there is no GC generation 3

src/csharp/Grpc.IntegrationTesting/ClientRunners.cs

@@ -186,8 +186,8 @@ namespace Grpc.IntegrationTesting
                 statsResetCount.Increment();
             }
 
-            GrpcEnvironment.Logger.Info("[ClientRunnerImpl.GetStats] GC collection counts: gen0 {0}, gen1 {1}, gen2 {2}, gen3 {3} (histogram reset count:{4}, seconds since reset: {5})",
-                GC.CollectionCount(0), GC.CollectionCount(1), GC.CollectionCount(2), GC.CollectionCount(3), statsResetCount.Count, secondsElapsed);
+            GrpcEnvironment.Logger.Info("[ClientRunnerImpl.GetStats] GC collection counts: gen0 {0}, gen1 {1}, gen2 {2}, (histogram reset count:{3}, seconds since reset: {4})",
+                GC.CollectionCount(0), GC.CollectionCount(1), GC.CollectionCount(2), statsResetCount.Count, secondsElapsed);
 
             // TODO: populate user time and system time
             return new ClientStats

src/csharp/Grpc.IntegrationTesting/QpsWorker.cs

@@ -100,8 +100,8 @@ namespace Grpc.IntegrationTesting
             await tcs.Task;
             await server.ShutdownAsync();
 
-            GrpcEnvironment.Logger.Info("GC collection counts (after shutdown): gen0 {0}, gen1 {1}, gen2 {2}, gen3 {3}",
-                GC.CollectionCount(0), GC.CollectionCount(1), GC.CollectionCount(2), GC.CollectionCount(3));
+            GrpcEnvironment.Logger.Info("GC collection counts (after shutdown): gen0 {0}, gen1 {1}, gen2 {2}",
+                GC.CollectionCount(0), GC.CollectionCount(1), GC.CollectionCount(2));
         }
     }
 }

src/csharp/Grpc.IntegrationTesting/ServerRunners.cs

@@ -154,8 +154,8 @@ namespace Grpc.IntegrationTesting
         {
             var secondsElapsed = wallClockStopwatch.GetElapsedSnapshot(reset).TotalSeconds;
 
-            GrpcEnvironment.Logger.Info("[ServerRunner.GetStats] GC collection counts: gen0 {0}, gen1 {1}, gen2 {2}, gen3 {3} (seconds since last reset {4})",
-                GC.CollectionCount(0), GC.CollectionCount(1), GC.CollectionCount(2), GC.CollectionCount(3), secondsElapsed);
+            GrpcEnvironment.Logger.Info("[ServerRunner.GetStats] GC collection counts: gen0 {0}, gen1 {1}, gen2 {2}, (seconds since last reset {3})",
+                GC.CollectionCount(0), GC.CollectionCount(1), GC.CollectionCount(2), secondsElapsed);
 
             // TODO: populate user time and system time
             return new ServerStats