message: Add aggregated cost dimensions to the CostGraph, typically used for
  load-balancing decisions.
diff: @@ -76,4 +76,14 @@ message CostGraphDef {
  bool inaccurate = 17;
  }
  repeated Node node = 1;
  +
  + // Total cost of this graph, typically used for balancing decisions.
  + message AggregatedCost {
  + // Aggregated cost value.
  + float cost = 1;
  +
  + // Aggregated cost dimension (e.g. 'memory', 'compute', 'network').
  + string dimension = 2;
  + }
  + repeated AggregatedCost cost = 2;
  }
  