This is a very high level overview and ideally I would have liked to have seen more application level profiling, e.g. where time is being spent (be it on CPU or IO) within the DB rather than high level system stats. For example the following.

> CPU usage (from /proc/stat) averaged over 90%

Leaves me wondering exactly which metric from /proc/stat they are refering to. I mean it's presumably its user time, but I just dislike attempts to distill systems performance into a few graph comparisons. In reality the realized performance of a system is often better described given a narrative describing what bottlenecks the system.