We would like a nice graph, showing by ZFS zpool vdevs the disk activity in terms of latency, throughput, %b, %w, etc. Basically, the output from iostat -xn 1 but arranged in groupings of vdevs.
It is likely someone has already done this, so I encourage you to spend some time looking on the net before writing it yourself.
The standard Munin Sola...
Skills: linux, solaris, unix, munin, cacti