opentelemetry-java-instrumentation/instrumentation/jmx-metrics/library/jetty.md

Jetty Metrics

Here is the list of metrics based on MBeans exposed by Jetty.

The metrics captured and their respective attributes depend on the Jetty version:

• Jetty 12 and later
• Jetty 9 to 11

Jetty 12 and later

Those metrics require the following Jetty modules to be enabled : jmx, http, statistics, sessions and at least one of ee8-deploy, ee9-deploy or ee10-deploy.

Metric Name	Type	Attributes	Description
jetty.thread.count	UpDownCounter		The current number of threads
jetty.thread.limit	UpDownCounter		The maximum number of threads in the pool
jetty.thread.busy.count	UpDownCounter		The current number of busy threads
jetty.thread.idle.count	UpDownCounter		The current number of idle threads
jetty.thread.queue.size	UpDownCounter		The current job queue size
jetty.io.select.count	Counter		The number of select calls
jetty.session.count	UpDownCounter	jetty.context	Current number of active sessions

• jetty.context corresponds to the deployed application subfolder in webapps folder.

Jetty 9 to 11

Those metrics require the following Jetty modules to be enabled : jmx, http and stats.

Metric Name	Type	Attributes	Description
jetty.thread.count	UpDownCounter		The current number of threads
jetty.thread.limit	UpDownCounter		The maximum number of threads in the pool
jetty.thread.busy.count	UpDownCounter		The current number of busy threads
jetty.thread.idle.count	UpDownCounter		The current number of idle threads
jetty.thread.queue.size	UpDownCounter		The current job queue size
jetty.io.select.count	Counter		The number of select calls
jetty.session.created.count	Counter	jetty.context	The total number of created sessions
jetty.session.duration.sum	Counter	jetty.context	The cumulated session duration

• jetty.context corresponds to the deployed application subfolder in webapps folder.