Added list of items that were used for risk calculation

changes.proto

@@ -613,7 +613,10 @@ message ChangeMetadata {
   HealthChange ErrorHealthChange = 15;
   HealthChange PendingHealthChange = 16;
 
+  // The status of the risk calculation
   RiskCalculationStatus riskCalculationStatus = 19;
+
+  // The risks that are related to this change
   repeated Risk risks = 20;
 
   // The number of low risks in this change
@@ -624,6 +627,14 @@ message ChangeMetadata {
 
   // The number of high risks in this change
   int32 numHighRisk = 23;
+
+  // A list of references to the items that taken into account when calculating
+  // risks. Due to inherent limitations in the way we calculate risks, for large
+  // changes we might need to consider only a subset of the blast radius. This
+  // means that risks might be missed if they relate to items that weren't
+  // considered. This list is used to show the user which items were considered,
+  // and which were not.
+  repeated Reference sampledItemsForRiskCalculation = 24;
 }
 
 // user-supplied properties of this change