/common/simulation.proto

--- v14/common/simulation.proto 2023-10-18 04:25:32.000000000 +0000
+++ v15/common/simulation.proto 2023-10-18 04:25:33.000000000 +0000
@@ -156,6 +156,10 @@
   // Only search advertising channel type supports this field.
   optional int64 top_slot_impressions = 14;

+  // Projected number of interactions.
+  // Only discovery advertising channel type supports this field.
+  optional int64 interactions = 20;
+
   // When SimulationModificationMethod = UNIFORM or DEFAULT,
   // target_cpa_micros is set.
   // When SimulationModificationMethod = SCALING,
@@ -255,6 +259,10 @@
   // Projected number of top slot impressions.
   // Only search advertising channel type supports this field.
   int64 top_slot_impressions = 8;
+
+  // Projected number of interactions.
+  // Only discovery advertising channel type supports this field.
+  int64 interactions = 9;
 }

 // Projected metrics for a specific target impression share value.