Jetty currently has two levels of request statistic collection:
- Subclasses of AbstractConnector class optionally can collect statistics about connections as well as number of requests.
- The StatisticsHandler class may be used to collect request statistics.
In addition to that, subclasses of AbstractSessionHandler class optionally can collect session statistics.
AbstractConnector and AbstractSessionHandler statistics are turned off by default and must either be configured manually for each instance or turned on via JMX interface. The Statistics Handler is not included in default Jetty configuration, and needs to be configured manually.
To view statistics, you have to be able to connect to Jetty using either JConsole or some other JMX agent.
Detailed statistics on connection duration and number of requests are only collated when a connection is closed. The current and maximum number of connections are the only "live" statistics. To learn how to turn on connector statistics please see Jetty Statistics tutorial, although this is not recommended and it is best to use a JMX agent to select statistics only when needed.
To collect request statistics a StatisticsHandler must be configured as one of the handlers of the server. Typically this can be done as the top level handler, but you may choose to configure a statistics handler for just one context by creating a context configuration file. To learn how to configure a top level statistics handler, please see Jetty Statistics tutorial.
Session handling is built into Jetty for any servlet or webapp context. Detailed statistics on session duration are only collated when a session is closed. The current, minimum, and maximum number of sessions are the only "live" statistics. The session statistics are always on and do not need to be configured.
See Jetty JMX tutorial for instructions on how to configure Jetty JMX integration.