diff --git a/go/blob.pb.go b/go/blob.pb.go
index 53dd1db2d4e151d6e2a03afeef89ff21228b01ce..6080661807044200982891fb9b7e46d4d8639313 100644
--- a/go/blob.pb.go
+++ b/go/blob.pb.go
@@ -135,6 +135,8 @@ It has these top-level messages:
 	HasLocalBranchesResponse
 	ChangeStorageRequest
 	ChangeStorageResponse
+	ListMergedBranchesRequest
+	ListMergedBranchesResponse
 	Repository
 	GitCommit
 	CommitAuthor
diff --git a/go/repository-service.pb.go b/go/repository-service.pb.go
index c4cca77916a2cf788e8c10cbf84dcc6f76464f54..31a07b912606815851a5380c6821bc84d87036f9 100644
--- a/go/repository-service.pb.go
+++ b/go/repository-service.pb.go
@@ -445,6 +445,62 @@ func (m *ChangeStorageResponse) String() string            { return proto.Compac
 func (*ChangeStorageResponse) ProtoMessage()               {}
 func (*ChangeStorageResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{21} }
 
+type ListMergedBranchesRequest struct {
+	Repository *Repository `protobuf:"bytes,1,opt,name=repository" json:"repository,omitempty"`
+	Into       string      `protobuf:"bytes,2,opt,name=into" json:"into,omitempty"`
+	Branches   []string    `protobuf:"bytes,3,rep,name=branches" json:"branches,omitempty"`
+}
+
+func (m *ListMergedBranchesRequest) Reset()                    { *m = ListMergedBranchesRequest{} }
+func (m *ListMergedBranchesRequest) String() string            { return proto.CompactTextString(m) }
+func (*ListMergedBranchesRequest) ProtoMessage()               {}
+func (*ListMergedBranchesRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{22} }
+
+func (m *ListMergedBranchesRequest) GetRepository() *Repository {
+	if m != nil {
+		return m.Repository
+	}
+	return nil
+}
+
+func (m *ListMergedBranchesRequest) GetInto() string {
+	if m != nil {
+		return m.Into
+	}
+	return ""
+}
+
+func (m *ListMergedBranchesRequest) GetBranches() []string {
+	if m != nil {
+		return m.Branches
+	}
+	return nil
+}
+
+type ListMergedBranchesResponse struct {
+	Repository *Repository `protobuf:"bytes,1,opt,name=repository" json:"repository,omitempty"`
+	Branches   []string    `protobuf:"bytes,2,rep,name=branches" json:"branches,omitempty"`
+}
+
+func (m *ListMergedBranchesResponse) Reset()                    { *m = ListMergedBranchesResponse{} }
+func (m *ListMergedBranchesResponse) String() string            { return proto.CompactTextString(m) }
+func (*ListMergedBranchesResponse) ProtoMessage()               {}
+func (*ListMergedBranchesResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{23} }
+
+func (m *ListMergedBranchesResponse) GetRepository() *Repository {
+	if m != nil {
+		return m.Repository
+	}
+	return nil
+}
+
+func (m *ListMergedBranchesResponse) GetBranches() []string {
+	if m != nil {
+		return m.Branches
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*RepositoryExistsRequest)(nil), "gitaly.RepositoryExistsRequest")
 	proto.RegisterType((*RepositoryExistsResponse)(nil), "gitaly.RepositoryExistsResponse")
@@ -468,6 +524,8 @@ func init() {
 	proto.RegisterType((*HasLocalBranchesResponse)(nil), "gitaly.HasLocalBranchesResponse")
 	proto.RegisterType((*ChangeStorageRequest)(nil), "gitaly.ChangeStorageRequest")
 	proto.RegisterType((*ChangeStorageResponse)(nil), "gitaly.ChangeStorageResponse")
+	proto.RegisterType((*ListMergedBranchesRequest)(nil), "gitaly.ListMergedBranchesRequest")
+	proto.RegisterType((*ListMergedBranchesResponse)(nil), "gitaly.ListMergedBranchesResponse")
 	proto.RegisterEnum("gitaly.GetArchiveRequest_Format", GetArchiveRequest_Format_name, GetArchiveRequest_Format_value)
 }
 
@@ -493,6 +551,7 @@ type RepositoryServiceClient interface {
 	GetArchive(ctx context.Context, in *GetArchiveRequest, opts ...grpc.CallOption) (RepositoryService_GetArchiveClient, error)
 	HasLocalBranches(ctx context.Context, in *HasLocalBranchesRequest, opts ...grpc.CallOption) (*HasLocalBranchesResponse, error)
 	ChangeStorage(ctx context.Context, in *ChangeStorageRequest, opts ...grpc.CallOption) (*ChangeStorageResponse, error)
+	ListMergedBranches(ctx context.Context, in *ListMergedBranchesRequest, opts ...grpc.CallOption) (*ListMergedBranchesResponse, error)
 }
 
 type repositoryServiceClient struct {
@@ -625,6 +684,15 @@ func (c *repositoryServiceClient) ChangeStorage(ctx context.Context, in *ChangeS
 	return out, nil
 }
 
+func (c *repositoryServiceClient) ListMergedBranches(ctx context.Context, in *ListMergedBranchesRequest, opts ...grpc.CallOption) (*ListMergedBranchesResponse, error) {
+	out := new(ListMergedBranchesResponse)
+	err := grpc.Invoke(ctx, "/gitaly.RepositoryService/ListMergedBranches", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // Server API for RepositoryService service
 
 type RepositoryServiceServer interface {
@@ -639,6 +707,7 @@ type RepositoryServiceServer interface {
 	GetArchive(*GetArchiveRequest, RepositoryService_GetArchiveServer) error
 	HasLocalBranches(context.Context, *HasLocalBranchesRequest) (*HasLocalBranchesResponse, error)
 	ChangeStorage(context.Context, *ChangeStorageRequest) (*ChangeStorageResponse, error)
+	ListMergedBranches(context.Context, *ListMergedBranchesRequest) (*ListMergedBranchesResponse, error)
 }
 
 func RegisterRepositoryServiceServer(s *grpc.Server, srv RepositoryServiceServer) {
@@ -846,6 +915,24 @@ func _RepositoryService_ChangeStorage_Handler(srv interface{}, ctx context.Conte
 	return interceptor(ctx, in, info, handler)
 }
 
+func _RepositoryService_ListMergedBranches_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ListMergedBranchesRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(RepositoryServiceServer).ListMergedBranches(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/gitaly.RepositoryService/ListMergedBranches",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(RepositoryServiceServer).ListMergedBranches(ctx, req.(*ListMergedBranchesRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _RepositoryService_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "gitaly.RepositoryService",
 	HandlerType: (*RepositoryServiceServer)(nil),
@@ -890,6 +977,10 @@ var _RepositoryService_serviceDesc = grpc.ServiceDesc{
 			MethodName: "ChangeStorage",
 			Handler:    _RepositoryService_ChangeStorage_Handler,
 		},
+		{
+			MethodName: "ListMergedBranches",
+			Handler:    _RepositoryService_ListMergedBranches_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{
@@ -904,58 +995,62 @@ var _RepositoryService_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("repository-service.proto", fileDescriptor8) }
 
 var fileDescriptor8 = []byte{
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+	0xa1, 0x3e, 0x95, 0xfe, 0x98, 0x3f, 0x56, 0x2a, 0xf3, 0x11, 0x6c, 0xfa, 0x62, 0x32, 0xe1, 0xba,
+	0xcf, 0x87, 0xb6, 0xd2, 0x1b, 0xb1, 0xe3, 0x6a, 0x18, 0xf5, 0x60, 0x2a, 0xf1, 0x9e, 0x7f, 0x36,
+	0xc5, 0xde, 0xf4, 0xac, 0x45, 0x7e, 0x81, 0xe6, 0xbd, 0x90, 0x13, 0xa6, 0x4d, 0xb1, 0x77, 0xba,
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+	0xa4, 0x05, 0x8d, 0xbb, 0xab, 0x5f, 0xdb, 0xb5, 0xe8, 0xe3, 0xf6, 0xd4, 0x6b, 0xd7, 0x09, 0x40,
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+	0xdd, 0xa0, 0xc7, 0x40, 0xb2, 0xc0, 0xe9, 0x53, 0x18, 0x32, 0xcd, 0xcc, 0x3d, 0xb7, 0x3d, 0xf3,
+	0x1d, 0xb5, 0xe0, 0x92, 0xa9, 0x0f, 0xc2, 0x67, 0xc1, 0x99, 0x64, 0xa1, 0x3f, 0xae, 0xf4, 0x10,
+	0xe8, 0x1b, 0x70, 0xf2, 0x70, 0x36, 0xfc, 0x2e, 0xac, 0x3f, 0xb2, 0x60, 0x86, 0x96, 0x84, 0x63,
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+	0x57, 0xfa, 0x1a, 0xe5, 0x08, 0x87, 0xff, 0x43, 0x45, 0xa2, 0xa2, 0xf3, 0x50, 0x0b, 0x9b, 0x87,
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+	0x54, 0x69, 0x41, 0x9c, 0xb1, 0x6c, 0x93, 0x4f, 0xd0, 0x5e, 0xd5, 0x52, 0xf2, 0x3a, 0x1f, 0x65,
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+	0xf6, 0x60, 0xa1, 0x16, 0xbb, 0x3f, 0x7c, 0x65, 0x47, 0x82, 0xfd, 0x0e, 0x20, 0x55, 0x3c, 0x72,
+	0xb8, 0x7c, 0x24, 0xa3, 0xb9, 0xae, 0x5b, 0xb4, 0x94, 0xc0, 0xfc, 0x06, 0x3b, 0xcb, 0x82, 0x45,
+	0x5e, 0x25, 0x6f, 0xb5, 0x48, 0x3a, 0xdd, 0xef, 0xcb, 0x96, 0xb3, 0x90, 0xcb, 0xe2, 0x94, 0x42,
+	0x16, 0x2a, 0x60, 0x0a, 0x59, 0xac, 0x69, 0xb4, 0x46, 0x7e, 0x07, 0x92, 0x17, 0x15, 0x92, 0xd4,
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+	0xcb, 0x2b, 0x95, 0x7b, 0x54, 0xb8, 0x96, 0x20, 0x7d, 0x82, 0xf6, 0x2a, 0x27, 0xa7, 0xa3, 0x54,
+	0x42, 0xfe, 0xe9, 0x28, 0x95, 0xd2, 0x79, 0x8d, 0xf4, 0x00, 0x52, 0x8a, 0x4b, 0xdb, 0x9d, 0xe3,
+	0xd3, 0xb4, 0xdd, 0x79, 0x46, 0xa4, 0xb5, 0x37, 0xf5, 0x28, 0xc3, 0x55, 0xca, 0x4a, 0x33, 0x2c,
+	0xe1, 0xc6, 0x34, 0xc3, 0x32, 0xb6, 0xa3, 0x35, 0x72, 0x03, 0xcf, 0x97, 0x38, 0x86, 0xbc, 0x4c,
+	0xae, 0x55, 0x40, 0x78, 0xee, 0xab, 0x92, 0xd5, 0x6c, 0xcf, 0xf3, 0xcc, 0x90, 0xf6, 0xbc, 0x94,
+	0xb6, 0xd2, 0x9e, 0x97, 0x13, 0x0b, 0xad, 0x0d, 0x9a, 0xe6, 0xb7, 0xfc, 0xed, 0xbf, 0x01, 0x00,
+	0x00, 0xff, 0xff, 0x62, 0x0f, 0x63, 0x66, 0xc8, 0x0b, 0x00, 0x00,
 }
diff --git a/repository-service.proto b/repository-service.proto
index 9c94e9d9a37af0e1b5dad1ecc43fbe9405cbdbc7..c72fbd69755a11e08638dee64b48b0cb4376dff5 100644
--- a/repository-service.proto
+++ b/repository-service.proto
@@ -16,6 +16,7 @@ service RepositoryService {
   rpc GetArchive(GetArchiveRequest) returns (stream GetArchiveResponse) {}
   rpc HasLocalBranches(HasLocalBranchesRequest) returns (HasLocalBranchesResponse) {}
   rpc ChangeStorage(ChangeStorageRequest) returns (ChangeStorageResponse) {}
+  rpc ListMergedBranches(ListMergedBranchesRequest) returns (ListMergedBranchesResponse) {}
 }
 
 message RepositoryExistsRequest {
@@ -112,3 +113,14 @@ message ChangeStorageRequest {
 }
 
 message ChangeStorageResponse {}
+
+message ListMergedBranchesRequest {
+  Repository repository = 1;
+  string into = 2;
+  repeated string branches = 3;
+}
+
+message ListMergedBranchesResponse {
+  Repository repository = 1;
+  repeated string branches = 2;
+}
diff --git a/ruby/lib/gitaly/repository-service_pb.rb b/ruby/lib/gitaly/repository-service_pb.rb
index bb5478715d4b582fd5636a2dbce1909808094d91..046c384a2320273938de9b1232c7aa80a82424d7 100644
--- a/ruby/lib/gitaly/repository-service_pb.rb
+++ b/ruby/lib/gitaly/repository-service_pb.rb
@@ -83,6 +83,15 @@ Google::Protobuf::DescriptorPool.generated_pool.build do
   end
   add_message "gitaly.ChangeStorageResponse" do
   end
+  add_message "gitaly.ListMergedBranchesRequest" do
+    optional :repository, :message, 1, "gitaly.Repository"
+    optional :into, :string, 2
+    repeated :branches, :string, 3
+  end
+  add_message "gitaly.ListMergedBranchesResponse" do
+    optional :repository, :message, 1, "gitaly.Repository"
+    repeated :branches, :string, 2
+  end
 end
 
 module Gitaly
@@ -109,4 +118,6 @@ module Gitaly
   HasLocalBranchesResponse = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.HasLocalBranchesResponse").msgclass
   ChangeStorageRequest = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.ChangeStorageRequest").msgclass
   ChangeStorageResponse = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.ChangeStorageResponse").msgclass
+  ListMergedBranchesRequest = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.ListMergedBranchesRequest").msgclass
+  ListMergedBranchesResponse = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.ListMergedBranchesResponse").msgclass
 end
diff --git a/ruby/lib/gitaly/repository-service_services_pb.rb b/ruby/lib/gitaly/repository-service_services_pb.rb
index 10ba8d42b5e45037049e98208da9e8f8da0c116c..6f3f668bdd70abc3d7d346b562b7c01a8e6154c4 100644
--- a/ruby/lib/gitaly/repository-service_services_pb.rb
+++ b/ruby/lib/gitaly/repository-service_services_pb.rb
@@ -25,6 +25,7 @@ module Gitaly
       rpc :GetArchive, GetArchiveRequest, stream(GetArchiveResponse)
       rpc :HasLocalBranches, HasLocalBranchesRequest, HasLocalBranchesResponse
       rpc :ChangeStorage, ChangeStorageRequest, ChangeStorageResponse
+      rpc :ListMergedBranches, ListMergedBranchesRequest, ListMergedBranchesResponse
     end
 
     Stub = Service.rpc_stub_class