): If it helps anyone!
Troubleshooting: Suppose you are working as a deployment engg. and your team works on a service which is called XYZ, which takes pictures of cars and bikes. There is already one service which is deployed onto the server, but one of the developers is trying to upload a new version of this particular service. They've tried multiple times deploying it but when they try to hit the service, they are not getting the newer response. So, how are you going to troubleshoot this?

Coding: Was asked Dinosaur question and one question where I was given a function which returns arbitrary number of stories along with its popularity score (e.g. (st1, 60)). Function could return same story multiple times with new scores. Using that func, I had to return top 5 stories which had met certain popularity cutoff.