The isAggregated() function tells eHealth to combine the value for all instances of this element.
for example, add the pct errors in for all interfaces on this device.
At the parent level, the element variable report shows isAggregated() for
Pct errors in
To determine the actual formula in use drill down to the interface level and run an element variable report.
Here we see the same metric and it shows the calculations used by the isAggregated function.
The actual formula will be different from device to device and metric to metric.