Average statistics across servers
What is it?
An aggregate server combines the stats from the selected members and calculates the mean average. It also lets you see the metrics for all members graphed together.
Alerts across multiple servers
If you have many servers doing the same job (e.g. a web cluster) it's more useful to see the average stats across all servers and have alerts triggered on them as one.
And its free!
It doesn’t count against your total for billing!