Dotcom-Monitor’s throttling option is used to limit the number of alerts sent in response to an error condition. Without this feature, the number of alerts from a single outage can become burdensome. For example, assume there are 10 monitoring devices with a monitoring frequency of once per minute, and a global outage occurs. By default, Dotcom-Monitor would send alerts at the rate of 10 per minute for the entire duration of the outage.
You can set up throttling on a device settings page, under the Alerts tab.