This is a great application for trending your servers (Solaris, Linux and also windows machines with some tweaking)
Trends all the usual things cpu, memory, http requests, uptime etc.
Worth taking a look at it if you need some sort of data to prove you need to either purchase additional equipment or just need to move certain services off machines due to CPU being maxed.
You can also create your own monitoring plugins as well you can set the system up to monitor garbage collection states for any java process’s you have running. Or set the system up to pull data in from any log files your application creates.