Usage statistics for CPU, disk (read/write) and network activity will be unavailable for several weeks for stability reasons.
Originally, our statistics tool was intended for IaaS servers. It was then adapted for use on instances, but the visualizations have not been entirely accurate. In fact, they weren't accurate at all. For this reason, usage statistics will no longer be available.
Over the last few months, our technical team has been working on a new system, which will replace the ones that have been present on PaaS/Simple Hosting and IaaS/VPS. These stats will be more detailed and precise in representing the real resource consumption on the instance. The new tool will also be considerably prettier, and we'll be able to build additional features on top of it.
The new statistics system will be released for PaaS instances in a few weeks. The IaaS version for VPS will follow shortly thereafter.