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The Host sFlow standard, http://www.sflow.org/developers/specifications.php, defines application performance metrics that a Host sFlow agent exports using the sFlow protocol. A number of popular applications now include sFlow monitoring. For example, sFlow agents are now available for popular web servers, providing scalable performance monitoring of large web server clusters and load balancers.
The Services tab presents application performance statistics for services that are being monitored using sFlow. This tab includes two sub-tabs:
The ability to directly relate server and application performance to the corresponding network traffic is a key element in unifying management of cloud environments.
The counters tab shows how the overall volume of application transactions varies over time. It uses stacked area charts to display the application performance counters.
This tab includes a control bar which allows you to select the host and service for which you would like to view trends in transaction volumes, the application performance counters chart to display and the specific time interval (see Chapter 10, Selecting a time period ).
When you have made changes to the selections for the chart, you can save these selections in a bookmark (see Section 1.4, “Navigating around sFlowTrend-Pro using browser history and bookmarks”) so that you can easily return to the same chart at a later date.
The following charts are available:
Sometimes one performance counter value can be much smaller than the other performance counters, making it hard to see the the smaller counter value trend. In this case, you can remove the other counter trends from the chart by clicking on the corresponding legend items. For example, when viewing the HTTP status chart, clicking with the mouse button on 2xx status count/s in the legend will change the chart so that the 2xx status count/s trend is removed and the chart is rescaled, making the other trend lines more visible. You can remove all but one of the trend lines.You can redisplay a trend line by clicking on the corresponding legend item again.