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There are roughly 4 categories of Metrics enabled in OpenMeetings

Tomcat statistics

All Servlet calls, including the WebService calls are available automatically in Prometheus. They are collected by a ServletFilter and published as metrics. 

SeeBasic Tomcat generics see: /openmeetings-web/src/main/java/org/apache/openmeetings/web/util/logging/TomcatGenericExports.java 

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Example active_threads

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Servlet HTTP requests via ServletFilter

All Servlet calls, including the WebService calls are available automatically in Prometheus. They are collected by a ServletFilter and published as metrics. 

Once collected in Prometheus you can filter all statistics and run queries on long running or size.

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