Issue

After the KATA/Sensor receives traffic, no traffic information is visible on the KATA Dashboard.

Cause

If the traffic is less than 1 mbps, it will not be shown on the graphs

Solution

Check by the following.
Log in to CN/Sensor's ssh console
Execute the command

sudo -i

iptraf-ng

Select General interface statistics, you can see the real-time traffic information of the network interface

However, such low traffic is NOT normal, and if there is no reasonably high traffic on span network interfaces on sensors, check your network configuration.