The top N tab displays trend charts showing the top contributors to application transaction volume and how the top contributors vary over time. For example, you can view the top URIs for a specific host or all hosts.
This tab includes a control bar which allows you to select
the host and service for which you would like to view
top n trend data and the type of chart to display. You can also
select a the specific time interval (see Chapter 10, Selecting a time period ),
and filter on specific data
(see Chapter 11, Filtering).
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Note |
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When you have made changes to the selections for the chart, including creating a filter, 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 top n charts are available for understanding the top contributors to HTTP transaction volume.
You can use the Units selector to choose the performance measurement used to calculate and display the top contributors. The following units are available:
The legend in the Top N services chart shows the top
contributors for the selected interval. The outlined
time stamp, for example
,
on the x-axis indicates the currently
selected interval. You can select an interval and
see the top contributors in that interval by
clicking with the
mouse button on the bar corresponding to the
interval of interest. Each other bar in the chart
will then be recolored so that it shows the transaction volume
associated with the top contributors in the currently selected
interval. This allows you to see how the top
contributors change over time.
If the latest (right most) bar is selected and the
Time
setting is relative to now (for example
Last hour
see Chapter 10, Selecting a time period
,
the charts will be updated automatically and
always display the contributors for the most recent
minute.
The grey part of each bar represents transaction volume not attributable to the top N shown in the legend (ie it represents the contribution from other URIs, methods etc. that are not in the top N).
If the whole of a bar is grey, the transaction volume in its interval is not attributable to any of the top contributors in the currently selected interval. You can click on this bar to make it the currently selected interval and see its top contributors.
When Top servers,
Top clients, or
Top connections charts are displayed,
you can find out more information about an end host
by clicking on
to the left of the host address in the legend.
This will open the Lookup host dialog
using the end host address. If the
Lookup host dialog is already open,
then the dialog will be changed to show
information for the newly selected host. See
Chapter 12, End host information for more information.
You can use the legend in the services top N charts to drill-down into the service data. For example, if you are viewing a Top URI hosts chart and you notice that most of the activity involves one URI host, you can investigate which URIs for this host are being accessed by clicking with the mouse button on legend item that corresponds to the URI host. The Top URIs chart will then be displayed with a filter for the selected URI host applied.
See Chapter 11, Filtering for more information of filtering.
sFlowTrend-Pro allows you to filter information displayed in a Top
N services chart. This allows you to focus on
data that may be of interest. For example, when viewing
Top URIs, if you
only wanted to look at URIs accessed with HTTP GET, you could
set a filter httpMethod=="GET"
.
See Chapter 11, Filtering for details.