Identifying Late Arriving Hits

Also, one more question, are these typically Mobile App hits or can they include Web hits as well?

I suppose it depends on your definition of a "late arriving hit".

Technically, your mobile apps can be configured to capture "offline data", this will store a set number of tracking calls while the users are offline, then send that data to the server once the user reconnects to the internet... this means that the hit timestamp can be significantly earlier than when it arrives on the server.

On the other hand, you may just be referring to network latency and delays in processing data on the Adobe server (particularly when there is major incidents or maintenance occurring).

For the processing delays, the best option is to use the max delay on your Raw Data feeds to ensure as much data is processed as possibly before bundling up the feed and sending it off... I believe you can set up to 2 hours delay. Unless there are major issues, this should solve a lot of issues.

If you are talking about Mobile App Offline Data, that's a different story... data could come in months later... You could try creating a validation process where you maybe choose an acceptable time frame to re-pull data, then create a delta comparison between what you have and what is new, adding the new data to your lake...