See also: Apache integration information.
The number of asynchronous closing connections.
The number of asynchronous keep-alive connections.
The number of asynchronous write connections.
The total number of connections handled.
The total number of bytes served.
The number of bytes served per second.
The total number of requests performed.
The number of requests performed per second.
The number of workers currently serving requests.
The percentage of CPU used.
The number of idle workers in the instance.
The amount of time the server has been running in seconds.