[Observium] NetApp filer graphs for Disk IO and Network IO are all NaN

We're running Observium Pro 0.15.4.6386, and I have added our NetApp 2230 filers. The filers are running v8.2.2 Cluster. I'm getting some data, but the graphs in Observium for Network I/O and Disk I/O are all NaN.

Any ideas?

I'm willing to poke into the issue (bad interpretation of returned values? Need updated OID?), but not sure where to start.

Thanks.

-Pete