In IntAlert.cfg, if an interface is specified with an error rate of 10, it will trigger the alert if the interface encounters 10% errors for the last poll period.
If the interface is specified with #10 as the error rate, it will trigger the alert if the average error rate exceeds this threshold.
Note: This means that if this alert is triggered, it may continue to trigger every single polling loop if the average is over the rate, thus causing continuous alerts until the average gets below the threshold.