The graph for System Interface is not available for the WebUI

The graph could be located by :

Monitoring Center > Dashboard > Graph > Add Graph > Select System Interface and its parameters to be shown
After investigating the issue, it appears that there are no commands available to write data into the System Interface database. 

In this solution, we retrieve the data using the CLI command "show interface" and input the relevant parameters into the database.

The testing can be done by accessing the graph page on the WebUI 

Monitoring Center > Dashboard > Graph > Add Graph > Select System Interface and its parameters to be shown
A graph will be shown on that interface, whereas previously, there was no graph available for display.