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Foglight Experience Monitor 5.8.1 - User Guide

Installing and configuring Multi-appliance clusters Configuring the appliance Specifying monitored web traffic Transforming monitored URLs Managing applications Foglight components and the appliance Using the console program Troubleshooting the appliance Appendix: Third party software Monitoring the user experience Customizing reports The alarm system Integrating the appliance SOAP-based web services

Types of metric views

There are several different types of pages that allow you to examine a metric from a different perspective.

All Metrics View

Displays a table showing all metrics for the selected resource.

Metric View

Displays a single metric for the resource in a chart or table view.

Metric Analysis

You can run queries that allow you to analyze specific metrics in the system. These queries locate resources that exhibit the most extreme values for the metric that you have selected.

Common report properties were outlined in the previous section. The following sections offer an overview of each type of metric page, and their unique properties.

For more details, refer to these topics:

Useful metrics to monitor

Some of the more common metrics utilized by Foglight Experience Monitor administrators are metrics that are time and usage based. For example, during the monitoring of traffic if the administrator is alerted to the fact that the Site SLA for Page End-to-End time is consistently not being met further investigation needs to take place.

By looking at the Page End-to-End and Page Processing metrics for the site, the administrator may see that the Processing time is increasing therefore causing an adverse effect on the end user community. Conversely, if the Page Processing Time metric is low, and the Page Client Time metric is increasing this could be network congestion or a specific subnet congestion issue (if all of the problems are on one subnet).

The use of alarms and general reports allow the monitoring of the over all health of applications, sites and systems. The monitoring and use of alarms on individual services and applications allow for the adherence to and the support of Service Level Objectives (SLO) and business function availability.

The following table represents a list of the more common metrics to monitor.

User Count

User Count

Count

End-to-End Time

Command Processing Time

Count

Count

Page End-to-End Time

Page End-to-End Time

Service End-to-End Time

Page End-to-End Time

Command Response Time

Page End-to-End Time

Page End-to-End Time

Page Processing Time

Page Processing Time

Service Processing Time

Page Processing Time

Command Client Time

Page Processing Time

Page Processing Time

4xx Error Counts

Page Client Time

Service

End-to-End Time Level

Page

Connection Count

Command Network Latency

Page Network Latency

Page Network Latency

Success Ratio

End-to-End Time

Service Level

Service Processing Time

Service Level

Page Stop Count

 

 

 

 

Processing

Time

Service Level

 

Page Client Time

 

 

 

All Metrics View

The All Metrics View page provides a comprehensive view of a selected resource. In this view, you can see all metrics available for a given resource on a single page.

You can display data for any of these time groupings by clicking the appropriate button.

5-Minute Interval

5 minute increments, requiring potentially long calculation times for some chart types. Best accompanied with short Time Range definitions.

Hour

Hourly increments, requiring potentially long calculation times for some chart types.

Day

Daily increments.

Week

Weekly increments.

Month

Monthly increments.

Use the lists to the right of the selected time grouping to specify the exact time interval you would like to see.

The Alarms section in the All Metrics View provides a list of alarms that have been triggered by this resource.

Figure 16. Alarm summaries

Metric View

The Metric View page provides a detailed view of a single metric in a chart or table view.

Figure 17. Metric View page

A metric box, displaying the currently selected metric’s name, is always present in the first row of controls. This metric box can also be clicked to display a list of other metrics in the current metric’s category. Use this to select another metric to view.

For standard metrics, a statistics box appears beside the metric box that allows you to select the type of value to display.

Maximum

The largest monitored value for the selected metric over the defined time interval (for example, the maximum statistic for the Page End-To-End Time metric shows the longest page end-to-end time for the given time period or time range).

Minimum

The smallest monitored value for the selected metric over the defined time interval (for example, the minimum statistic for the Page End-To-End Time metric shows the shortest page end-to-end time for the given time period or time range).

Mean

An average of all the recorded values for the selected metric over the defined time interval (for example, the mean statistic for the page end-to-end time metric shows the average of all page end-to-end times for the given period or time range – the sum of all page end-to-end times divided by the number of page downloads).

Standard Deviation

A statistical measure of the spread or variability of the individual data points observed for the metric, for the defined time interval (for example, the standard deviation statistic for the Page End-To-End Time metric shows how widely or narrowly distributed the recorded download time values are from the mean download time). Standard deviation is calculated by taking the square root of the variance, where the variance is the average of the square of the distance of each data point from the mean.

You also have the option of choosing All from the box to simultaneously display all statistics contained in the chosen metric.

Use the All statistics option to display minimum, mean, maximum, and standard deviation values for a metric.

The Time Range controls are also found in the customization panel, and allow you to specify a specific time range for which you would like to see data. Click Time Range to specify a custom time range for the display. The boxes to the right allow to specify the desired starting and ending dates and times for the display.

The Detail box allows you to specify the level of detail (for example, hourly, daily) in the data that you would like to view. This selection applies only when you have chosen a custom time range.

The appliance generally displays the highest granularity of data available unless:

In these cases, the appliance displays the most detailed data available based on your request.

On Metric View pages, you can typically find a Diagnosis section below the data chart. Links found in this section allow you to explore other resources associated with that which you are currently examining.

Metric View pages typically end with a Diagnosis section that allow you to analyze related resources.

If for example, you are viewing a metric for a web page that includes page components (for example, graphics files, style sheets, Javascript files), three links appear in the Diagnosis section: Hit, Root Cause Explorer, and Create a Service Based on this Page.

Clicking Hits displays a pop-up window that displays the list of page components.

Clicking Root Cause Explorer takes you into Root Cause Explorer mode.

In this mode, the Analysis Report is restricted to a subset of child resources (for example, hits) associated with a parent resource (for example, web page).

In the above screenshot, the Metric Analysis page displays only those hits that are associated with the web page you are analyzing. All the standard report functionality is available in this mode; it is just restricted to the subset of resources in question. This feature allows you to discover the possible causes of performance problems or errors that are occurring with the parent resource.

Click Create a Service Based on this Page to move to the Services > Edit page. See “Managing service definitions” in the Foglight Experience Monitor Installation and Administration Guide for more information about creating Services.

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