OK. For starters, I don't actually know either solutions (the ZL Archive mentioned before or the Global Relay) - just googled what they do.
But.
The main question is not what "needs to be collected", because that is something that should stem from the business needs. The question might be what can be collected. Either you build your business case from the business need and verify if it can be achieved with the service provider (in other words, your business says - we want to be able to track this and that and you verify if either of those providers give you means of retrieving such data) or you go the other way around - check what data you are able to ingest from there and verify if there is any business case for that.
A quick browse through their website doesn't yield very optimistic results. The only docs about any kind of API I could find was about sending data into their platform. I'm not sure if there is any way of either getting the data out of it or getting any form of automated query, retrieving audit records and so on. At least there's no easily available info on that. That might be a thing you need to contact their support about.
