Check manual page of j4p_performance.threads

j4p_performance.threads

Author: Lars Michelsen

License: GPL

Distribution: official part of Check_MK

Supported Agents: Linux

This checks uses the JSON HTTP service of j4p (from jmx4perl) to monitor the number of threads created by a Java application server like Tomcat or JBoss. You can define levels against the number of threads of the Java machine.

Take a look at the j4p_performance.mem manpage for instructions on how to set up the needed agent plugin.

Item

The instance name as configured in j4p.conf with the variable instance.

Check parameters

Parameter	Type	Description
warning	int	The warning level for number of threads
critical	int	The critical level for number of threads

Performance data

Several variables: ThreadRate: Number of threads created per interval. ThreadCount: Number of threads. DeamonThreadCount: Number of daemon threads. PeakThreadCount: Maximum number of threads since program start. TotalStartedThreadCount: total number of started threads since program start.

Inventory

One check is created for each JMX instance sent by the agent.

Configuration variables

Variable	Type	Description
j4p_performance_threads_default_levels	int, int	Default levels for number of threads. This is preset to (80, 100).

Examples

# Set default levels for number of threads to (WARN 50, CRIT 80)
j4p_performance_threads_default_levels = (50, 80)