reduce amount of logs generated by ExternalDnsWithTracingClientServerTest

src/csharp/Grpc.IntegrationTesting/ExternalDnsWithTracingClientServerTest.cs

@@ -31,7 +31,7 @@ using NUnit.Framework;
 namespace Grpc.IntegrationTesting
 {
     /// <summary>
-    /// See https://github.com/grpc/issues/18074, this test is meant to
+    /// See https://github.com/grpc/grpc/issues/18074, this test is meant to
     /// try to trigger the described bug.
     /// Runs interop tests in-process, with that client using a target
     /// name that using a target name that triggers interaction with
@@ -48,9 +48,9 @@ namespace Grpc.IntegrationTesting
         public void Init()
         {
             // TODO(https://github.com/grpc/grpc/issues/14963): on linux, setting
-            // these environment variables might not actually have any affect.
+            // these environment variables might not actually have any effect.
             // This is OK because we only really care about running this test on
-            // Windows, however, a fix made for $14963 should be applied here.
+            // Windows, however, a fix made for #14963 should be applied here.
             Environment.SetEnvironmentVariable("GRPC_TRACE", "all");
             Environment.SetEnvironmentVariable("GRPC_VERBOSITY", "DEBUG");
             newLogger = new SocketUsingLogger(GrpcEnvironment.Logger);
@@ -59,10 +59,12 @@ namespace Grpc.IntegrationTesting
             server = new Server(new[] { new ChannelOption(ChannelOptions.SoReuseport, 0) })
             {
                 Services = { TestService.BindService(new TestServiceImpl()) },
-                Ports = { { "[::1]", ServerPort.PickUnused, ServerCredentials.Insecure } }
+                Ports = { { "[::1]", ServerPort.PickUnused, ServerCredentials.Insecure } },
+                // reduce the number of request call tokens to
+                // avoid flooding the logs with token-related messages
+                RequestCallTokensPerCompletionQueue = 3,
             };
             server.Start();
-
             int port = server.Ports.Single().BoundPort;
             channel = new Channel("loopback6.unittest.grpc.io", port, ChannelCredentials.Insecure);
             client = new TestService.TestServiceClient(channel);