diff --git a/bazel/grpc_deps.bzl b/bazel/grpc_deps.bzl
index db6256e467da4..ba2719dc0af0b 100644
--- a/bazel/grpc_deps.bzl
+++ b/bazel/grpc_deps.bzl
@@ -164,11 +164,11 @@ def grpc_deps():
     if "com_google_protobuf" not in native.existing_rules():
         http_archive(
             name = "com_google_protobuf",
-            sha256 = "e589e39ef46fb2b3b476b3ca355bd324e5984cbdfac19f0e1625f0042e99c276",
-            strip_prefix = "protobuf-fde7cf7358ec7cd69e8db9be4f1fa6a5c431386a",
+            sha256 = "7481c9c4c51317974f9508917926c00b9030bd9cc435afe355ac97e179c841f4",
+            strip_prefix = "protobuf-fbbe11ae493e1e1bab6cc396dfbb7b4de9fd8bd0",
             urls = [
-                "https://storage.googleapis.com/grpc-bazel-mirror/github.com/google/protobuf/archive/fde7cf7358ec7cd69e8db9be4f1fa6a5c431386a.tar.gz",
-                "https://github.com/google/protobuf/archive/fde7cf7358ec7cd69e8db9be4f1fa6a5c431386a.tar.gz",
+                "https://storage.googleapis.com/grpc-bazel-mirror/github.com/google/protobuf/archive/fbbe11ae493e1e1bab6cc396dfbb7b4de9fd8bd0.tar.gz",
+                "https://github.com/google/protobuf/archive/fbbe11ae493e1e1bab6cc396dfbb7b4de9fd8bd0.tar.gz",
             ],
         )
 
diff --git a/grpc.gemspec b/grpc.gemspec
index c99857566f942..47ae233257cb4 100644
--- a/grpc.gemspec
+++ b/grpc.gemspec
@@ -32,7 +32,7 @@ Gem::Specification.new do |s|
   s.require_paths = %w( src/ruby/lib src/ruby/bin src/ruby/pb )
   s.platform      = Gem::Platform::RUBY
 
-  s.add_dependency 'google-protobuf', '~> 3.13'
+  s.add_dependency 'google-protobuf', '~> 3.14.0.rc.1'
   s.add_dependency 'googleapis-common-protos-types', '~> 1.0'
 
   s.add_development_dependency 'bundler',            '>= 1.9'
diff --git a/src/csharp/Grpc.IntegrationTesting/Messages.cs b/src/csharp/Grpc.IntegrationTesting/Messages.cs
index 083dbb22af76b..9fe22e97de1a0 100644
--- a/src/csharp/Grpc.IntegrationTesting/Messages.cs
+++ b/src/csharp/Grpc.IntegrationTesting/Messages.cs
@@ -69,11 +69,32 @@ public static partial class MessagesReflection {
             "IAEoCRINCgV2YWx1ZRgCIAEoBToCOAEaMQoPUnBjc0J5UGVlckVudHJ5EgsK",
             "A2tleRgBIAEoCRINCgV2YWx1ZRgCIAEoBToCOAEaZwoRUnBjc0J5TWV0aG9k",
             "RW50cnkSCwoDa2V5GAEgASgJEkEKBXZhbHVlGAIgASgLMjIuZ3JwYy50ZXN0",
-            "aW5nLkxvYWRCYWxhbmNlclN0YXRzUmVzcG9uc2UuUnBjc0J5UGVlcjoCOAEq",
-            "HwoLUGF5bG9hZFR5cGUSEAoMQ09NUFJFU1NBQkxFEAAqbwoPR3JwY2xiUm91",
-            "dGVUeXBlEh0KGUdSUENMQl9ST1VURV9UWVBFX1VOS05PV04QABIeChpHUlBD",
-            "TEJfUk9VVEVfVFlQRV9GQUxMQkFDSxABEh0KGUdSUENMQl9ST1VURV9UWVBF",
-            "X0JBQ0tFTkQQAmIGcHJvdG8z"));
+            "aW5nLkxvYWRCYWxhbmNlclN0YXRzUmVzcG9uc2UuUnBjc0J5UGVlcjoCOAEi",
+            "JQojTG9hZEJhbGFuY2VyQWNjdW11bGF0ZWRTdGF0c1JlcXVlc3QiwgQKJExv",
+            "YWRCYWxhbmNlckFjY3VtdWxhdGVkU3RhdHNSZXNwb25zZRJyChpudW1fcnBj",
+            "c19zdGFydGVkX2J5X21ldGhvZBgBIAMoCzJOLmdycGMudGVzdGluZy5Mb2Fk",
+            "QmFsYW5jZXJBY2N1bXVsYXRlZFN0YXRzUmVzcG9uc2UuTnVtUnBjc1N0YXJ0",
+            "ZWRCeU1ldGhvZEVudHJ5EnYKHG51bV9ycGNzX3N1Y2NlZWRlZF9ieV9tZXRo",
+            "b2QYAiADKAsyUC5ncnBjLnRlc3RpbmcuTG9hZEJhbGFuY2VyQWNjdW11bGF0",
+            "ZWRTdGF0c1Jlc3BvbnNlLk51bVJwY3NTdWNjZWVkZWRCeU1ldGhvZEVudHJ5",
+            "EnAKGW51bV9ycGNzX2ZhaWxlZF9ieV9tZXRob2QYAyADKAsyTS5ncnBjLnRl",
+            "c3RpbmcuTG9hZEJhbGFuY2VyQWNjdW11bGF0ZWRTdGF0c1Jlc3BvbnNlLk51",
+            "bVJwY3NGYWlsZWRCeU1ldGhvZEVudHJ5Gj0KG051bVJwY3NTdGFydGVkQnlN",
+            "ZXRob2RFbnRyeRILCgNrZXkYASABKAkSDQoFdmFsdWUYAiABKAU6AjgBGj8K",
+            "HU51bVJwY3NTdWNjZWVkZWRCeU1ldGhvZEVudHJ5EgsKA2tleRgBIAEoCRIN",
+            "CgV2YWx1ZRgCIAEoBToCOAEaPAoaTnVtUnBjc0ZhaWxlZEJ5TWV0aG9kRW50",
+            "cnkSCwoDa2V5GAEgASgJEg0KBXZhbHVlGAIgASgFOgI4ASKlAgoWQ2xpZW50",
+            "Q29uZmlndXJlUmVxdWVzdBI7CgV0eXBlcxgBIAMoDjIsLmdycGMudGVzdGlu",
+            "Zy5DbGllbnRDb25maWd1cmVSZXF1ZXN0LlJwY1R5cGUSPwoIbWV0YWRhdGEY",
+            "AiADKAsyLS5ncnBjLnRlc3RpbmcuQ2xpZW50Q29uZmlndXJlUmVxdWVzdC5N",
+            "ZXRhZGF0YRpiCghNZXRhZGF0YRI6CgR0eXBlGAEgASgOMiwuZ3JwYy50ZXN0",
+            "aW5nLkNsaWVudENvbmZpZ3VyZVJlcXVlc3QuUnBjVHlwZRILCgNrZXkYAiAB",
+            "KAkSDQoFdmFsdWUYAyABKAkiKQoHUnBjVHlwZRIOCgpFTVBUWV9DQUxMEAAS",
+            "DgoKVU5BUllfQ0FMTBABIhkKF0NsaWVudENvbmZpZ3VyZVJlc3BvbnNlKh8K",
+            "C1BheWxvYWRUeXBlEhAKDENPTVBSRVNTQUJMRRAAKm8KD0dycGNsYlJvdXRl",
+            "VHlwZRIdChlHUlBDTEJfUk9VVEVfVFlQRV9VTktOT1dOEAASHgoaR1JQQ0xC",
+            "X1JPVVRFX1RZUEVfRkFMTEJBQ0sQARIdChlHUlBDTEJfUk9VVEVfVFlQRV9C",
+            "QUNLRU5EEAJiBnByb3RvMw=="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { },
           new pbr::GeneratedClrTypeInfo(new[] {typeof(global::Grpc.Testing.PayloadType), typeof(global::Grpc.Testing.GrpclbRouteType), }, null, new pbr::GeneratedClrTypeInfo[] {
@@ -91,7 +112,11 @@ public static partial class MessagesReflection {
             new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.ReconnectInfo), global::Grpc.Testing.ReconnectInfo.Parser, new[]{ "Passed", "BackoffMs" }, null, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.LoadBalancerStatsRequest), global::Grpc.Testing.LoadBalancerStatsRequest.Parser, new[]{ "NumRpcs", "TimeoutSec" }, null, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.LoadBalancerStatsResponse), global::Grpc.Testing.LoadBalancerStatsResponse.Parser, new[]{ "RpcsByPeer", "NumFailures", "RpcsByMethod" }, null, null, null, new pbr::GeneratedClrTypeInfo[] { new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.LoadBalancerStatsResponse.Types.RpcsByPeer), global::Grpc.Testing.LoadBalancerStatsResponse.Types.RpcsByPeer.Parser, new[]{ "RpcsByPeer_" }, null, null, null, new pbr::GeneratedClrTypeInfo[] { null, }),
-            null, null, })
+            null, null, }),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.LoadBalancerAccumulatedStatsRequest), global::Grpc.Testing.LoadBalancerAccumulatedStatsRequest.Parser, null, null, null, null, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.LoadBalancerAccumulatedStatsResponse), global::Grpc.Testing.LoadBalancerAccumulatedStatsResponse.Parser, new[]{ "NumRpcsStartedByMethod", "NumRpcsSucceededByMethod", "NumRpcsFailedByMethod" }, null, null, null, new pbr::GeneratedClrTypeInfo[] { null, null, null, }),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.ClientConfigureRequest), global::Grpc.Testing.ClientConfigureRequest.Parser, new[]{ "Types_", "Metadata" }, null, new[]{ typeof(global::Grpc.Testing.ClientConfigureRequest.Types.RpcType) }, null, new pbr::GeneratedClrTypeInfo[] { new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.ClientConfigureRequest.Types.Metadata), global::Grpc.Testing.ClientConfigureRequest.Types.Metadata.Parser, new[]{ "Type", "Key", "Value" }, null, null, null, null)}),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.ClientConfigureResponse), global::Grpc.Testing.ClientConfigureResponse.Parser, null, null, null, null, null)
           }));
     }
     #endregion
@@ -3866,6 +3891,966 @@ public sealed partial class RpcsByPeer : pb::IMessage<RpcsByPeer>
 
   }
 
+  /// <summary>
+  /// Request for retrieving a test client's accumulated stats.
+  /// </summary>
+  public sealed partial class LoadBalancerAccumulatedStatsRequest : pb::IMessage<LoadBalancerAccumulatedStatsRequest>
+  #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      , pb::IBufferMessage
+  #endif
+  {
+    private static readonly pb::MessageParser<LoadBalancerAccumulatedStatsRequest> _parser = new pb::MessageParser<LoadBalancerAccumulatedStatsRequest>(() => new LoadBalancerAccumulatedStatsRequest());
+    private pb::UnknownFieldSet _unknownFields;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pb::MessageParser<LoadBalancerAccumulatedStatsRequest> Parser { get { return _parser; } }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pbr::MessageDescriptor Descriptor {
+      get { return global::Grpc.Testing.MessagesReflection.Descriptor.MessageTypes[14]; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public LoadBalancerAccumulatedStatsRequest() {
+      OnConstruction();
+    }
+
+    partial void OnConstruction();
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public LoadBalancerAccumulatedStatsRequest(LoadBalancerAccumulatedStatsRequest other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public LoadBalancerAccumulatedStatsRequest Clone() {
+      return new LoadBalancerAccumulatedStatsRequest(this);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override bool Equals(object other) {
+      return Equals(other as LoadBalancerAccumulatedStatsRequest);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public bool Equals(LoadBalancerAccumulatedStatsRequest other) {
+      if (ReferenceEquals(other, null)) {
+        return false;
+      }
+      if (ReferenceEquals(other, this)) {
+        return true;
+      }
+      return Equals(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override int GetHashCode() {
+      int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
+      return hash;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override string ToString() {
+      return pb::JsonFormatter.ToDiagnosticString(this);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void WriteTo(pb::CodedOutputStream output) {
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      output.WriteRawMessage(this);
+    #else
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
+    #endif
+    }
+
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    void pb::IBufferMessage.InternalWriteTo(ref pb::WriteContext output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(ref output);
+      }
+    }
+    #endif
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public int CalculateSize() {
+      int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
+      return size;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(LoadBalancerAccumulatedStatsRequest other) {
+      if (other == null) {
+        return;
+      }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(pb::CodedInputStream input) {
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      input.ReadRawMessage(this);
+    #else
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
+            break;
+        }
+      }
+    #endif
+    }
+
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    void pb::IBufferMessage.InternalMergeFrom(ref pb::ParseContext input) {
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, ref input);
+            break;
+        }
+      }
+    }
+    #endif
+
+  }
+
+  /// <summary>
+  /// Accumulated stats for RPCs sent by a test client.
+  /// </summary>
+  public sealed partial class LoadBalancerAccumulatedStatsResponse : pb::IMessage<LoadBalancerAccumulatedStatsResponse>
+  #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      , pb::IBufferMessage
+  #endif
+  {
+    private static readonly pb::MessageParser<LoadBalancerAccumulatedStatsResponse> _parser = new pb::MessageParser<LoadBalancerAccumulatedStatsResponse>(() => new LoadBalancerAccumulatedStatsResponse());
+    private pb::UnknownFieldSet _unknownFields;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pb::MessageParser<LoadBalancerAccumulatedStatsResponse> Parser { get { return _parser; } }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pbr::MessageDescriptor Descriptor {
+      get { return global::Grpc.Testing.MessagesReflection.Descriptor.MessageTypes[15]; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public LoadBalancerAccumulatedStatsResponse() {
+      OnConstruction();
+    }
+
+    partial void OnConstruction();
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public LoadBalancerAccumulatedStatsResponse(LoadBalancerAccumulatedStatsResponse other) : this() {
+      numRpcsStartedByMethod_ = other.numRpcsStartedByMethod_.Clone();
+      numRpcsSucceededByMethod_ = other.numRpcsSucceededByMethod_.Clone();
+      numRpcsFailedByMethod_ = other.numRpcsFailedByMethod_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public LoadBalancerAccumulatedStatsResponse Clone() {
+      return new LoadBalancerAccumulatedStatsResponse(this);
+    }
+
+    /// <summary>Field number for the "num_rpcs_started_by_method" field.</summary>
+    public const int NumRpcsStartedByMethodFieldNumber = 1;
+    private static readonly pbc::MapField<string, int>.Codec _map_numRpcsStartedByMethod_codec
+        = new pbc::MapField<string, int>.Codec(pb::FieldCodec.ForString(10, ""), pb::FieldCodec.ForInt32(16, 0), 10);
+    private readonly pbc::MapField<string, int> numRpcsStartedByMethod_ = new pbc::MapField<string, int>();
+    /// <summary>
+    /// The total number of RPCs have ever issued for each type.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public pbc::MapField<string, int> NumRpcsStartedByMethod {
+      get { return numRpcsStartedByMethod_; }
+    }
+
+    /// <summary>Field number for the "num_rpcs_succeeded_by_method" field.</summary>
+    public const int NumRpcsSucceededByMethodFieldNumber = 2;
+    private static readonly pbc::MapField<string, int>.Codec _map_numRpcsSucceededByMethod_codec
+        = new pbc::MapField<string, int>.Codec(pb::FieldCodec.ForString(10, ""), pb::FieldCodec.ForInt32(16, 0), 18);
+    private readonly pbc::MapField<string, int> numRpcsSucceededByMethod_ = new pbc::MapField<string, int>();
+    /// <summary>
+    /// The total number of RPCs have ever completed successfully for each type.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public pbc::MapField<string, int> NumRpcsSucceededByMethod {
+      get { return numRpcsSucceededByMethod_; }
+    }
+
+    /// <summary>Field number for the "num_rpcs_failed_by_method" field.</summary>
+    public const int NumRpcsFailedByMethodFieldNumber = 3;
+    private static readonly pbc::MapField<string, int>.Codec _map_numRpcsFailedByMethod_codec
+        = new pbc::MapField<string, int>.Codec(pb::FieldCodec.ForString(10, ""), pb::FieldCodec.ForInt32(16, 0), 26);
+    private readonly pbc::MapField<string, int> numRpcsFailedByMethod_ = new pbc::MapField<string, int>();
+    /// <summary>
+    /// The total number of RPCs have ever failed for each type.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public pbc::MapField<string, int> NumRpcsFailedByMethod {
+      get { return numRpcsFailedByMethod_; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override bool Equals(object other) {
+      return Equals(other as LoadBalancerAccumulatedStatsResponse);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public bool Equals(LoadBalancerAccumulatedStatsResponse other) {
+      if (ReferenceEquals(other, null)) {
+        return false;
+      }
+      if (ReferenceEquals(other, this)) {
+        return true;
+      }
+      if (!NumRpcsStartedByMethod.Equals(other.NumRpcsStartedByMethod)) return false;
+      if (!NumRpcsSucceededByMethod.Equals(other.NumRpcsSucceededByMethod)) return false;
+      if (!NumRpcsFailedByMethod.Equals(other.NumRpcsFailedByMethod)) return false;
+      return Equals(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override int GetHashCode() {
+      int hash = 1;
+      hash ^= NumRpcsStartedByMethod.GetHashCode();
+      hash ^= NumRpcsSucceededByMethod.GetHashCode();
+      hash ^= NumRpcsFailedByMethod.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
+      return hash;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override string ToString() {
+      return pb::JsonFormatter.ToDiagnosticString(this);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void WriteTo(pb::CodedOutputStream output) {
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      output.WriteRawMessage(this);
+    #else
+      numRpcsStartedByMethod_.WriteTo(output, _map_numRpcsStartedByMethod_codec);
+      numRpcsSucceededByMethod_.WriteTo(output, _map_numRpcsSucceededByMethod_codec);
+      numRpcsFailedByMethod_.WriteTo(output, _map_numRpcsFailedByMethod_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
+    #endif
+    }
+
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    void pb::IBufferMessage.InternalWriteTo(ref pb::WriteContext output) {
+      numRpcsStartedByMethod_.WriteTo(ref output, _map_numRpcsStartedByMethod_codec);
+      numRpcsSucceededByMethod_.WriteTo(ref output, _map_numRpcsSucceededByMethod_codec);
+      numRpcsFailedByMethod_.WriteTo(ref output, _map_numRpcsFailedByMethod_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(ref output);
+      }
+    }
+    #endif
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public int CalculateSize() {
+      int size = 0;
+      size += numRpcsStartedByMethod_.CalculateSize(_map_numRpcsStartedByMethod_codec);
+      size += numRpcsSucceededByMethod_.CalculateSize(_map_numRpcsSucceededByMethod_codec);
+      size += numRpcsFailedByMethod_.CalculateSize(_map_numRpcsFailedByMethod_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
+      return size;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(LoadBalancerAccumulatedStatsResponse other) {
+      if (other == null) {
+        return;
+      }
+      numRpcsStartedByMethod_.Add(other.numRpcsStartedByMethod_);
+      numRpcsSucceededByMethod_.Add(other.numRpcsSucceededByMethod_);
+      numRpcsFailedByMethod_.Add(other.numRpcsFailedByMethod_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(pb::CodedInputStream input) {
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      input.ReadRawMessage(this);
+    #else
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
+            break;
+          case 10: {
+            numRpcsStartedByMethod_.AddEntriesFrom(input, _map_numRpcsStartedByMethod_codec);
+            break;
+          }
+          case 18: {
+            numRpcsSucceededByMethod_.AddEntriesFrom(input, _map_numRpcsSucceededByMethod_codec);
+            break;
+          }
+          case 26: {
+            numRpcsFailedByMethod_.AddEntriesFrom(input, _map_numRpcsFailedByMethod_codec);
+            break;
+          }
+        }
+      }
+    #endif
+    }
+
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    void pb::IBufferMessage.InternalMergeFrom(ref pb::ParseContext input) {
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, ref input);
+            break;
+          case 10: {
+            numRpcsStartedByMethod_.AddEntriesFrom(ref input, _map_numRpcsStartedByMethod_codec);
+            break;
+          }
+          case 18: {
+            numRpcsSucceededByMethod_.AddEntriesFrom(ref input, _map_numRpcsSucceededByMethod_codec);
+            break;
+          }
+          case 26: {
+            numRpcsFailedByMethod_.AddEntriesFrom(ref input, _map_numRpcsFailedByMethod_codec);
+            break;
+          }
+        }
+      }
+    }
+    #endif
+
+  }
+
+  /// <summary>
+  /// Configurations for a test client.
+  /// </summary>
+  public sealed partial class ClientConfigureRequest : pb::IMessage<ClientConfigureRequest>
+  #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      , pb::IBufferMessage
+  #endif
+  {
+    private static readonly pb::MessageParser<ClientConfigureRequest> _parser = new pb::MessageParser<ClientConfigureRequest>(() => new ClientConfigureRequest());
+    private pb::UnknownFieldSet _unknownFields;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pb::MessageParser<ClientConfigureRequest> Parser { get { return _parser; } }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pbr::MessageDescriptor Descriptor {
+      get { return global::Grpc.Testing.MessagesReflection.Descriptor.MessageTypes[16]; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public ClientConfigureRequest() {
+      OnConstruction();
+    }
+
+    partial void OnConstruction();
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public ClientConfigureRequest(ClientConfigureRequest other) : this() {
+      types_ = other.types_.Clone();
+      metadata_ = other.metadata_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public ClientConfigureRequest Clone() {
+      return new ClientConfigureRequest(this);
+    }
+
+    /// <summary>Field number for the "types" field.</summary>
+    public const int Types_FieldNumber = 1;
+    private static readonly pb::FieldCodec<global::Grpc.Testing.ClientConfigureRequest.Types.RpcType> _repeated_types_codec
+        = pb::FieldCodec.ForEnum(10, x => (int) x, x => (global::Grpc.Testing.ClientConfigureRequest.Types.RpcType) x);
+    private readonly pbc::RepeatedField<global::Grpc.Testing.ClientConfigureRequest.Types.RpcType> types_ = new pbc::RepeatedField<global::Grpc.Testing.ClientConfigureRequest.Types.RpcType>();
+    /// <summary>
+    /// The types of RPCs the client sends.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public pbc::RepeatedField<global::Grpc.Testing.ClientConfigureRequest.Types.RpcType> Types_ {
+      get { return types_; }
+    }
+
+    /// <summary>Field number for the "metadata" field.</summary>
+    public const int MetadataFieldNumber = 2;
+    private static readonly pb::FieldCodec<global::Grpc.Testing.ClientConfigureRequest.Types.Metadata> _repeated_metadata_codec
+        = pb::FieldCodec.ForMessage(18, global::Grpc.Testing.ClientConfigureRequest.Types.Metadata.Parser);
+    private readonly pbc::RepeatedField<global::Grpc.Testing.ClientConfigureRequest.Types.Metadata> metadata_ = new pbc::RepeatedField<global::Grpc.Testing.ClientConfigureRequest.Types.Metadata>();
+    /// <summary>
+    /// The collection of custom metadata to be attached to RPCs sent by the client.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public pbc::RepeatedField<global::Grpc.Testing.ClientConfigureRequest.Types.Metadata> Metadata {
+      get { return metadata_; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override bool Equals(object other) {
+      return Equals(other as ClientConfigureRequest);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public bool Equals(ClientConfigureRequest other) {
+      if (ReferenceEquals(other, null)) {
+        return false;
+      }
+      if (ReferenceEquals(other, this)) {
+        return true;
+      }
+      if(!types_.Equals(other.types_)) return false;
+      if(!metadata_.Equals(other.metadata_)) return false;
+      return Equals(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override int GetHashCode() {
+      int hash = 1;
+      hash ^= types_.GetHashCode();
+      hash ^= metadata_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
+      return hash;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override string ToString() {
+      return pb::JsonFormatter.ToDiagnosticString(this);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void WriteTo(pb::CodedOutputStream output) {
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      output.WriteRawMessage(this);
+    #else
+      types_.WriteTo(output, _repeated_types_codec);
+      metadata_.WriteTo(output, _repeated_metadata_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
+    #endif
+    }
+
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    void pb::IBufferMessage.InternalWriteTo(ref pb::WriteContext output) {
+      types_.WriteTo(ref output, _repeated_types_codec);
+      metadata_.WriteTo(ref output, _repeated_metadata_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(ref output);
+      }
+    }
+    #endif
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public int CalculateSize() {
+      int size = 0;
+      size += types_.CalculateSize(_repeated_types_codec);
+      size += metadata_.CalculateSize(_repeated_metadata_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
+      return size;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(ClientConfigureRequest other) {
+      if (other == null) {
+        return;
+      }
+      types_.Add(other.types_);
+      metadata_.Add(other.metadata_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(pb::CodedInputStream input) {
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      input.ReadRawMessage(this);
+    #else
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
+            break;
+          case 10:
+          case 8: {
+            types_.AddEntriesFrom(input, _repeated_types_codec);
+            break;
+          }
+          case 18: {
+            metadata_.AddEntriesFrom(input, _repeated_metadata_codec);
+            break;
+          }
+        }
+      }
+    #endif
+    }
+
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    void pb::IBufferMessage.InternalMergeFrom(ref pb::ParseContext input) {
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, ref input);
+            break;
+          case 10:
+          case 8: {
+            types_.AddEntriesFrom(ref input, _repeated_types_codec);
+            break;
+          }
+          case 18: {
+            metadata_.AddEntriesFrom(ref input, _repeated_metadata_codec);
+            break;
+          }
+        }
+      }
+    }
+    #endif
+
+    #region Nested types
+    /// <summary>Container for nested types declared in the ClientConfigureRequest message type.</summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static partial class Types {
+      /// <summary>
+      /// Type of RPCs to send.
+      /// </summary>
+      public enum RpcType {
+        [pbr::OriginalName("EMPTY_CALL")] EmptyCall = 0,
+        [pbr::OriginalName("UNARY_CALL")] UnaryCall = 1,
+      }
+
+      /// <summary>
+      /// Metadata to be attached for the given type of RPCs.
+      /// </summary>
+      public sealed partial class Metadata : pb::IMessage<Metadata>
+      #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+          , pb::IBufferMessage
+      #endif
+      {
+        private static readonly pb::MessageParser<Metadata> _parser = new pb::MessageParser<Metadata>(() => new Metadata());
+        private pb::UnknownFieldSet _unknownFields;
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public static pb::MessageParser<Metadata> Parser { get { return _parser; } }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public static pbr::MessageDescriptor Descriptor {
+          get { return global::Grpc.Testing.ClientConfigureRequest.Descriptor.NestedTypes[0]; }
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        pbr::MessageDescriptor pb::IMessage.Descriptor {
+          get { return Descriptor; }
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public Metadata() {
+          OnConstruction();
+        }
+
+        partial void OnConstruction();
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public Metadata(Metadata other) : this() {
+          type_ = other.type_;
+          key_ = other.key_;
+          value_ = other.value_;
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public Metadata Clone() {
+          return new Metadata(this);
+        }
+
+        /// <summary>Field number for the "type" field.</summary>
+        public const int TypeFieldNumber = 1;
+        private global::Grpc.Testing.ClientConfigureRequest.Types.RpcType type_ = global::Grpc.Testing.ClientConfigureRequest.Types.RpcType.EmptyCall;
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public global::Grpc.Testing.ClientConfigureRequest.Types.RpcType Type {
+          get { return type_; }
+          set {
+            type_ = value;
+          }
+        }
+
+        /// <summary>Field number for the "key" field.</summary>
+        public const int KeyFieldNumber = 2;
+        private string key_ = "";
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public string Key {
+          get { return key_; }
+          set {
+            key_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+          }
+        }
+
+        /// <summary>Field number for the "value" field.</summary>
+        public const int ValueFieldNumber = 3;
+        private string value_ = "";
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public string Value {
+          get { return value_; }
+          set {
+            value_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+          }
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public override bool Equals(object other) {
+          return Equals(other as Metadata);
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public bool Equals(Metadata other) {
+          if (ReferenceEquals(other, null)) {
+            return false;
+          }
+          if (ReferenceEquals(other, this)) {
+            return true;
+          }
+          if (Type != other.Type) return false;
+          if (Key != other.Key) return false;
+          if (Value != other.Value) return false;
+          return Equals(_unknownFields, other._unknownFields);
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public override int GetHashCode() {
+          int hash = 1;
+          if (Type != global::Grpc.Testing.ClientConfigureRequest.Types.RpcType.EmptyCall) hash ^= Type.GetHashCode();
+          if (Key.Length != 0) hash ^= Key.GetHashCode();
+          if (Value.Length != 0) hash ^= Value.GetHashCode();
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
+          return hash;
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public override string ToString() {
+          return pb::JsonFormatter.ToDiagnosticString(this);
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public void WriteTo(pb::CodedOutputStream output) {
+        #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+          output.WriteRawMessage(this);
+        #else
+          if (Type != global::Grpc.Testing.ClientConfigureRequest.Types.RpcType.EmptyCall) {
+            output.WriteRawTag(8);
+            output.WriteEnum((int) Type);
+          }
+          if (Key.Length != 0) {
+            output.WriteRawTag(18);
+            output.WriteString(Key);
+          }
+          if (Value.Length != 0) {
+            output.WriteRawTag(26);
+            output.WriteString(Value);
+          }
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
+        #endif
+        }
+
+        #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        void pb::IBufferMessage.InternalWriteTo(ref pb::WriteContext output) {
+          if (Type != global::Grpc.Testing.ClientConfigureRequest.Types.RpcType.EmptyCall) {
+            output.WriteRawTag(8);
+            output.WriteEnum((int) Type);
+          }
+          if (Key.Length != 0) {
+            output.WriteRawTag(18);
+            output.WriteString(Key);
+          }
+          if (Value.Length != 0) {
+            output.WriteRawTag(26);
+            output.WriteString(Value);
+          }
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(ref output);
+          }
+        }
+        #endif
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public int CalculateSize() {
+          int size = 0;
+          if (Type != global::Grpc.Testing.ClientConfigureRequest.Types.RpcType.EmptyCall) {
+            size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) Type);
+          }
+          if (Key.Length != 0) {
+            size += 1 + pb::CodedOutputStream.ComputeStringSize(Key);
+          }
+          if (Value.Length != 0) {
+            size += 1 + pb::CodedOutputStream.ComputeStringSize(Value);
+          }
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
+          return size;
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public void MergeFrom(Metadata other) {
+          if (other == null) {
+            return;
+          }
+          if (other.Type != global::Grpc.Testing.ClientConfigureRequest.Types.RpcType.EmptyCall) {
+            Type = other.Type;
+          }
+          if (other.Key.Length != 0) {
+            Key = other.Key;
+          }
+          if (other.Value.Length != 0) {
+            Value = other.Value;
+          }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public void MergeFrom(pb::CodedInputStream input) {
+        #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+          input.ReadRawMessage(this);
+        #else
+          uint tag;
+          while ((tag = input.ReadTag()) != 0) {
+            switch(tag) {
+              default:
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
+                break;
+              case 8: {
+                Type = (global::Grpc.Testing.ClientConfigureRequest.Types.RpcType) input.ReadEnum();
+                break;
+              }
+              case 18: {
+                Key = input.ReadString();
+                break;
+              }
+              case 26: {
+                Value = input.ReadString();
+                break;
+              }
+            }
+          }
+        #endif
+        }
+
+        #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        void pb::IBufferMessage.InternalMergeFrom(ref pb::ParseContext input) {
+          uint tag;
+          while ((tag = input.ReadTag()) != 0) {
+            switch(tag) {
+              default:
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, ref input);
+                break;
+              case 8: {
+                Type = (global::Grpc.Testing.ClientConfigureRequest.Types.RpcType) input.ReadEnum();
+                break;
+              }
+              case 18: {
+                Key = input.ReadString();
+                break;
+              }
+              case 26: {
+                Value = input.ReadString();
+                break;
+              }
+            }
+          }
+        }
+        #endif
+
+      }
+
+    }
+    #endregion
+
+  }
+
+  /// <summary>
+  /// Response for updating a test client's configuration.
+  /// </summary>
+  public sealed partial class ClientConfigureResponse : pb::IMessage<ClientConfigureResponse>
+  #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      , pb::IBufferMessage
+  #endif
+  {
+    private static readonly pb::MessageParser<ClientConfigureResponse> _parser = new pb::MessageParser<ClientConfigureResponse>(() => new ClientConfigureResponse());
+    private pb::UnknownFieldSet _unknownFields;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pb::MessageParser<ClientConfigureResponse> Parser { get { return _parser; } }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pbr::MessageDescriptor Descriptor {
+      get { return global::Grpc.Testing.MessagesReflection.Descriptor.MessageTypes[17]; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public ClientConfigureResponse() {
+      OnConstruction();
+    }
+
+    partial void OnConstruction();
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public ClientConfigureResponse(ClientConfigureResponse other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public ClientConfigureResponse Clone() {
+      return new ClientConfigureResponse(this);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override bool Equals(object other) {
+      return Equals(other as ClientConfigureResponse);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public bool Equals(ClientConfigureResponse other) {
+      if (ReferenceEquals(other, null)) {
+        return false;
+      }
+      if (ReferenceEquals(other, this)) {
+        return true;
+      }
+      return Equals(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override int GetHashCode() {
+      int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
+      return hash;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override string ToString() {
+      return pb::JsonFormatter.ToDiagnosticString(this);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void WriteTo(pb::CodedOutputStream output) {
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      output.WriteRawMessage(this);
+    #else
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
+    #endif
+    }
+
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    void pb::IBufferMessage.InternalWriteTo(ref pb::WriteContext output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(ref output);
+      }
+    }
+    #endif
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public int CalculateSize() {
+      int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
+      return size;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(ClientConfigureResponse other) {
+      if (other == null) {
+        return;
+      }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(pb::CodedInputStream input) {
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      input.ReadRawMessage(this);
+    #else
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
+            break;
+        }
+      }
+    #endif
+    }
+
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    void pb::IBufferMessage.InternalMergeFrom(ref pb::ParseContext input) {
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, ref input);
+            break;
+        }
+      }
+    }
+    #endif
+
+  }
+
   #endregion
 
 }
diff --git a/src/csharp/Grpc.IntegrationTesting/Test.cs b/src/csharp/Grpc.IntegrationTesting/Test.cs
index 8967af6f3d984..f82862a52c961 100644
--- a/src/csharp/Grpc.IntegrationTesting/Test.cs
+++ b/src/csharp/Grpc.IntegrationTesting/Test.cs
@@ -47,13 +47,19 @@ public static partial class TestReflection {
             "bmcuRW1wdHkaEy5ncnBjLnRlc3RpbmcuRW1wdHkyiQEKEFJlY29ubmVjdFNl",
             "cnZpY2USOwoFU3RhcnQSHS5ncnBjLnRlc3RpbmcuUmVjb25uZWN0UGFyYW1z",
             "GhMuZ3JwYy50ZXN0aW5nLkVtcHR5EjgKBFN0b3ASEy5ncnBjLnRlc3Rpbmcu",
-            "RW1wdHkaGy5ncnBjLnRlc3RpbmcuUmVjb25uZWN0SW5mbzJ/ChhMb2FkQmFs",
-            "YW5jZXJTdGF0c1NlcnZpY2USYwoOR2V0Q2xpZW50U3RhdHMSJi5ncnBjLnRl",
-            "c3RpbmcuTG9hZEJhbGFuY2VyU3RhdHNSZXF1ZXN0GicuZ3JwYy50ZXN0aW5n",
-            "LkxvYWRCYWxhbmNlclN0YXRzUmVzcG9uc2UiADKLAQoWWGRzVXBkYXRlSGVh",
-            "bHRoU2VydmljZRI2CgpTZXRTZXJ2aW5nEhMuZ3JwYy50ZXN0aW5nLkVtcHR5",
-            "GhMuZ3JwYy50ZXN0aW5nLkVtcHR5EjkKDVNldE5vdFNlcnZpbmcSEy5ncnBj",
-            "LnRlc3RpbmcuRW1wdHkaEy5ncnBjLnRlc3RpbmcuRW1wdHliBnByb3RvMw=="));
+            "RW1wdHkaGy5ncnBjLnRlc3RpbmcuUmVjb25uZWN0SW5mbzKGAgoYTG9hZEJh",
+            "bGFuY2VyU3RhdHNTZXJ2aWNlEmMKDkdldENsaWVudFN0YXRzEiYuZ3JwYy50",
+            "ZXN0aW5nLkxvYWRCYWxhbmNlclN0YXRzUmVxdWVzdBonLmdycGMudGVzdGlu",
+            "Zy5Mb2FkQmFsYW5jZXJTdGF0c1Jlc3BvbnNlIgAShAEKGUdldENsaWVudEFj",
+            "Y3VtdWxhdGVkU3RhdHMSMS5ncnBjLnRlc3RpbmcuTG9hZEJhbGFuY2VyQWNj",
+            "dW11bGF0ZWRTdGF0c1JlcXVlc3QaMi5ncnBjLnRlc3RpbmcuTG9hZEJhbGFu",
+            "Y2VyQWNjdW11bGF0ZWRTdGF0c1Jlc3BvbnNlIgAyiwEKFlhkc1VwZGF0ZUhl",
+            "YWx0aFNlcnZpY2USNgoKU2V0U2VydmluZxITLmdycGMudGVzdGluZy5FbXB0",
+            "eRoTLmdycGMudGVzdGluZy5FbXB0eRI5Cg1TZXROb3RTZXJ2aW5nEhMuZ3Jw",
+            "Yy50ZXN0aW5nLkVtcHR5GhMuZ3JwYy50ZXN0aW5nLkVtcHR5MnsKH1hkc1Vw",
+            "ZGF0ZUNsaWVudENvbmZpZ3VyZVNlcnZpY2USWAoJQ29uZmlndXJlEiQuZ3Jw",
+            "Yy50ZXN0aW5nLkNsaWVudENvbmZpZ3VyZVJlcXVlc3QaJS5ncnBjLnRlc3Rp",
+            "bmcuQ2xpZW50Q29uZmlndXJlUmVzcG9uc2ViBnByb3RvMw=="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { global::Grpc.Testing.EmptyReflection.Descriptor, global::Grpc.Testing.MessagesReflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(null, null, null));
diff --git a/src/csharp/Grpc.IntegrationTesting/TestGrpc.cs b/src/csharp/Grpc.IntegrationTesting/TestGrpc.cs
index 168c0892bae8d..8c1e0123879f8 100644
--- a/src/csharp/Grpc.IntegrationTesting/TestGrpc.cs
+++ b/src/csharp/Grpc.IntegrationTesting/TestGrpc.cs
@@ -947,6 +947,8 @@ static class __Helper_MessageCache<T>
 
     static readonly grpc::Marshaller<global::Grpc.Testing.LoadBalancerStatsRequest> __Marshaller_grpc_testing_LoadBalancerStatsRequest = grpc::Marshallers.Create(__Helper_SerializeMessage, context => __Helper_DeserializeMessage(context, global::Grpc.Testing.LoadBalancerStatsRequest.Parser));
     static readonly grpc::Marshaller<global::Grpc.Testing.LoadBalancerStatsResponse> __Marshaller_grpc_testing_LoadBalancerStatsResponse = grpc::Marshallers.Create(__Helper_SerializeMessage, context => __Helper_DeserializeMessage(context, global::Grpc.Testing.LoadBalancerStatsResponse.Parser));
+    static readonly grpc::Marshaller<global::Grpc.Testing.LoadBalancerAccumulatedStatsRequest> __Marshaller_grpc_testing_LoadBalancerAccumulatedStatsRequest = grpc::Marshallers.Create(__Helper_SerializeMessage, context => __Helper_DeserializeMessage(context, global::Grpc.Testing.LoadBalancerAccumulatedStatsRequest.Parser));
+    static readonly grpc::Marshaller<global::Grpc.Testing.LoadBalancerAccumulatedStatsResponse> __Marshaller_grpc_testing_LoadBalancerAccumulatedStatsResponse = grpc::Marshallers.Create(__Helper_SerializeMessage, context => __Helper_DeserializeMessage(context, global::Grpc.Testing.LoadBalancerAccumulatedStatsResponse.Parser));
 
     static readonly grpc::Method<global::Grpc.Testing.LoadBalancerStatsRequest, global::Grpc.Testing.LoadBalancerStatsResponse> __Method_GetClientStats = new grpc::Method<global::Grpc.Testing.LoadBalancerStatsRequest, global::Grpc.Testing.LoadBalancerStatsResponse>(
         grpc::MethodType.Unary,
@@ -955,6 +957,13 @@ static class __Helper_MessageCache<T>
         __Marshaller_grpc_testing_LoadBalancerStatsRequest,
         __Marshaller_grpc_testing_LoadBalancerStatsResponse);
 
+    static readonly grpc::Method<global::Grpc.Testing.LoadBalancerAccumulatedStatsRequest, global::Grpc.Testing.LoadBalancerAccumulatedStatsResponse> __Method_GetClientAccumulatedStats = new grpc::Method<global::Grpc.Testing.LoadBalancerAccumulatedStatsRequest, global::Grpc.Testing.LoadBalancerAccumulatedStatsResponse>(
+        grpc::MethodType.Unary,
+        __ServiceName,
+        "GetClientAccumulatedStats",
+        __Marshaller_grpc_testing_LoadBalancerAccumulatedStatsRequest,
+        __Marshaller_grpc_testing_LoadBalancerAccumulatedStatsResponse);
+
     /// <summary>Service descriptor</summary>
     public static global::Google.Protobuf.Reflection.ServiceDescriptor Descriptor
     {
@@ -976,6 +985,17 @@ public abstract partial class LoadBalancerStatsServiceBase
         throw new grpc::RpcException(new grpc::Status(grpc::StatusCode.Unimplemented, ""));
       }
 
+      /// <summary>
+      /// Gets the accumulated stats for RPCs sent by a test client.
+      /// </summary>
+      /// <param name="request">The request received from the client.</param>
+      /// <param name="context">The context of the server-side call handler being invoked.</param>
+      /// <returns>The response to send back to the client (wrapped by a task).</returns>
+      public virtual global::System.Threading.Tasks.Task<global::Grpc.Testing.LoadBalancerAccumulatedStatsResponse> GetClientAccumulatedStats(global::Grpc.Testing.LoadBalancerAccumulatedStatsRequest request, grpc::ServerCallContext context)
+      {
+        throw new grpc::RpcException(new grpc::Status(grpc::StatusCode.Unimplemented, ""));
+      }
+
     }
 
     /// <summary>Client for LoadBalancerStatsService</summary>
@@ -1045,6 +1065,50 @@ protected LoadBalancerStatsServiceClient(ClientBaseConfiguration configuration)
       {
         return CallInvoker.AsyncUnaryCall(__Method_GetClientStats, null, options, request);
       }
+      /// <summary>
+      /// Gets the accumulated stats for RPCs sent by a test client.
+      /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="headers">The initial metadata to send with the call. This parameter is optional.</param>
+      /// <param name="deadline">An optional deadline for the call. The call will be cancelled if deadline is hit.</param>
+      /// <param name="cancellationToken">An optional token for canceling the call.</param>
+      /// <returns>The response received from the server.</returns>
+      public virtual global::Grpc.Testing.LoadBalancerAccumulatedStatsResponse GetClientAccumulatedStats(global::Grpc.Testing.LoadBalancerAccumulatedStatsRequest request, grpc::Metadata headers = null, global::System.DateTime? deadline = null, global::System.Threading.CancellationToken cancellationToken = default(global::System.Threading.CancellationToken))
+      {
+        return GetClientAccumulatedStats(request, new grpc::CallOptions(headers, deadline, cancellationToken));
+      }
+      /// <summary>
+      /// Gets the accumulated stats for RPCs sent by a test client.
+      /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="options">The options for the call.</param>
+      /// <returns>The response received from the server.</returns>
+      public virtual global::Grpc.Testing.LoadBalancerAccumulatedStatsResponse GetClientAccumulatedStats(global::Grpc.Testing.LoadBalancerAccumulatedStatsRequest request, grpc::CallOptions options)
+      {
+        return CallInvoker.BlockingUnaryCall(__Method_GetClientAccumulatedStats, null, options, request);
+      }
+      /// <summary>
+      /// Gets the accumulated stats for RPCs sent by a test client.
+      /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="headers">The initial metadata to send with the call. This parameter is optional.</param>
+      /// <param name="deadline">An optional deadline for the call. The call will be cancelled if deadline is hit.</param>
+      /// <param name="cancellationToken">An optional token for canceling the call.</param>
+      /// <returns>The call object.</returns>
+      public virtual grpc::AsyncUnaryCall<global::Grpc.Testing.LoadBalancerAccumulatedStatsResponse> GetClientAccumulatedStatsAsync(global::Grpc.Testing.LoadBalancerAccumulatedStatsRequest request, grpc::Metadata headers = null, global::System.DateTime? deadline = null, global::System.Threading.CancellationToken cancellationToken = default(global::System.Threading.CancellationToken))
+      {
+        return GetClientAccumulatedStatsAsync(request, new grpc::CallOptions(headers, deadline, cancellationToken));
+      }
+      /// <summary>
+      /// Gets the accumulated stats for RPCs sent by a test client.
+      /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="options">The options for the call.</param>
+      /// <returns>The call object.</returns>
+      public virtual grpc::AsyncUnaryCall<global::Grpc.Testing.LoadBalancerAccumulatedStatsResponse> GetClientAccumulatedStatsAsync(global::Grpc.Testing.LoadBalancerAccumulatedStatsRequest request, grpc::CallOptions options)
+      {
+        return CallInvoker.AsyncUnaryCall(__Method_GetClientAccumulatedStats, null, options, request);
+      }
       /// <summary>Creates a new instance of client from given <c>ClientBaseConfiguration</c>.</summary>
       protected override LoadBalancerStatsServiceClient NewInstance(ClientBaseConfiguration configuration)
       {
@@ -1057,7 +1121,8 @@ protected override LoadBalancerStatsServiceClient NewInstance(ClientBaseConfigur
     public static grpc::ServerServiceDefinition BindService(LoadBalancerStatsServiceBase serviceImpl)
     {
       return grpc::ServerServiceDefinition.CreateBuilder()
-          .AddMethod(__Method_GetClientStats, serviceImpl.GetClientStats).Build();
+          .AddMethod(__Method_GetClientStats, serviceImpl.GetClientStats)
+          .AddMethod(__Method_GetClientAccumulatedStats, serviceImpl.GetClientAccumulatedStats).Build();
     }
 
     /// <summary>Register service method with a service binder with or without implementation. Useful when customizing the  service binding logic.
@@ -1067,6 +1132,7 @@ protected override LoadBalancerStatsServiceClient NewInstance(ClientBaseConfigur
     public static void BindService(grpc::ServiceBinderBase serviceBinder, LoadBalancerStatsServiceBase serviceImpl)
     {
       serviceBinder.AddMethod(__Method_GetClientStats, serviceImpl == null ? null : new grpc::UnaryServerMethod<global::Grpc.Testing.LoadBalancerStatsRequest, global::Grpc.Testing.LoadBalancerStatsResponse>(serviceImpl.GetClientStats));
+      serviceBinder.AddMethod(__Method_GetClientAccumulatedStats, serviceImpl == null ? null : new grpc::UnaryServerMethod<global::Grpc.Testing.LoadBalancerAccumulatedStatsRequest, global::Grpc.Testing.LoadBalancerAccumulatedStatsResponse>(serviceImpl.GetClientAccumulatedStats));
     }
 
   }
@@ -1227,5 +1293,167 @@ public static void BindService(grpc::ServiceBinderBase serviceBinder, XdsUpdateH
     }
 
   }
+  /// <summary>
+  /// A service to dynamically update the configuration of an xDS test client.
+  /// </summary>
+  public static partial class XdsUpdateClientConfigureService
+  {
+    static readonly string __ServiceName = "grpc.testing.XdsUpdateClientConfigureService";
+
+    static void __Helper_SerializeMessage(global::Google.Protobuf.IMessage message, grpc::SerializationContext context)
+    {
+      #if !GRPC_DISABLE_PROTOBUF_BUFFER_SERIALIZATION
+      if (message is global::Google.Protobuf.IBufferMessage)
+      {
+        context.SetPayloadLength(message.CalculateSize());
+        global::Google.Protobuf.MessageExtensions.WriteTo(message, context.GetBufferWriter());
+        context.Complete();
+        return;
+      }
+      #endif
+      context.Complete(global::Google.Protobuf.MessageExtensions.ToByteArray(message));
+    }
+
+    static class __Helper_MessageCache<T>
+    {
+      public static readonly bool IsBufferMessage = global::System.Reflection.IntrospectionExtensions.GetTypeInfo(typeof(global::Google.Protobuf.IBufferMessage)).IsAssignableFrom(typeof(T));
+    }
+
+    static T __Helper_DeserializeMessage<T>(grpc::DeserializationContext context, global::Google.Protobuf.MessageParser<T> parser) where T : global::Google.Protobuf.IMessage<T>
+    {
+      #if !GRPC_DISABLE_PROTOBUF_BUFFER_SERIALIZATION
+      if (__Helper_MessageCache<T>.IsBufferMessage)
+      {
+        return parser.ParseFrom(context.PayloadAsReadOnlySequence());
+      }
+      #endif
+      return parser.ParseFrom(context.PayloadAsNewBuffer());
+    }
+
+    static readonly grpc::Marshaller<global::Grpc.Testing.ClientConfigureRequest> __Marshaller_grpc_testing_ClientConfigureRequest = grpc::Marshallers.Create(__Helper_SerializeMessage, context => __Helper_DeserializeMessage(context, global::Grpc.Testing.ClientConfigureRequest.Parser));
+    static readonly grpc::Marshaller<global::Grpc.Testing.ClientConfigureResponse> __Marshaller_grpc_testing_ClientConfigureResponse = grpc::Marshallers.Create(__Helper_SerializeMessage, context => __Helper_DeserializeMessage(context, global::Grpc.Testing.ClientConfigureResponse.Parser));
+
+    static readonly grpc::Method<global::Grpc.Testing.ClientConfigureRequest, global::Grpc.Testing.ClientConfigureResponse> __Method_Configure = new grpc::Method<global::Grpc.Testing.ClientConfigureRequest, global::Grpc.Testing.ClientConfigureResponse>(
+        grpc::MethodType.Unary,
+        __ServiceName,
+        "Configure",
+        __Marshaller_grpc_testing_ClientConfigureRequest,
+        __Marshaller_grpc_testing_ClientConfigureResponse);
+
+    /// <summary>Service descriptor</summary>
+    public static global::Google.Protobuf.Reflection.ServiceDescriptor Descriptor
+    {
+      get { return global::Grpc.Testing.TestReflection.Descriptor.Services[5]; }
+    }
+
+    /// <summary>Base class for server-side implementations of XdsUpdateClientConfigureService</summary>
+    [grpc::BindServiceMethod(typeof(XdsUpdateClientConfigureService), "BindService")]
+    public abstract partial class XdsUpdateClientConfigureServiceBase
+    {
+      /// <summary>
+      /// Update the tes client's configuration.
+      /// </summary>
+      /// <param name="request">The request received from the client.</param>
+      /// <param name="context">The context of the server-side call handler being invoked.</param>
+      /// <returns>The response to send back to the client (wrapped by a task).</returns>
+      public virtual global::System.Threading.Tasks.Task<global::Grpc.Testing.ClientConfigureResponse> Configure(global::Grpc.Testing.ClientConfigureRequest request, grpc::ServerCallContext context)
+      {
+        throw new grpc::RpcException(new grpc::Status(grpc::StatusCode.Unimplemented, ""));
+      }
+
+    }
+
+    /// <summary>Client for XdsUpdateClientConfigureService</summary>
+    public partial class XdsUpdateClientConfigureServiceClient : grpc::ClientBase<XdsUpdateClientConfigureServiceClient>
+    {
+      /// <summary>Creates a new client for XdsUpdateClientConfigureService</summary>
+      /// <param name="channel">The channel to use to make remote calls.</param>
+      public XdsUpdateClientConfigureServiceClient(grpc::ChannelBase channel) : base(channel)
+      {
+      }
+      /// <summary>Creates a new client for XdsUpdateClientConfigureService that uses a custom <c>CallInvoker</c>.</summary>
+      /// <param name="callInvoker">The callInvoker to use to make remote calls.</param>
+      public XdsUpdateClientConfigureServiceClient(grpc::CallInvoker callInvoker) : base(callInvoker)
+      {
+      }
+      /// <summary>Protected parameterless constructor to allow creation of test doubles.</summary>
+      protected XdsUpdateClientConfigureServiceClient() : base()
+      {
+      }
+      /// <summary>Protected constructor to allow creation of configured clients.</summary>
+      /// <param name="configuration">The client configuration.</param>
+      protected XdsUpdateClientConfigureServiceClient(ClientBaseConfiguration configuration) : base(configuration)
+      {
+      }
+
+      /// <summary>
+      /// Update the tes client's configuration.
+      /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="headers">The initial metadata to send with the call. This parameter is optional.</param>
+      /// <param name="deadline">An optional deadline for the call. The call will be cancelled if deadline is hit.</param>
+      /// <param name="cancellationToken">An optional token for canceling the call.</param>
+      /// <returns>The response received from the server.</returns>
+      public virtual global::Grpc.Testing.ClientConfigureResponse Configure(global::Grpc.Testing.ClientConfigureRequest request, grpc::Metadata headers = null, global::System.DateTime? deadline = null, global::System.Threading.CancellationToken cancellationToken = default(global::System.Threading.CancellationToken))
+      {
+        return Configure(request, new grpc::CallOptions(headers, deadline, cancellationToken));
+      }
+      /// <summary>
+      /// Update the tes client's configuration.
+      /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="options">The options for the call.</param>
+      /// <returns>The response received from the server.</returns>
+      public virtual global::Grpc.Testing.ClientConfigureResponse Configure(global::Grpc.Testing.ClientConfigureRequest request, grpc::CallOptions options)
+      {
+        return CallInvoker.BlockingUnaryCall(__Method_Configure, null, options, request);
+      }
+      /// <summary>
+      /// Update the tes client's configuration.
+      /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="headers">The initial metadata to send with the call. This parameter is optional.</param>
+      /// <param name="deadline">An optional deadline for the call. The call will be cancelled if deadline is hit.</param>
+      /// <param name="cancellationToken">An optional token for canceling the call.</param>
+      /// <returns>The call object.</returns>
+      public virtual grpc::AsyncUnaryCall<global::Grpc.Testing.ClientConfigureResponse> ConfigureAsync(global::Grpc.Testing.ClientConfigureRequest request, grpc::Metadata headers = null, global::System.DateTime? deadline = null, global::System.Threading.CancellationToken cancellationToken = default(global::System.Threading.CancellationToken))
+      {
+        return ConfigureAsync(request, new grpc::CallOptions(headers, deadline, cancellationToken));
+      }
+      /// <summary>
+      /// Update the tes client's configuration.
+      /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="options">The options for the call.</param>
+      /// <returns>The call object.</returns>
+      public virtual grpc::AsyncUnaryCall<global::Grpc.Testing.ClientConfigureResponse> ConfigureAsync(global::Grpc.Testing.ClientConfigureRequest request, grpc::CallOptions options)
+      {
+        return CallInvoker.AsyncUnaryCall(__Method_Configure, null, options, request);
+      }
+      /// <summary>Creates a new instance of client from given <c>ClientBaseConfiguration</c>.</summary>
+      protected override XdsUpdateClientConfigureServiceClient NewInstance(ClientBaseConfiguration configuration)
+      {
+        return new XdsUpdateClientConfigureServiceClient(configuration);
+      }
+    }
+
+    /// <summary>Creates service definition that can be registered with a server</summary>
+    /// <param name="serviceImpl">An object implementing the server-side handling logic.</param>
+    public static grpc::ServerServiceDefinition BindService(XdsUpdateClientConfigureServiceBase serviceImpl)
+    {
+      return grpc::ServerServiceDefinition.CreateBuilder()
+          .AddMethod(__Method_Configure, serviceImpl.Configure).Build();
+    }
+
+    /// <summary>Register service method with a service binder with or without implementation. Useful when customizing the  service binding logic.
+    /// Note: this method is part of an experimental API that can change or be removed without any prior notice.</summary>
+    /// <param name="serviceBinder">Service methods will be bound by calling <c>AddMethod</c> on this object.</param>
+    /// <param name="serviceImpl">An object implementing the server-side handling logic.</param>
+    public static void BindService(grpc::ServiceBinderBase serviceBinder, XdsUpdateClientConfigureServiceBase serviceImpl)
+    {
+      serviceBinder.AddMethod(__Method_Configure, serviceImpl == null ? null : new grpc::UnaryServerMethod<global::Grpc.Testing.ClientConfigureRequest, global::Grpc.Testing.ClientConfigureResponse>(serviceImpl.Configure));
+    }
+
+  }
 }
 #endregion
diff --git a/src/csharp/build/dependencies.props b/src/csharp/build/dependencies.props
index 889ecf4b4bedd..8383cd522307f 100644
--- a/src/csharp/build/dependencies.props
+++ b/src/csharp/build/dependencies.props
@@ -2,6 +2,6 @@
 <Project>
   <PropertyGroup>
     <GrpcCsharpVersion>2.34.0-dev</GrpcCsharpVersion>
-    <GoogleProtobufVersion>3.13.0</GoogleProtobufVersion>
+    <GoogleProtobufVersion>3.14.0-rc2</GoogleProtobufVersion>
   </PropertyGroup>
 </Project>
diff --git a/src/ruby/pb/src/proto/grpc/testing/messages_pb.rb b/src/ruby/pb/src/proto/grpc/testing/messages_pb.rb
index d902ae0e7369b..3a44783291ccd 100644
--- a/src/ruby/pb/src/proto/grpc/testing/messages_pb.rb
+++ b/src/ruby/pb/src/proto/grpc/testing/messages_pb.rb
@@ -76,6 +76,28 @@
     add_message "grpc.testing.LoadBalancerStatsResponse.RpcsByPeer" do
       map :rpcs_by_peer, :string, :int32, 1
     end
+    add_message "grpc.testing.LoadBalancerAccumulatedStatsRequest" do
+    end
+    add_message "grpc.testing.LoadBalancerAccumulatedStatsResponse" do
+      map :num_rpcs_started_by_method, :string, :int32, 1
+      map :num_rpcs_succeeded_by_method, :string, :int32, 2
+      map :num_rpcs_failed_by_method, :string, :int32, 3
+    end
+    add_message "grpc.testing.ClientConfigureRequest" do
+      repeated :types, :enum, 1, "grpc.testing.ClientConfigureRequest.RpcType"
+      repeated :metadata, :message, 2, "grpc.testing.ClientConfigureRequest.Metadata"
+    end
+    add_message "grpc.testing.ClientConfigureRequest.Metadata" do
+      optional :type, :enum, 1, "grpc.testing.ClientConfigureRequest.RpcType"
+      optional :key, :string, 2
+      optional :value, :string, 3
+    end
+    add_enum "grpc.testing.ClientConfigureRequest.RpcType" do
+      value :EMPTY_CALL, 0
+      value :UNARY_CALL, 1
+    end
+    add_message "grpc.testing.ClientConfigureResponse" do
+    end
     add_enum "grpc.testing.PayloadType" do
       value :COMPRESSABLE, 0
     end
@@ -104,6 +126,12 @@ module Testing
     LoadBalancerStatsRequest = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.LoadBalancerStatsRequest").msgclass
     LoadBalancerStatsResponse = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.LoadBalancerStatsResponse").msgclass
     LoadBalancerStatsResponse::RpcsByPeer = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.LoadBalancerStatsResponse.RpcsByPeer").msgclass
+    LoadBalancerAccumulatedStatsRequest = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.LoadBalancerAccumulatedStatsRequest").msgclass
+    LoadBalancerAccumulatedStatsResponse = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.LoadBalancerAccumulatedStatsResponse").msgclass
+    ClientConfigureRequest = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.ClientConfigureRequest").msgclass
+    ClientConfigureRequest::Metadata = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.ClientConfigureRequest.Metadata").msgclass
+    ClientConfigureRequest::RpcType = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.ClientConfigureRequest.RpcType").enummodule
+    ClientConfigureResponse = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.ClientConfigureResponse").msgclass
     PayloadType = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.PayloadType").enummodule
     GrpclbRouteType = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.GrpclbRouteType").enummodule
   end
diff --git a/src/ruby/pb/src/proto/grpc/testing/test_services_pb.rb b/src/ruby/pb/src/proto/grpc/testing/test_services_pb.rb
index 115acd0dcae48..19e6df7c72414 100644
--- a/src/ruby/pb/src/proto/grpc/testing/test_services_pb.rb
+++ b/src/ruby/pb/src/proto/grpc/testing/test_services_pb.rb
@@ -110,6 +110,8 @@ class Service
 
         # Gets the backend distribution for RPCs sent by a test client.
         rpc :GetClientStats, ::Grpc::Testing::LoadBalancerStatsRequest, ::Grpc::Testing::LoadBalancerStatsResponse
+        # Gets the accumulated stats for RPCs sent by a test client.
+        rpc :GetClientAccumulatedStats, ::Grpc::Testing::LoadBalancerAccumulatedStatsRequest, ::Grpc::Testing::LoadBalancerAccumulatedStatsResponse
       end
 
       Stub = Service.rpc_stub_class
@@ -128,6 +130,22 @@ class Service
         rpc :SetNotServing, ::Grpc::Testing::Empty, ::Grpc::Testing::Empty
       end
 
+      Stub = Service.rpc_stub_class
+    end
+    module XdsUpdateClientConfigureService
+      # A service to dynamically update the configuration of an xDS test client.
+      class Service
+
+        include GRPC::GenericService
+
+        self.marshal_class_method = :encode
+        self.unmarshal_class_method = :decode
+        self.service_name = 'grpc.testing.XdsUpdateClientConfigureService'
+
+        # Update the tes client's configuration.
+        rpc :Configure, ::Grpc::Testing::ClientConfigureRequest, ::Grpc::Testing::ClientConfigureResponse
+      end
+
       Stub = Service.rpc_stub_class
     end
   end
diff --git a/src/ruby/qps/src/proto/grpc/testing/messages_pb.rb b/src/ruby/qps/src/proto/grpc/testing/messages_pb.rb
index d902ae0e7369b..3a44783291ccd 100644
--- a/src/ruby/qps/src/proto/grpc/testing/messages_pb.rb
+++ b/src/ruby/qps/src/proto/grpc/testing/messages_pb.rb
@@ -76,6 +76,28 @@
     add_message "grpc.testing.LoadBalancerStatsResponse.RpcsByPeer" do
       map :rpcs_by_peer, :string, :int32, 1
     end
+    add_message "grpc.testing.LoadBalancerAccumulatedStatsRequest" do
+    end
+    add_message "grpc.testing.LoadBalancerAccumulatedStatsResponse" do
+      map :num_rpcs_started_by_method, :string, :int32, 1
+      map :num_rpcs_succeeded_by_method, :string, :int32, 2
+      map :num_rpcs_failed_by_method, :string, :int32, 3
+    end
+    add_message "grpc.testing.ClientConfigureRequest" do
+      repeated :types, :enum, 1, "grpc.testing.ClientConfigureRequest.RpcType"
+      repeated :metadata, :message, 2, "grpc.testing.ClientConfigureRequest.Metadata"
+    end
+    add_message "grpc.testing.ClientConfigureRequest.Metadata" do
+      optional :type, :enum, 1, "grpc.testing.ClientConfigureRequest.RpcType"
+      optional :key, :string, 2
+      optional :value, :string, 3
+    end
+    add_enum "grpc.testing.ClientConfigureRequest.RpcType" do
+      value :EMPTY_CALL, 0
+      value :UNARY_CALL, 1
+    end
+    add_message "grpc.testing.ClientConfigureResponse" do
+    end
     add_enum "grpc.testing.PayloadType" do
       value :COMPRESSABLE, 0
     end
@@ -104,6 +126,12 @@ module Testing
     LoadBalancerStatsRequest = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.LoadBalancerStatsRequest").msgclass
     LoadBalancerStatsResponse = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.LoadBalancerStatsResponse").msgclass
     LoadBalancerStatsResponse::RpcsByPeer = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.LoadBalancerStatsResponse.RpcsByPeer").msgclass
+    LoadBalancerAccumulatedStatsRequest = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.LoadBalancerAccumulatedStatsRequest").msgclass
+    LoadBalancerAccumulatedStatsResponse = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.LoadBalancerAccumulatedStatsResponse").msgclass
+    ClientConfigureRequest = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.ClientConfigureRequest").msgclass
+    ClientConfigureRequest::Metadata = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.ClientConfigureRequest.Metadata").msgclass
+    ClientConfigureRequest::RpcType = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.ClientConfigureRequest.RpcType").enummodule
+    ClientConfigureResponse = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.ClientConfigureResponse").msgclass
     PayloadType = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.PayloadType").enummodule
     GrpclbRouteType = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("grpc.testing.GrpclbRouteType").enummodule
   end
diff --git a/templates/grpc.gemspec.template b/templates/grpc.gemspec.template
index c9a5cc7840d99..6b200a66c98a4 100644
--- a/templates/grpc.gemspec.template
+++ b/templates/grpc.gemspec.template
@@ -34,7 +34,7 @@
     s.require_paths = %w( src/ruby/lib src/ruby/bin src/ruby/pb )
     s.platform      = Gem::Platform::RUBY
 
-    s.add_dependency 'google-protobuf', '~> 3.13'
+    s.add_dependency 'google-protobuf', '~> 3.14.0.rc.1'
     s.add_dependency 'googleapis-common-protos-types', '~> 1.0'
 
     s.add_development_dependency 'bundler',            '>= 1.9'
diff --git a/templates/src/csharp/build/dependencies.props.template b/templates/src/csharp/build/dependencies.props.template
index 8c21a9ff54140..7896ad0257d97 100755
--- a/templates/src/csharp/build/dependencies.props.template
+++ b/templates/src/csharp/build/dependencies.props.template
@@ -4,6 +4,6 @@
   <Project>
     <PropertyGroup>
       <GrpcCsharpVersion>${settings.csharp_version}</GrpcCsharpVersion>
-      <GoogleProtobufVersion>3.13.0</GoogleProtobufVersion>
+    <GoogleProtobufVersion>3.14.0-rc2</GoogleProtobufVersion>
     </PropertyGroup>
   </Project>
diff --git a/third_party/protobuf b/third_party/protobuf
index fde7cf7358ec7..fbbe11ae493e1 160000
--- a/third_party/protobuf
+++ b/third_party/protobuf
@@ -1 +1 @@
-Subproject commit fde7cf7358ec7cd69e8db9be4f1fa6a5c431386a
+Subproject commit fbbe11ae493e1e1bab6cc396dfbb7b4de9fd8bd0
diff --git a/tools/distrib/python/grpcio_tools/protoc_lib_deps.py b/tools/distrib/python/grpcio_tools/protoc_lib_deps.py
index f9c3cab273769..474bee608cbac 100644
--- a/tools/distrib/python/grpcio_tools/protoc_lib_deps.py
+++ b/tools/distrib/python/grpcio_tools/protoc_lib_deps.py
@@ -14,10 +14,10 @@
 # limitations under the License.
 
 # AUTO-GENERATED BY make_grpcio_tools.py!
-CC_FILES=['google/protobuf/compiler/zip_writer.cc', 'google/protobuf/compiler/subprocess.cc', 'google/protobuf/compiler/ruby/ruby_generator.cc', 'google/protobuf/compiler/python/python_generator.cc', 'google/protobuf/compiler/plugin.pb.cc', 'google/protobuf/compiler/plugin.cc', 'google/protobuf/compiler/php/php_generator.cc', 'google/protobuf/compiler/objectivec/objectivec_primitive_field.cc', 'google/protobuf/compiler/objectivec/objectivec_oneof.cc', 'google/protobuf/compiler/objectivec/objectivec_message_field.cc', 'google/protobuf/compiler/objectivec/objectivec_message.cc', 'google/protobuf/compiler/objectivec/objectivec_map_field.cc', 'google/protobuf/compiler/objectivec/objectivec_helpers.cc', 'google/protobuf/compiler/objectivec/objectivec_generator.cc', 'google/protobuf/compiler/objectivec/objectivec_file.cc', 'google/protobuf/compiler/objectivec/objectivec_field.cc', 'google/protobuf/compiler/objectivec/objectivec_extension.cc', 'google/protobuf/compiler/objectivec/objectivec_enum_field.cc', 'google/protobuf/compiler/objectivec/objectivec_enum.cc', 'google/protobuf/compiler/js/well_known_types_embed.cc', 'google/protobuf/compiler/js/js_generator.cc', 'google/protobuf/compiler/java/java_string_field_lite.cc', 'google/protobuf/compiler/java/java_string_field.cc', 'google/protobuf/compiler/java/java_shared_code_generator.cc', 'google/protobuf/compiler/java/java_service.cc', 'google/protobuf/compiler/java/java_primitive_field_lite.cc', 'google/protobuf/compiler/java/java_primitive_field.cc', 'google/protobuf/compiler/java/java_name_resolver.cc', 'google/protobuf/compiler/java/java_message_lite.cc', 'google/protobuf/compiler/java/java_message_field_lite.cc', 'google/protobuf/compiler/java/java_message_field.cc', 'google/protobuf/compiler/java/java_message_builder_lite.cc', 'google/protobuf/compiler/java/java_message_builder.cc', 'google/protobuf/compiler/java/java_message.cc', 'google/protobuf/compiler/java/java_map_field_lite.cc', 'google/protobuf/compiler/java/java_map_field.cc', 'google/protobuf/compiler/java/java_helpers.cc', 'google/protobuf/compiler/java/java_generator_factory.cc', 'google/protobuf/compiler/java/java_generator.cc', 'google/protobuf/compiler/java/java_file.cc', 'google/protobuf/compiler/java/java_field.cc', 'google/protobuf/compiler/java/java_extension_lite.cc', 'google/protobuf/compiler/java/java_extension.cc', 'google/protobuf/compiler/java/java_enum_lite.cc', 'google/protobuf/compiler/java/java_enum_field_lite.cc', 'google/protobuf/compiler/java/java_enum_field.cc', 'google/protobuf/compiler/java/java_enum.cc', 'google/protobuf/compiler/java/java_doc_comment.cc', 'google/protobuf/compiler/java/java_context.cc', 'google/protobuf/compiler/csharp/csharp_wrapper_field.cc', 'google/protobuf/compiler/csharp/csharp_source_generator_base.cc', 'google/protobuf/compiler/csharp/csharp_repeated_primitive_field.cc', 'google/protobuf/compiler/csharp/csharp_repeated_message_field.cc', 'google/protobuf/compiler/csharp/csharp_repeated_enum_field.cc', 'google/protobuf/compiler/csharp/csharp_reflection_class.cc', 'google/protobuf/compiler/csharp/csharp_primitive_field.cc', 'google/protobuf/compiler/csharp/csharp_message_field.cc', 'google/protobuf/compiler/csharp/csharp_message.cc', 'google/protobuf/compiler/csharp/csharp_map_field.cc', 'google/protobuf/compiler/csharp/csharp_helpers.cc', 'google/protobuf/compiler/csharp/csharp_generator.cc', 'google/protobuf/compiler/csharp/csharp_field_base.cc', 'google/protobuf/compiler/csharp/csharp_enum_field.cc', 'google/protobuf/compiler/csharp/csharp_enum.cc', 'google/protobuf/compiler/csharp/csharp_doc_comment.cc', 'google/protobuf/compiler/cpp/cpp_string_field.cc', 'google/protobuf/compiler/cpp/cpp_service.cc', 'google/protobuf/compiler/cpp/cpp_primitive_field.cc', 'google/protobuf/compiler/cpp/cpp_padding_optimizer.cc', 'google/protobuf/compiler/cpp/cpp_message_field.cc', 'google/protobuf/compiler/cpp/cpp_message.cc', 'google/protobuf/compiler/cpp/cpp_map_field.cc', 'google/protobuf/compiler/cpp/cpp_helpers.cc', 'google/protobuf/compiler/cpp/cpp_generator.cc', 'google/protobuf/compiler/cpp/cpp_file.cc', 'google/protobuf/compiler/cpp/cpp_field.cc', 'google/protobuf/compiler/cpp/cpp_extension.cc', 'google/protobuf/compiler/cpp/cpp_enum_field.cc', 'google/protobuf/compiler/cpp/cpp_enum.cc', 'google/protobuf/compiler/command_line_interface.cc', 'google/protobuf/compiler/code_generator.cc', 'google/protobuf/wrappers.pb.cc', 'google/protobuf/wire_format.cc', 'google/protobuf/util/type_resolver_util.cc', 'google/protobuf/util/time_util.cc', 'google/protobuf/util/message_differencer.cc', 'google/protobuf/util/json_util.cc', 'google/protobuf/util/internal/utility.cc', 'google/protobuf/util/internal/type_info_test_helper.cc', 'google/protobuf/util/internal/type_info.cc', 'google/protobuf/util/internal/protostream_objectwriter.cc', 'google/protobuf/util/internal/protostream_objectsource.cc', 'google/protobuf/util/internal/proto_writer.cc', 'google/protobuf/util/internal/object_writer.cc', 'google/protobuf/util/internal/json_stream_parser.cc', 'google/protobuf/util/internal/json_objectwriter.cc', 'google/protobuf/util/internal/json_escaping.cc', 'google/protobuf/util/internal/field_mask_utility.cc', 'google/protobuf/util/internal/error_listener.cc', 'google/protobuf/util/internal/default_value_objectwriter.cc', 'google/protobuf/util/internal/datapiece.cc', 'google/protobuf/util/field_mask_util.cc', 'google/protobuf/util/field_comparator.cc', 'google/protobuf/util/delimited_message_util.cc', 'google/protobuf/unknown_field_set.cc', 'google/protobuf/type.pb.cc', 'google/protobuf/timestamp.pb.cc', 'google/protobuf/text_format.cc', 'google/protobuf/stubs/substitute.cc', 'google/protobuf/struct.pb.cc', 'google/protobuf/source_context.pb.cc', 'google/protobuf/service.cc', 'google/protobuf/reflection_ops.cc', 'google/protobuf/message.cc', 'google/protobuf/map_field.cc', 'google/protobuf/io/tokenizer.cc', 'google/protobuf/io/printer.cc', 'google/protobuf/io/gzip_stream.cc', 'google/protobuf/generated_message_table_driven.cc', 'google/protobuf/generated_message_reflection.cc', 'google/protobuf/field_mask.pb.cc', 'google/protobuf/extension_set_heavy.cc', 'google/protobuf/empty.pb.cc', 'google/protobuf/dynamic_message.cc', 'google/protobuf/duration.pb.cc', 'google/protobuf/descriptor_database.cc', 'google/protobuf/descriptor.pb.cc', 'google/protobuf/descriptor.cc', 'google/protobuf/compiler/parser.cc', 'google/protobuf/compiler/importer.cc', 'google/protobuf/api.pb.cc', 'google/protobuf/any.pb.cc', 'google/protobuf/any.cc', 'google/protobuf/wire_format_lite.cc', 'google/protobuf/stubs/time.cc', 'google/protobuf/stubs/strutil.cc', 'google/protobuf/stubs/structurally_valid.cc', 'google/protobuf/stubs/stringprintf.cc', 'google/protobuf/stubs/stringpiece.cc', 'google/protobuf/stubs/statusor.cc', 'google/protobuf/stubs/status.cc', 'google/protobuf/stubs/int128.cc', 'google/protobuf/stubs/common.cc', 'google/protobuf/stubs/bytestream.cc', 'google/protobuf/repeated_field.cc', 'google/protobuf/parse_context.cc', 'google/protobuf/message_lite.cc', 'google/protobuf/io/zero_copy_stream_impl_lite.cc', 'google/protobuf/io/zero_copy_stream_impl.cc', 'google/protobuf/io/zero_copy_stream.cc', 'google/protobuf/io/strtod.cc', 'google/protobuf/io/io_win32.cc', 'google/protobuf/io/coded_stream.cc', 'google/protobuf/implicit_weak_message.cc', 'google/protobuf/generated_message_util.cc', 'google/protobuf/generated_message_table_driven_lite.cc', 'google/protobuf/generated_enum_util.cc', 'google/protobuf/extension_set.cc', 'google/protobuf/arena.cc', 'google/protobuf/any_lite.cc']
+CC_FILES=['google/protobuf/compiler/zip_writer.cc', 'google/protobuf/compiler/subprocess.cc', 'google/protobuf/compiler/ruby/ruby_generator.cc', 'google/protobuf/compiler/python/python_generator.cc', 'google/protobuf/compiler/plugin.pb.cc', 'google/protobuf/compiler/plugin.cc', 'google/protobuf/compiler/php/php_generator.cc', 'google/protobuf/compiler/objectivec/objectivec_primitive_field.cc', 'google/protobuf/compiler/objectivec/objectivec_oneof.cc', 'google/protobuf/compiler/objectivec/objectivec_message_field.cc', 'google/protobuf/compiler/objectivec/objectivec_message.cc', 'google/protobuf/compiler/objectivec/objectivec_map_field.cc', 'google/protobuf/compiler/objectivec/objectivec_helpers.cc', 'google/protobuf/compiler/objectivec/objectivec_generator.cc', 'google/protobuf/compiler/objectivec/objectivec_file.cc', 'google/protobuf/compiler/objectivec/objectivec_field.cc', 'google/protobuf/compiler/objectivec/objectivec_extension.cc', 'google/protobuf/compiler/objectivec/objectivec_enum_field.cc', 'google/protobuf/compiler/objectivec/objectivec_enum.cc', 'google/protobuf/compiler/js/well_known_types_embed.cc', 'google/protobuf/compiler/js/js_generator.cc', 'google/protobuf/compiler/java/java_string_field_lite.cc', 'google/protobuf/compiler/java/java_string_field.cc', 'google/protobuf/compiler/java/java_shared_code_generator.cc', 'google/protobuf/compiler/java/java_service.cc', 'google/protobuf/compiler/java/java_primitive_field_lite.cc', 'google/protobuf/compiler/java/java_primitive_field.cc', 'google/protobuf/compiler/java/java_name_resolver.cc', 'google/protobuf/compiler/java/java_message_lite.cc', 'google/protobuf/compiler/java/java_message_field_lite.cc', 'google/protobuf/compiler/java/java_message_field.cc', 'google/protobuf/compiler/java/java_message_builder_lite.cc', 'google/protobuf/compiler/java/java_message_builder.cc', 'google/protobuf/compiler/java/java_message.cc', 'google/protobuf/compiler/java/java_map_field_lite.cc', 'google/protobuf/compiler/java/java_map_field.cc', 'google/protobuf/compiler/java/java_helpers.cc', 'google/protobuf/compiler/java/java_generator_factory.cc', 'google/protobuf/compiler/java/java_generator.cc', 'google/protobuf/compiler/java/java_file.cc', 'google/protobuf/compiler/java/java_field.cc', 'google/protobuf/compiler/java/java_extension_lite.cc', 'google/protobuf/compiler/java/java_extension.cc', 'google/protobuf/compiler/java/java_enum_lite.cc', 'google/protobuf/compiler/java/java_enum_field_lite.cc', 'google/protobuf/compiler/java/java_enum_field.cc', 'google/protobuf/compiler/java/java_enum.cc', 'google/protobuf/compiler/java/java_doc_comment.cc', 'google/protobuf/compiler/java/java_context.cc', 'google/protobuf/compiler/csharp/csharp_wrapper_field.cc', 'google/protobuf/compiler/csharp/csharp_source_generator_base.cc', 'google/protobuf/compiler/csharp/csharp_repeated_primitive_field.cc', 'google/protobuf/compiler/csharp/csharp_repeated_message_field.cc', 'google/protobuf/compiler/csharp/csharp_repeated_enum_field.cc', 'google/protobuf/compiler/csharp/csharp_reflection_class.cc', 'google/protobuf/compiler/csharp/csharp_primitive_field.cc', 'google/protobuf/compiler/csharp/csharp_message_field.cc', 'google/protobuf/compiler/csharp/csharp_message.cc', 'google/protobuf/compiler/csharp/csharp_map_field.cc', 'google/protobuf/compiler/csharp/csharp_helpers.cc', 'google/protobuf/compiler/csharp/csharp_generator.cc', 'google/protobuf/compiler/csharp/csharp_field_base.cc', 'google/protobuf/compiler/csharp/csharp_enum_field.cc', 'google/protobuf/compiler/csharp/csharp_enum.cc', 'google/protobuf/compiler/csharp/csharp_doc_comment.cc', 'google/protobuf/compiler/cpp/cpp_string_field.cc', 'google/protobuf/compiler/cpp/cpp_service.cc', 'google/protobuf/compiler/cpp/cpp_primitive_field.cc', 'google/protobuf/compiler/cpp/cpp_padding_optimizer.cc', 'google/protobuf/compiler/cpp/cpp_message_field.cc', 'google/protobuf/compiler/cpp/cpp_message.cc', 'google/protobuf/compiler/cpp/cpp_map_field.cc', 'google/protobuf/compiler/cpp/cpp_helpers.cc', 'google/protobuf/compiler/cpp/cpp_generator.cc', 'google/protobuf/compiler/cpp/cpp_file.cc', 'google/protobuf/compiler/cpp/cpp_field.cc', 'google/protobuf/compiler/cpp/cpp_extension.cc', 'google/protobuf/compiler/cpp/cpp_enum_field.cc', 'google/protobuf/compiler/cpp/cpp_enum.cc', 'google/protobuf/compiler/command_line_interface.cc', 'google/protobuf/compiler/code_generator.cc', 'google/protobuf/wrappers.pb.cc', 'google/protobuf/wire_format.cc', 'google/protobuf/util/type_resolver_util.cc', 'google/protobuf/util/time_util.cc', 'google/protobuf/util/message_differencer.cc', 'google/protobuf/util/json_util.cc', 'google/protobuf/util/internal/utility.cc', 'google/protobuf/util/internal/type_info_test_helper.cc', 'google/protobuf/util/internal/type_info.cc', 'google/protobuf/util/internal/protostream_objectwriter.cc', 'google/protobuf/util/internal/protostream_objectsource.cc', 'google/protobuf/util/internal/proto_writer.cc', 'google/protobuf/util/internal/object_writer.cc', 'google/protobuf/util/internal/json_stream_parser.cc', 'google/protobuf/util/internal/json_objectwriter.cc', 'google/protobuf/util/internal/json_escaping.cc', 'google/protobuf/util/internal/field_mask_utility.cc', 'google/protobuf/util/internal/error_listener.cc', 'google/protobuf/util/internal/default_value_objectwriter.cc', 'google/protobuf/util/internal/datapiece.cc', 'google/protobuf/util/field_mask_util.cc', 'google/protobuf/util/field_comparator.cc', 'google/protobuf/util/delimited_message_util.cc', 'google/protobuf/unknown_field_set.cc', 'google/protobuf/type.pb.cc', 'google/protobuf/timestamp.pb.cc', 'google/protobuf/text_format.cc', 'google/protobuf/stubs/substitute.cc', 'google/protobuf/struct.pb.cc', 'google/protobuf/source_context.pb.cc', 'google/protobuf/service.cc', 'google/protobuf/reflection_ops.cc', 'google/protobuf/message.cc', 'google/protobuf/map_field.cc', 'google/protobuf/io/tokenizer.cc', 'google/protobuf/io/printer.cc', 'google/protobuf/io/gzip_stream.cc', 'google/protobuf/generated_message_table_driven.cc', 'google/protobuf/generated_message_reflection.cc', 'google/protobuf/field_mask.pb.cc', 'google/protobuf/extension_set_heavy.cc', 'google/protobuf/empty.pb.cc', 'google/protobuf/dynamic_message.cc', 'google/protobuf/duration.pb.cc', 'google/protobuf/descriptor_database.cc', 'google/protobuf/descriptor.pb.cc', 'google/protobuf/descriptor.cc', 'google/protobuf/compiler/parser.cc', 'google/protobuf/compiler/importer.cc', 'google/protobuf/api.pb.cc', 'google/protobuf/any.pb.cc', 'google/protobuf/any.cc', 'google/protobuf/wire_format_lite.cc', 'google/protobuf/stubs/time.cc', 'google/protobuf/stubs/strutil.cc', 'google/protobuf/stubs/structurally_valid.cc', 'google/protobuf/stubs/stringprintf.cc', 'google/protobuf/stubs/stringpiece.cc', 'google/protobuf/stubs/statusor.cc', 'google/protobuf/stubs/status.cc', 'google/protobuf/stubs/int128.cc', 'google/protobuf/stubs/common.cc', 'google/protobuf/stubs/bytestream.cc', 'google/protobuf/repeated_field.cc', 'google/protobuf/parse_context.cc', 'google/protobuf/message_lite.cc', 'google/protobuf/map.cc', 'google/protobuf/io/zero_copy_stream_impl_lite.cc', 'google/protobuf/io/zero_copy_stream_impl.cc', 'google/protobuf/io/zero_copy_stream.cc', 'google/protobuf/io/strtod.cc', 'google/protobuf/io/io_win32.cc', 'google/protobuf/io/coded_stream.cc', 'google/protobuf/implicit_weak_message.cc', 'google/protobuf/generated_message_util.cc', 'google/protobuf/generated_message_table_driven_lite.cc', 'google/protobuf/generated_enum_util.cc', 'google/protobuf/extension_set.cc', 'google/protobuf/arenastring.cc', 'google/protobuf/arena.cc', 'google/protobuf/any_lite.cc']
 PROTO_FILES=['google/protobuf/wrappers.proto', 'google/protobuf/type.proto', 'google/protobuf/timestamp.proto', 'google/protobuf/struct.proto', 'google/protobuf/source_context.proto', 'google/protobuf/field_mask.proto', 'google/protobuf/empty.proto', 'google/protobuf/duration.proto', 'google/protobuf/descriptor.proto', 'google/protobuf/compiler/plugin.proto', 'google/protobuf/api.proto', 'google/protobuf/any.proto']
 
 CC_INCLUDE='third_party/protobuf/src'
 PROTO_INCLUDE='third_party/protobuf/src'
 
-PROTOBUF_SUBMODULE_VERSION="fde7cf7358ec7cd69e8db9be4f1fa6a5c431386a"
+PROTOBUF_SUBMODULE_VERSION="fbbe11ae493e1e1bab6cc396dfbb7b4de9fd8bd0"
diff --git a/tools/run_tests/sanity/check_submodules.sh b/tools/run_tests/sanity/check_submodules.sh
index cc603a4e6069d..87ac32945c3d7 100755
--- a/tools/run_tests/sanity/check_submodules.sh
+++ b/tools/run_tests/sanity/check_submodules.sh
@@ -36,7 +36,7 @@ cat << EOF | awk '{ print $1 }' | sort > "$want_submodules"
  80ed4d0bbf65d57cc267dfc63bd2584557f11f9b third_party/googleapis (common-protos-1_3_1-915-g80ed4d0bb)
  c9ccac7cb7345901884aabf5d1a786cfa6e2f397 third_party/googletest (6e2f397)
  15ae750151ac9341e5945eb38f8982d59fb99201 third_party/libuv (v1.34.0)
- fde7cf7358ec7cd69e8db9be4f1fa6a5c431386a third_party/protobuf (v3.7.0-rc.2-1277-gfde7cf735)
+ fbbe11ae493e1e1bab6cc396dfbb7b4de9fd8bd0 third_party/protobuf (v3.7.0-rc.2-1443-gfbbe11ae4)
  e020f3aef8ae6cb59f384bfbaaed72e71e88ccd6 third_party/protoc-gen-validate (v0.4.1)
  aecba11114cf1fac5497aeb844b6966106de3eb6 third_party/re2 (heads/master)
  1f710aca26a95876e64973a6d2a927a9f4b20ca4 third_party/udpa (heads/master)