Node monitoring and sending integral alerts by e-mail are carried out by EMS "Check of mass breakaways of communication" monitor. The monitor supervises a certain node or a group of nodes. If a node includes nested nodes, the monitors will consider them too.
Configurable parameters of the monitor:
Period which is set to 10 minutes by defaultPercent — percent of devices with communication breakaway above which an alert is generated (50 percent by default)
To set up the monitor, a node should be added to a whitelist 
. When "Whitelist" button is clicked, a window with the list of nodes opens. Select required nodes and click 
to add a node to the list or 
to delete it. After the selection, the node turns green. Click "Accept" button.
The monitor is set up, from now on, an integral alert will be sent to a predetermined e-mail of EMS user in case of communication failure (on more than 50% of the devices by default).
To get notifications by e-mail, "Sending alert messages to e-mail" should be set.