ZFS Monitoring zpool capacity with Nagios

I've been using MRTG/Routers2 to graph disk usage, including specific filesystems on my ZFS storage boxes. Plain SNMP queries to the hrStorage MIBs. This has been working well for a long time. But, when I went looking to see how I was doing it in response to this thread, I discovered it's no longer graphing anything. :( Just shows 0% disk usage for my ZFS filesystems.

On the bright side, now I know about it, so I can go dig into it. :)
 
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Irrelevant to Nagios but Munin has many plugins for ZFS. On of them is for reporting the capacity of a pool:

zfs_usage_storage-day.png
 
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