Hi there,
That is an RRD graph, and looking at the colour scheme I'd hazard a guess that it is taken from the cacti monitoring tool.
https://www.cacti.net/
As for the stats, the Total value is the sum of the values for the time period displayed in the graph. So in an eight day period you received 66.88GB and transmitted 113.63GB of traffic out of the monitored interface.
The current value is the value of the latest time slice. The larger the time period being displayed the larger the time slice will become as you lose fidelity. On an 8 day graph, my guess is that a single slice is probably 15 minutes. So you have an average 6.70Mb inbound traffic over the current time slice (which we believe to be 15 minutes).
cheers,
Seb.