the overviews don't unfortunately have options to monitor hardware status like filesystems or memory, but you can configure testers for this (edit fw, General > Tester). Take a look at the File System Space and Free Swap Space testers. If a tester fails you can set it to generate an alert, and alerts can be escalated automatically from SMC via SMS, SMTP etc.
Do you think that adding overview file system components could be/possible to be added as a feature? The engine load is already there.
If so is there a way we can submit feature requests?
Currently there is no external system to submit feature requests, probably one will come out at some point but I'm not privy to any details...
Normally you'd open a ticket if you have an ask, but I'll pass on your request now. As usual a request is not a guarantee of implementation but it will be evaluated for future versions.