You have to remember the goal of virtualization is consolidation of hardware resources in order to maximize what would normally be minimized. Providing more information such as number of guests on this host and the number of guests that have more then one vCPU would help as well.
Looking at the host itself here will only give you an idea of the host, not the guests. Also take note that the largest peaks are MHz used. Get rid of the MHz data points and look just at the Cores themselves. You'll take note that your average CPU otherwise is < 50%
You need to couple this graph with the same graph of the guest CPU usage to determine if only a few select guests are using a lot of CPU or if its just wide spread sporadic.
Then I would look at CPU Ready Times to determine if this is even anything to be concerned about. High utilization and low ready times == excellent consolidation with maximum resource usage and minimum guest server impact. But if this high utilization is also coupled with high ready times...you've got an issue to worry about.
