This might now be a feature request. Following your advice, I can get a nice trend graph of HD usage, but NOT Free Space. You may say it's similar, but I have two servers with over 3TB of used space, and less than 100GB of free space. Looking at graphs of 3+TB usage they barely move, but if I could see the graphs of <100GB free space, I would actually see it reducing (and even better if it would give me a 'predicted days till full' estimate!).
There seem to be reports which do this at the datastore level, but I would like to see at the Guest level.
Computer Manager at Bedford School, UK (since 1999).
Veeam user since 2009.