Monitoring Jetty
The Jetty sensor is automatically deployed and installed after you install the Instana agent.
Support information
To make sure that the Jetty sensor is compatible with your current setup, check the following support information sections:
Supported versions and support policy
The following table shows the latest supported version and support policy:
| Technology | Support policy | Latest technology version | Latest supported version |
|---|---|---|---|
| Jetty | 45 days | 12.1.7 | 12.1.6 |
For more information about the support policy, see Support strategy for sensors.
Supported tracing
For this technology, Instana supports tracing. For more information, see Instrumented frameworks and libraries.
Enable JMX
If JMX is not enabled, the following message is displayed in the UI:
Jmx module is not enabled in jetty.
Please enable it to be able to collect data. You can do so by adding --module=jmx to start.ini.
For Jetty version 8 and lower, uncomment etc/jetty-jmx.xml in the start.ini file. Make sure that the jetty-jmx.xml is the first XML file listed in the list.
Configuring Jetty monitoring
The agent natively monitors Jetty, and configuration is optional.
Configuring the custom polling rate
To configure a custom polling rate, add poll_rate in the <agent_install_dir>/etc/instana/configuration.yaml file, as shown in the following configuration:
com.instana.plugin.jetty:
poll_rate: 1 # Value is in seconds. Default value is 1 second.Metrics collection
To view the metrics, select Infrastructure in the sidebar of the Instana User interface, click a specific monitored host, and then you can see a host dashboard with all the collected metrics and monitored processes.
Configuration data
- Version
- Start time
- Queued Thread Pool (min/max threads)
- Connectors
- Web Apps
- Name
- Context Path
- State
- War File Path
- Temporary Directory
- Classpath
Performance metrics
To view the metrics, select Infrastructure in the sidebar of the Instana User interface, click a specific monitored host, and then you can see a host dashboard with all the collected metrics and monitored processes.
Queued Thread Pool Stats
| Metric | Description | Granularity |
|---|---|---|
| Idle Threads | The total number of idle threads in the jetty pool. | 1 second |
| Busy Threads | The total number of busy threads in the jetty pool. | 1 second |
| Total Threads | The total number of threads (both idle and busy) in the jetty pool. | 1 second |
| Threads Queue Size | Queue size of the thread pool. | 1 second |
Web Apps
| Metric | Description | Granularity |
|---|---|---|
| Active Sessions | The number of active sessions for the web application. | 1 second |