Foglight for Java EE Technologies 5.9.7.5 - Application Servers User Guide

Investigating system component health

The health of a system depends on the health of its servers, applications, and components (where applicable). Using the System view of the Application Servers Monitor dashboard, you can drill down to investigate the health of an individual system component.

Figure 15. For example, from the Servers table in the Systems view, you can see that a JBoss Java Virtual Machine (JVM) is experiencing a problem.

To investigate:

Click the health status icon in the JVM column. A popup opens.

Review the information in this popup. For example, check that the garbage collection rate and overhead shown in the GC Rate & Overhead chart are as expected.

Click the JVM name at the top of the popup. The Java Virtual Machine (JVM) view opens.

Figure 16. In the JVM view, you can see that the warning health status is due to a warning level alarm.

Click the health status icon for the JVM to review the alarm details.

For more information about the rules that generate alarms for the JVM, review the rules on the Foglight Rule Management dashboard (Dashboards > Administration > Rules & Notifications > Rule Management > search for “JVM”).

The JVM is just one example of a component for which there are drill-down views. Other examples include Web Applications, Web Services, EJBs, Requests, Services, Application Pools, and Sites. In all cases, you can access these drilldown views by clicking the name of an object or component in a health status popup, as described in the previous example.

For more information about individual views, see Application Servers Monitor Views .

Monitoring Servers

The Servers tile of the Application Servers Monitor dashboard allows you to monitor specific application servers. From this view, you can investigate individual application servers in your internal and remote infrastructure and review the invoked operations used by these application servers.

To learn more about the supported application servers, see one of the following guides:

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Foglight for Java EE Technologies Supported Platforms and Servers Guide

•

Foglight for JMX Systems User Guide

•

Foglight for Microsoft .NET Installation and Configuration Guide

From this view, you can perform the following actions:

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Review the number of servers in your infrastructure

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Review the health of the servers

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Identify the application server type

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Review the server Availability (average for the timeline range specified)

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Review the server Outages

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Review JVM Heap Usage (average for the timeline range specified)

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Review JTA Rollback totals (Sum for the timeline range specified)


	IMPORTANT: JTA Rollback totals are available only for Foglight for Java EE Technologies.

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Review source metric charts in Quick View

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Collect Traces (from the Action panel > General tab)

To view the servers:

On the navigation panel, under Dashboards, click Application Servers > Monitor. The Application Servers Monitor dashboard opens.

Click the Servers tile.

Figure 17. The Application Servers Monitor dashboard.

Servers list

The Servers table lists all the application servers running in your environment. Use this table to review the health and version of any monitored application server, as well as the availability (up time as a percentage), and any outages. Select an application server in this table to display detailed information in the Server Details view on the right.


	NOTE: In addition to the default columns, there are a number of columns you can add to this table. For information about how to select columns, see Show/Hide table columns .

Server details

This view provides details about the server that you select in the Server table, including: Request Types, Method Groups, health of the JVM, Applications, any collected MBean components, EJBs, and Services.


	NOTE: The details available in this view are relative to the type of server selected in the Servers table.

Each monitored component in the server details view has a health status icon, and each component name is a link. To view the health summary for the component, click the status icon. For more information, see Reviewing the health of your systems.

To view more details about a component, click the name link. A popup or drilldown view opens, providing more information. For example, click JVM to open the Java Virtual Machine (JVM) view.


	TIP: Use the breadcrumb trail at the top of any drilldown view to return to the Application Servers Monitor dashboard.

Quick View

The Quick View option provides condensed charts that show the general state of a selected system. These charts answer questions such as: What are the slowest three requests on server ABC, or what thread pools have the most waiters? Depending on the type of application server selected, the Quick View Selection menu will differ. The following table outlines the charts available for each application server type.

Table 1. .NET application servers
Quick-View Chart Name	Description
Sites - Current Connections	Period average of current connections to the web site.
Web Applications - Request Rate	The number of requests executed per second by the application.
Site - Request Throughput	The rate, in seconds, at which all HTTP requests have been received.
Web Application - Timed Out Requests	Count of web application requests that timed out.
Application Pool - Exception Count	Count of exceptions that occurred in the application pool.
Application Pool - % Processor Time	Percentage of processor time used by the application pool, as a period average.
Executable/Service - Exception Count	Count of exceptions that occurred in all standalone executables and Windows services applications monitored by the server.
Executable/Service - % Processor Time	Current processor time used by all monitored executable and Windows services applications.

Table 2. JBoss application servers
Quick-View Chart Name	Description
Slowest Response Times	Request with longest response times on average.
Longest Wait Times	Queues with the longest wait times on average.
Most Active Topics	Topics with largest incoming message rate on average.
Highest Pool Usage %	EJB pools with highest usage percentage on average.
Slowest Service Times	JSPs/Servlets with the lowest service times on average.

Table 3. OracleAS application servers
Quick-View Chart	Description
Slowest Response Times	Requests with longest response times on average.
Longest Queues	Thread pools with largest number of requests in their thread pools on average.
Longest Total Wait Times	JSBC connection pols with the longest total time all requests spent waiting for a connection.
Slowest Service Times	JSPs/Servlets with the longest request times on average.

Table 4. Tomcat application servers
Quick-View Chart	Description
Requests - Slowest Response Times (ms)	Slowest response time for each request traced.
JVM - Heap Usage	Capacity and Used memory.
JSP/Servlets - Error Count (c)	JSP/Servlets with the highest number of errors.
JSP/Servlets - Service Time (ms)	JSP/Servlets using the highest time on average.
Thread Pools - Highest Pool Usage	Thread pools which are being used most of the time.

Table 5. WebLogic application servers
Quick-View Chart Name	Description
Requests - Slowest Response Times (ms)	Request with the longest response time on average.
JVM - Heap Usage	Capacity and Used memory.
JVM - Garbage Collector	Garbage collector rate and overhead.
Work Managers - Most Waiters	Work managers with the highest number of waiters in their queues on average.
EJBs - Highest Cache Miss %	EJBs with the highest cache miss percentage on average.
EJBs - Highest Pool Miss %	EJBs with the highest pool miss percentage on average.
JSPs/Servlets - Most Invocations	JSPs/Servlets with the most invocations.
Execute Queues - Most Pending Requests	Execute queues with the highest pending request count in their queues on average.
Local JMS Servers - Most Pending Messages	JMS servers with the highest pending message count on average.
JDBC Data Source - Most Connection Waiters	JDBC data sources with the highest number of threads waiting for a connection on average.

Table 6. WebSphere application servers
Quick-View Chart Name	Description
Requests - Slowest Response Time (ms)	Requests with longest response time on average.
JVM - Heap Usage	Capacity and Used memory.
Thread Pools - Highest Pool Usage %	Thread pools with highest utilization on average.
JDBC Data Source - Most Threads Waiting	JDBC data sources with highest number of threads waiting for a collection.
JSPs/Servlets - Most Popular	JSPs/Servlets accessed (requested) the most.
JCA Pools - Most Waiters	JCA Pools with highest number of threads waiting on average.
EJBs - Lowest Hit Ratio %	EJB pools with lowest hit ratios.

Adding charts to the Quick View

To add or remove charts in Quick View:

On the navigation panel, under Dashboards, click Application Servers > Monitor. The Application Servers Monitor dashboard opens.

Click the Servers tile.

Click Quick View, or the edit icon beside the text.

The Quick View Selection dialog box opens.

Select any of the source metrics listed in the dialog box.

Click OK to close the dialog box. The Quick View refreshes.

Viewing JVM data for systems or servers

You can access Java Virtual Machine (JVM) details for an MBean Server from either the Systems view or the Servers view of the Application Servers Monitor dashboard.

To access JVM data from the Systems view:

On the navigation panel, under Dashboards, click Application Servers > Monitor. The Application Servers Monitor dashboard opens.

Click the Systems tile.

Select a system from the System table on the left.

In the system details view on the right, click the health status icon in the JVM column.

Figure 18. A popup appears, displaying Heap Usage and GC Rate & Overhead charts, as well as basic JVM information.

Click the JVM Name or the Heap Usage chart to open the Java Virtual Machine (JVM) view.


	TIP: Use the breadcrumb trail at the top of the view to return to the Application Servers Monitor dashboard.

To access JVM data from the Servers tile:

On the navigation panel, under Dashboards, click Application Servers > Monitor. The Application Servers Monitor dashboard opens.

Click the Servers tile.

Select a server in the Server table on the left.

In the server details view on the right, do one of the following:

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Hover your mouse over the JVM link in the server details area to open a dwell that displays the Heap Usage and GC Rate & Overhead charts. Click the Heap Usage chart in this dwell to open the JVM view.

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Click JVM in the server details view. The JVM view opens.

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Click Quick View, located just below the server details view, and select JVM - Heap Usage from the dialog box that opens. Click OK. The JVM Heap Usage chart appears in the Quick View area.

Java Virtual Machine (JVM) view

The top portion of this view lists the System, Server, and Health information. Click any status icon to review the health of that component. For more information about the rules that determine the Java Virtual Machine (JVM) health status, review the rules on the Foglight Rule Management dashboard (Dashboards > Administration > Rules & Notifications > Rule Management > search for “JVM”).

The charts in the middle section give you a quick view of the JVM Heap Used and Committed, Garbage Collection (GC), and Process Metrics, including:

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the amount of memory used and available

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the number of garbage collection occurrences per second (rate) and the amount of time spent performing garbage collections compared to the interval that Foglight is reporting (overhead)

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the amount of CPU the threads are using

Figure 19. Charts available in the JVM view.

In addition to viewing the heap usage of your JVM, it is important to understand how frequently garbage collection is being performed (GC Rate) and the percentage of time your JVM is spending performing garbage collection (GC Overhead).

To see more details about the JVM, click one of the tabs in the JVM view below the charts. For more information, see JVM view.

Monitoring Applications


	NOTE: Applications monitoring is not applicable to Foglight for JMX.

The Applications tile of the Application Servers Monitor dashboard lists all the applications running in a monitored environment (domain, cell, cluster topology, server group, or partition) and the related components, such as Application Pool, EJBs, Web Applications, and the Web Services health status. From here you can drill down to explore the components in further detail.

Use this view to investigate the applications running in your infrastructure. Select an application in the table to display a list of the various types of components that are running in a specific application and their deployment details.

From this view, you can perform the following actions:

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Review the number of applications running in your infrastructure

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Identify the application type

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Identify the availability (average for the timeline range specified)

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Identify the application deployments (number of servers the application is deployed on)

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Select a health status icon for a component to display a dwell listing the various types of that component that are running on a specific application