Unexpected Load Alerts

Often, administrators want to be alerted during periods of unexpected high load as it is often a precursor to other problems (e.g. memory issues or thread contention issues). Admin4J sends out alerts at configurable threshold levels. These alerts will contain a thread dump. this thread dump will provide insight into contention issues and also allow you to identify performance hot spots. You'll also get a notice when load returns to normal.

Add the following filter and filter mapping to your applications web.xml:

<filter>
	<filter-name>Concurrent Usage Filter</filter-name>
	<filter-class>
		net.admin4j.ui.filters.ConcurrentUsageFilter
	</filter-class>
	<init-param>
		<description>Specifies alert thresholds.</description>
		<param-name>alert.levels</param-name>
		<param-value>100,200,300</param-value>
	</init-param>
</filter>

<filter-mapping>
	<filter-name>Concurrent Usage Filter</filter-name>
	<url-pattern>/*</url-pattern>
</filter-mapping>
				

The following configuration parameters are supported for the performance tracking filter.