How to get player statistics from server?

Hi,
I am using Rcon to get simple data (for example players score) of my server every 5 min and save it for statistical analysis, I hope I can get something interesting out of it. But these data are very little, so I will be happy if someone knows:

1. How to fetch simple data from a server I don't own?
2. How to fetch more data (for example total XP, accolades, challenges done) of players how play on my server?

Thanks

You can get all the info about the players from the memory while host, this includes which custom classes and killstreaks they use. You can only get the number of players from other servers unless you join it.

All in all, if you're not host you wont get much useful info.