This is a work-in-progress monitor script I'm using on my Synology DiskStation DS212j NAS. It gathers data from different sources and stores/presents them using Tobias Oetiker's RRDtool.
Things you need in order to run the monitor:
Bootstrap: you'll need a number of third-party packages available on a bootstrapped DiskStation. Check this bootstrapping-guide to learn how to do it.
Python: it can be installed from Package Center
RRDtool:
> ipkg install rrdtool
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> curl -k https://raw.github.com/pypa/pip/master/contrib/get-pip.py | python > pip install PyRRD