If you go in SMGR-->Configurations-->SMGR-->Trap Listener, you'll see SMGR's default trap receiver. You defined the SNMPv2/v3 strings when you deployed the OVA. Usually it's port 10162 and a community of like "avaya" or "initial"
If you show run in your G450, you'll see the SNMP config. You can add a SNMP destination of SMGR
You can see in SMGR's alarms viewer the traps the G450 is sending.
That would be if the G450 is sending SNMP traps advising of the condition. Its possible you have SNMP polling on port 161 enabled on the gateway. Stuff like "snmp poll: whats the temperature". Sure, the gateway has thresholds for "getting hot in here - MAJOR!" and "I'm cookin, time to shutdown - CRITICAL!" and those might be 35 and 40C respectively.
Your SNMP guys might poll temperature and if it's always 17C and over a few days it climbs to 25C, it might not be enough for the G450 to send an SNMP trap, but your SNMP guys logic might be "if temp on device is >X degrees above baseline monitoring, then make alarm"
So, maybe they're just polling the G450 about broadcast packets. Now, 1.431655765333E8 ... does that mean 143,165,576 packets/second? like 1.43x10^8? That could be a serious problem.
I've done a command within vlan 1:
(super-if:Vlan 1)# no ip directed-broadcast
It was on a real dumpster fire of a network. Windows 10 machines getting IPv6 and IPv4 addresses. What happens is if the Win10 box gets IPv4 192.168.1.2/24, they all ARP 192.168.1.3, 192.168.1.4, etc. So, 255 PCs ARP broadcasting 255 others for 65535 broadcasts. Not forwarding those broadcasts in the G450 helped a touch, but that was in major panic mode, like the gateway with PRI and phones at 1 location reporting upwards of 50% packet loss per call.
Having a quick look through the MIB files, it would appear that the G450 adopts pretty standard MIBs - so things like "SNMP poll interface status" and stuff would be nothing too proprietary. To say, the SNMP world has some standards for real basic stuff and on first glance, I might think Avaya adopted that methodology so you could SNMP poll 'broadcast packets per second' the same way on a G450 as any other common data switch that chose to adopt it.
Ask your guys if it was a poll or a trap. If it's a trap, you can make it hit SMGR to see for yourself. If it's a poll, then maybe they're right. Your next question to the LAN guys is "why are bajillions of broadcasts hitting my voip gateway?