Rate Metrics

The Dynamic and Custom view types let you select metric families and metrics to display for the selected managed item or group. For some metrics, two additional options are available: Average Rate and Total Rate. These Rate variants represent a “per second” value for the metric, achieved by dividing the raw sample value by the number of seconds in the sample’s poll period.
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The Dynamic and Custom view types let you select metric families and metrics to display for the selected managed item or group. For some metrics, two additional options are available: Average Rate and Total Rate. These Rate variants represent a “per second” value for the metric, achieved by dividing the raw sample value by the number of seconds in the sample’s poll period.
The “Average Rate” and “Total Rate” variants are aggregated differently across managed items when a group is selected for reporting. They are also aggregated differently when a selected device has child items that are monitored, or when the selected time period requires aggregation. For example, in a table, a single value can be shown that represents the aggregated result of one hour of samples: 12 samples from five-minute polling are aggregated into a single value. In this case, using “Average Rate” would average out the “rate” values for the 12 samples, where “Total Rate” would simply sum them.
The following calculations illustrate the difference:
Average Rate (AvgRate) = ((sample1/duration1) + (sample2/duration2) + (sample3/duration3)) / numberOfSamples
Total Rate (TotalRate) = ((sample1/duration1) + (sample2/duration2) + (sample3/duration3))
For most situations, Average Rate is the preferable metric to use.
Examples
 
Particularly for the Composite Trend view type, selecting the more useful rate metric option can yield more revealing results. Average Rate is adequate for most situations. But if you select Total Rate for a view that reports on groups, you can see the total for all devices of a similar type, or for all devices in the same region, for example.
The Total Rate metric lets you see metrics for a device across all of its interfaces. For a device with child interfaces, you can see an average across all of its interfaces, or you can see totals per interface. Select trend chart settings that display data from each interface as a separate line.
In cases where you are reporting on subinterfaces, consider that each one has a rate of N bytes/sec. The rate per interface is an aggregation of rate data from all subinterfaces. Typically, you would select Total Rate to see a metric such as Bytes/second per interface. To see data from all subinterfaces, use Total Rate to see a Bytes/second total for all interfaces.
If you do an aggregation of the 12 samples from an hour time period, those samples would be averaged to get the Average Rate. They would be added together to get the Total Rate.