1 Apache Tomcat Metrics

Oracle Enterprise Manager can be used to manage Apache Tomcat. You can use the All Metrics page for an Apache Tomcat target to view the metrics that are being monitored for that target by Oracle Management Agent.

Application Cache Metrics

This metric category contains the usage details of the application cache of the Apache Tomcat container.

Default Collection Interval — Every 5 Minutes

Table 1-1 Application Cache Metrics

Metric	Description
Cache Access Count	Number of times the cache was accessed since last collection
Cache Hit Count	Number of times the cache was hit since last collection

All Applications Metrics

This metric category contains aggregated performance metrics spanning all the applications deloyed to the Apache Tomcat container.

Default Collection Interval — Every 5 Minutes

Table 1-2 All Applications Metrics

Metric	Description
All Applications - Rejected Sessions	Number of sessions rejected by all the applications running on the Apache Tomcat container since last collection
All Applications - Sessions Created	Number of sessions created by all the applications running on the Apache Tomcat container since last collection
All Applications - Total Active Sessions	Active sessions of all the applications running on the Apache Tomcat container

All Applications JSP Monitor Metrics

This metric category contains aggregated performance metrics spanning all the JSPs deployed to the Apache Tomcat container.

Default Collection Interval — Every 5 Minutes

Table 1-3 All Applications JSP Monitor Metrics

Metric	Description
All Applications - JSP Access	Number of times JSPs were accessed on all the applications since last collection
All Applications - JSP Reload	Number of times JSPs were reloaded on all the applications since last collection

All Global Request Processors Metrics

This metric category contains aggregated performance metrics spanning all the Global Request Processors deployed to the Apache Tomcat container.

Default Collection Interval — Every 5 Minutes

Table 1-4 All Global Request Processors Metrics

Metric	Description
All Global Request Processors - Total Bytes Received	Bytes received by all the request processors running on the Apache Tomcat container since last collection
All Global Request Processors - Total Errors	Error count on all the request processors running on the Apache Tomcat container since last collection
All Global Request Processors - Total Requests	Request count on all the request processors running on the Apache Tomcat container since last collection
All Global Request Processors -Total Bytes Sent	Bytes sent by all the request processors running on the Apache Tomcat container since last collection

Applications Metrics

This metric category contains the metrics for each application deployed to the container.

Default Collection Interval — Every 5 minutes

Table 1-5 Applications Metrics

Metric	Description
Total Active Sessions	Total number of active sessions since startup
Total Rejected Sessions	Total number of rejected sessions since startup
Total Sessions Since Startup	Total number of sessions created since startup
Total Processing Time (ms)	Total processing time (in milliseconds) since startup
Total Request Count	Total number of requests served since startup
Processing Time Since Last collection (ms)	Processing time (in milliseconds) since last collection
Active Session Since last collection	Number of active sessions created since last collection
Sessions Created Since Last collection	Number of new sessions created since last collection
Rejected Sessions Since Last collection	Number of sessions rejected since last collection
Request Count Since Last collection	Number of requests served since last collection
Average Processing Time (ms)	Average time taken (in milliseconds) for processing a request

DataSource Metrics

This metric category contains the attributes of all the data sources configured for the Apache Tomcat container.

Default Collection Interval — Every 5 Minutes

Table 1-6 DataSource Metrics

Metric	Description
Active Datasource Connections	Number of active connections to the data source
Idle Datasource Connections	Number of idle connections to the data source

Global Request Processor Metrics

This metric category contains the attributes of each Global Request Processor configured on the Apache Tomcat container.

Default Collection Interval — Every 5 Minutes

Table 1-7 Global Request Processor Metrics

Metric	Description
Average Request Processing Time (ms)	Average time taken (in milliseconds) for processing a request by the global request processor
Bytes Received Since Last Collection	Bytes received by each request processor since last collection
Bytes Sent Since Last Collection	Bytes sent by each request processor since last collection
Errors Since Last Collection	Error count of each request processor since last collection
Request Processing Time (ms)	Request processing time (in milliseconds) of each global request processor
Requests Since Last Collection	Number of requests served by each request processor since last collection

JSP Monitor Metrics

This metric category contains the usage details of JSPs.

Default Collection Interval — Every 5 Minutes

Table 1-8 JSP Monitor Metrics

Metric	Description
JSP Access	Number of times JSPs were accessed since during last collection
JSP Reload	Number of times JSPs were reloaded since last collection

Memory Usage Metrics

This metric category gives information about the memory load on the Apache Tomcat container.

Default Collection Interval — Every 5 minutes

Table 1-9 Memory Usage Metrics

Metric	Description
Heap Memory Usage (MB)	Heap memory usage (in MB) of the server
Non Heap Memory Usage (MB)	Non-heap memory usage (in MB) of the server

Response Metrics

This metric category shows the status of the Apache Tomcat container.

Default Collection Interval — Every 5 Minutes

Table 1-10 Response Metrics

Metric	Description
Status	Status of the Apache Tomcat container - whether up or down

Servlets Metrics

This metric category contains attributes of each servlet loaded on the Apache Tomcat container.

Default Collection Interval — Every 5 minutes

Table 1-11 Servlets Metrics

Metric	Description
Maximum Servlet Request Processing Time (ms)	Maximum time taken (in milliseconds) for processing a request by the servlet
Total Servlet Request Processing Time (ms)	Total time taken (in milliseconds) for processing all the requests by the servlet
Number Of Requests Since Startup	Number of requests received by the servlet since startup
Number Of Errors Since Startup	Number of erroneous requests received by the servlet since startup
Processing Time Since Last Collection	Time taken for processing all the requests since last collection
Requests Count Since Last Collection	Number of requests served by the servlet since last collection
Average Processing Time (ms)	Average processing time (in milliseconds) since last collection
Number Of Servlet Errors Since Last Collection	Number of erroneous requests received by the servlet since last collection

Session Manager Metrics

This metric category contains the statistics of the sessions managed by the Apache Tomcat container.

Default Collection Interval — Real-Time Only

Table 1-12 Session Manager Metrics

Metric	Description
Active Sessions Since Startup	Active number of sessions of each application since startup
Rejected Sessions Since Startup	Number of sessions rejected by each application since startup
Application Name	Name of the deployed application
Sessions Created Since Startup	Number of new sessions created since startup
Sessions Created Since Last Collection	Number of sessions created since last collection
Active Sessions Since Last Collection	Number of active sessions since last collection
Rejected Sessions Since Last Collection	Number of sessions rejected since last collection

Thread Pools Metrics

This metric category contains statistics on various thread pools used by the Apache Tomcat container.

Default Collection Interval — Every 5 Minutes

Table 1-13 Thread Pools Metrics

Metric	Description
Busy Threads	Number of busy threads on the Apache Tomcat container
Threads	Number of threads created on the Apache Tomcat container