Gateway firewall flow table usage for UDP on logical router vmwNsxTDataCenterEntityId has reached vmwNsxTDataCenterFirewallUDPFlowUsage% which is at or above the high threshold value of vmwNsxTDataCenterSystemUsageThreshold%. New flows will be dropped by Gateway firewall when usage reaches the maximum limit. Action required: Log in as the admin user on Edge node and invoke the NSX CLI command `get firewall <LR_INT_UUID> interface stats | json` by using right interface uuid and check flow table usege for UDP flows. Check traffic flows going through the gateway is not a DOS attack or anomalous burst. If the traffic appears to be within the normal load but the alarm threshold is hit, consider increasing the alarm threshold or route new traffic to another Edge node.