Hi Narongkij,
You can do the usual monitoring of a server which is, look at the cpu, memory, disk io, network etc. Using a system edge agent and discovering the device in CAPC would get you these.
In addition, there is a "System health" monitoring in CAPC. This is one of the menu options as soon as you login to CAPC.
DA is automatically discovered and statistics pulled for key metrics.
In addition, you can use Application Performance Management (APM) which is another product within CA which is used to look how a process is behaving. At this stage, there is no direct integration, however there are scripts that are available with which you can monitor the karaf.
Regards
Seenu Mathew