Total of metrics in legend


I have the graph that consists of 2 metrics:

  1. open website (msec)
  2. login to website (msec)

both lines are stacked on the graph. I need to see the total (sum of 2 metrics values) in legend (min,max,avg).
Please help how that could be achieved.

If your datasource don’t support calculation between metrics you may try out the MetaQueries plugin.