Hi Ricardo,
That graph is a picture of a single Websphere agent from the host dap7261lx0003 as specified on the left hand side (tree) of the image. The data points represent the CPU Processors (0 through 15) as you have highlighted the CPU folder. If you hover over the data points, it will show you which processor number it relates to.
That metric specifies that the single agent comes from a host that has 16 cores.
Regards,
Matt