By default, EventSentry ships with several performance counters which are configured to work with Non-Windows Operating Systems such as Linux out of the box.
The performance counters which should work are:
- System Memory
- Network Bandwidth
- Page File Usage
- System Memory Percent Free
Have you tried assigning the "Performance System" package to your Linux boxes, that should be sufficient.
Are there any additional metrics you would like to collect, we'd be happy to take a look at that and supplement the default configuration.