Could you please suggest build in services to get the status of used memory, total sessions and System treads of integration server .
Check WmRoot package.
For Unix - OS level metrics, you can use sar command.
Please login to Integration server and then navigate to Server->Statistics
Here you will find the details about total Sessions, System threads and used memory by the Integration server
And In order to get the details of Service Usage, navigate to Server->Service Usage.