vCenter appliance CPU Usage

hi guys

I have an instance of vCenter appliance build 799731.

I see how the CPU Usage have been increasing in the last month and I get alerts about that (we have configure an open source alert system)

check this out

Initially cpu percentage 27% - 12/29/2012 and as of today 75%.

Memory 8Gb, 2 vCPUs

any idea what could be causing this?

We have right now only machines for testing around 25 VMs nothing is in producción and we have HA-DRS-sDRS configured

thanks a lot