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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

Analyzing metrics

Report sets provide you with a good summary of the state of affairs of your service delivery chain, and the component reports provide information on specific topics (for example, Content Performance). However, there are undoubtedly times when you need to actively probe deeper into the data collected by the appliance by viewing or analyzing the actual metrics that are used as building blocks for report sets.

The motivation specific users may have when analyzing data can vary as greatly as the collected data itself; thus, to facilitate searches, data is logically categorized into metric lists (for example, Page End-To-End Time, Command Timeout Count), and resource lists (for example, Server, Hit). Master lists of metrics and resources can be viewed by accessing the main Analysis menu.

For more details, refer to these topics:

Finding data based on metrics

The Metric Analysis page allows you to generate reports on specific metrics in the system and also provides access to all collected metrics. These reports locate resources that exhibit the most extreme values for the metric that you selected. The metrics are organized into the following areas:

Click the buttons to expand category and subcategory lists, then click a metric name to display its Metric Analysis page.

For a detailed description of each metric, see the Foglight Experience Monitor Metric Reference Guide.

Finding data based on resource

Resources are entities that the appliance monitors in your service delivery chain. Metrics are recorded for every resource (for example, web page, application, server) that the appliance monitors.

The Resource List page allows you to locate metrics for a specific resource in the system. The list of categories in the main Resource List page is organized identically to the metric list on the Metric Analysis page.

The Resource List page lets users explore metrics by first focusing on a system resource.

By clicking a category name, you can display a list of all resources for the category that Foglight Experience Monitor has monitored since it was first configured.

Clicking a category from the main Resource List displays all resources associated with the category.

Once you have located a resource whose data you want to examine, click its name to display an All Metrics View. This page is a summary of all metrics for the chosen resource, and is a good starting point for further investigation.

Very large lists are accompanied by standard navigation aids (for example, previous 200, next 200, and numbered page links). In addition to offering exhaustive listings, every category’s Resource List page also facilitates searches. You can configure your search criteria to help you refine a larger listing to a more concise listing.

To perform a search, configure your search by selecting the following criteria.

Protocol

Search using a specific TCP protocol including HTTP or HTTPs. For example, this criteria displays in the Page, Hit and SIte categories.

Look for:

Type the name of the resource for which you are looking. You can use an asterisk (*) as a wild card to define a segment of the string that matches any combination of characters.

Example: wildcard search *.asp

Interpret as a regular expression

Select this option to search using a regular expression. When left unchecked, the system interprets the text entered in the Look for box as a simple matching string.

Show URLs with original character encoding

Encoded URLs, which represent a sequence of characters from a particular character set that are paired with a whole number.

Show URLs with decoded characters

Decoded URLs, reveal translated characters that are easier to understand.

To perform a search, click a category to display its Resource List, enter the name of the resource for which you are searching in the text box, then click the Go button. Using the search criteria you can refine the list of hits using a wildcard search, using a POSIX regular expression. You can also display encoded or decoded characters in the URLs.

Using the Metric View and Metric Analysis pages

The appliance offers several perspectives from which you can view and analyze metrics. For more information, see Types of metric views. Although each type of view differs in the scope and depth presented, they all share similar properties that facilitate metric analysis, as well as navigation to other reports.

At the top of the Metric View page is a title that includes the resource or metric name. This title is typically accompanied by a summary of the time frame in which the data was collected.

Metric View and Metric Analysis pages contain a report (in the form of a chart or table) that represents the requested data for the particular resource, and these are always preceded by a customization panel that allows you to modify viewing parameters to further focus on the task at hand.

Customization can include time interval adjustments, amount of granularity used to generate the display, and the recompilation of data into a different view. Whenever adjustments are made to time periods and ranges, click the Go button to regenerate the page.

Customization panels, found at the top of Metric Views and Metric Analysis pages, allow data analysis from a variety of perspectives.

The controls available in the customization panel allow you to modify the display in a number of different ways. The controls that appear depend on the context, as well as the type of data being displayed.

Typically, you have control over the level of granularity at which the data is presented, as well as the period of time covered by the displayed data. When they appear in customization panels, the former is accessed with a Time Period box or Detail box (as a list of option buttons), and the latter, a Time Range box. The control options available depends on the type of metric that you are viewing.

The following list outlines the choices found on analysis pages and metric views.

Table 2. Setting time

Last 2 Hours

The previous 2 hours of data in 5-minute increments.

Last 24 Hours

The last 24 hours of data in hourly increments.

Last 7 Days

The last 7 days of data in daily increments.

Last 4 Weeks

The last 4 weeks of data in weekly increments.

Last 12 Months

The last year of data in monthly increments.

Last 5 Minutes

The last 5 minutes of data.

Last Full Hour

The last complete hour in 5-minute increments (for example, 1:00 – 1:59).

Last Full Day

The last full day (00:00 – 23:59) in 1 hour increments.

Last Full Week

The last completed week (Sunday – Saturday) in daily increments.

Last Full Month

The last calendar month in weekly increments, wherein the first included week is the first full week (for example, Sunday – Saturday) completely contained in that month.

The following list outlines the choices found only on analysis pages and metric view pages.

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.

Custom time periods can be created by administrators. For more information, see “Adding custom time periods” in the Foglight Experience Monitor Installation and Administration Guide.

In addition to time controls, some chart icons appear in the customization panel:

Bar Chart

Pie Chart

Line Chart

Stacked Bar Chart

Table

 

 

Click the icon to regenerate the display in the chosen format. The selection of chart types depends on the type of the measurement or metric being displayed.

When viewing metrics, you can select Show Baseline in the customization panel to display a baseline for the metric in the chart. The appliance accommodates hourly, daily, weekly, and monthly baselines, whose calculations are based on historical data that have been captured over a period of time. These historical baselines can be used to compare historical values to current measurements.

The values used to calculate baselines can also be configured by an administrator. For information on configuring baselines, see “Baseline calculations” in the Foglight Experience Monitor Installation and Administration Guide.

Baselines are available for standard, count, and percentage (or ratio) metrics. They are not available for distribution or reference counter metrics. For these metrics, the Show Baselines check box is not selected.

Baselines are also not available for these categories:

The option to Show Baselines is available when the data is viewed in line chart, table, or bar chart format.

When viewing a Metric Analysis page, the customization panel reiterates which metric is the focus of the report in the Based On box. As previously mentioned you can select an item in this box to shift to another Metric Analysis page for a metric in the same category.

The main Metric Analysis page offers access to categorized reports (left). When viewing a Metric Analysis page for a chosen metric, all other metrics in the same subcategory can also be accessed from within the report (right).

Any data displayed as a chart on a Metric Analysis page is accompanied by a colored legend. The resource names displayed in the legend are hyperlinks that allow you to drill down into that particular resource. If the data is formatted as a table the left-most column elements within the table are hyperlinks to resource-specific views.

Various links appear at the bottom of metric view or analysis pages.

Add an Alarm

Allows you to begin creating an alarm for the metric you are viewing (see Creating an alarm). This link does not appear for metrics that are not supported by alarms (for example, distribution metrics).

Link to this URL

Links to the actual URL of the resource. This link only appears for reports based on the Hit and Page categories.

Export to CSV

Links to a CSV file that contains the data displayed in this report.

Export to XML

Links to an XML file that contains the data displayed in this report.

Take Snapshot

Generates a snapshot for this report. This link also appears at the bottom of the Current System Status page.

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