Performance counters measure system activity and performance
(metrics). The application retrieves their current values in predefined
intervals. The aim of probing and collecting data is to analyze and
data into a performance graph/chart. You can define a counter
manually or load it from a template. Counter templates provide defined
for specified devices in order to improve and quicken counter
Each counter template is characterized by the following
Name and description - unique identifier and optional
Device type - type of a device,
Protocol type - protocol used,
Probing interval - pauses between probing.
In order to add Apache Tomcat performance counters, perform
the following steps:
Select device from aspect tree in Home view.
Select Monitors tab and switch to the counter list by
clicking Counter list link in the upper-right corner of the tab field.
A counter list is displayed.
Select Create counter from the global action menu and
Select the counter you want to create and click Next.
Once the data has been loaded, the edit window shows up
with all counter attributes to be provided.
Specify the rest of counter parameters (alarms, thresholds
etc.) and click Finish.
The new counter has been created and is now visible on the
Creating Custom Event Processing Rules For Apache Tomcat
In this tutorial I'll show how to assign basic event
such as: alarm generating, event dropping/forwarding and severity
To assign an event processing rule, perform the
After selecting the desired host go to Events
Select events, choose Assign processing
rules and click Go.
A dialog window is displayed (see figure
Select rule category and click Add new
The newly created event
processing rule is now visible and active (there's no need to logout).
Tomcat Plugin Overview
Tomcat plugin provides four following views:
view - overall information about Tomcat version, OS Name and version,
JVM vendor and
version, JVM info,Control port, Average Response Time. It also contains
dashboard view with charts for response summary and threads
Applications view -
status: current sessions, peak sessions as well as servlets and page
performance: URL and average response time.)
processors view - information
concerning request processors and global request processor
(URI, Worker, request and error counts, sent and received bytes,
processing time) and chart for
response summary for connector.)
Connectors and thread
pools view - information concerning connectors parameters
(port, protocol, secure, redirect port, max post size),
thread pool (name, current threads busy, current threads count, max
spare threads) and chart for threads availability.)
If you performed all
actions described in this guide you are now able to monitor Apache