Device Fault Manager (DFM) is the module or application that would give you these kind of alerts;
a quick overview about DFM can be found here
first I recommend to install all available updates and patches for LMS;
after the initial discovery of LMS to get your devices into DCR you have to import device into DFM as described here
DFM is working with SNMP polling, thus you should get the events in the AAD (Alerts and Activities Display) if DFM has SNMP access to your devices;
Be aware, that DFM counts non-unicast packekts for the HighBroadcast Rate (broadcast and multicast packets; ifInNUcastPkts + ifOutNUcastPkts)
also read the user guide for DFM to get a general understanding of DFM
