i have 2 servers
1 is Windows
2 is Unix
The data(Cpu, Memory, Disk usage )on these two servers comes into splunk
my Question is : I need an alert if their usage exceeds 90%.
What have you tried so far? Do you have a search that returns the resource usage for the servers? That's the first step. Once you have a working search, add a clause that discards anything < 90%. Then save the search as an alert.