Add combined CASTOR+CTA plot to Data Volume dashboard in Grafana
The Grafana Volume sent to Tape plots get their input from InfluxDB for both CASTOR and CTA. Currently there are separate plots for CASTOR traffic and CTA traffic. We need an additional plot showing the sum of CASTOR+CTA traffic.
As the data source is already present, this is simply a case of creating a new chart. It should be done before we go to production in CTA so that the data can be seen by management.