Has anyone extended the queries to include quota information? If so, can you provide me with some examples of the queries you are using?
I haven't done it myself directly, but I worked with someone that used the rest api to pull down various performance data (including quota) and writing it to a file which a monitor input was setup on. Maybe something along these lines? (doesn't have to be powershell) https://community.emc.com/community/products/isilon/blog/2013/09/25/using-powershell-with-the-papi-a...
I am guessing this outside of what the app is doing, but the best bet would be to identify what it is doing and hitting the docs (unless somebody can provide a better answer than this hah)