Ganglia on wmflabs is missing disk I/O reporting. The reason we want them, is to be able to tell which instance is doing heavy I/O activities which might be kill GlusterFS (see bug 36993).
There is a Gmetric plugin which we might want to use. Based on /proc/diskstats
We used to have a homegrown ganglia-metrics debian package in /trunk/ganglia_metrics, it is probably obsolete nowadays. Anyway, there was a python script there:
OR, maybe Ganglia already provides the metrics and it is all about enabling them?