feat(transport/grpc): support custom healthcheck (#2541)

* feat(transport/grpc): support custom healthcheck

* fix: parameters grpc server

* fix(transport/grpc): optional CustomHealth

* fix(transport/grpc): useless argument

transport/grpc/server.go

@@ -67,6 +67,13 @@ func Middleware(m ...middleware.Middleware) ServerOption {
 	}
 }
 
+// CustomHealth Checks server.
+func CustomHealth() ServerOption {
+	return func(s *Server) {
+		s.customHealth = true
+	}
+}
+
 // TLSConfig with TLS config.
 func TLSConfig(c *tls.Config) ServerOption {
 	return func(s *Server) {
@@ -118,6 +125,7 @@ type Server struct {
 	streamInts   []grpc.StreamServerInterceptor
 	grpcOpts     []grpc.ServerOption
 	health       *health.Server
+	customHealth bool
 	metadata     *apimd.Server
 }
 
@@ -159,7 +167,9 @@ func NewServer(opts ...ServerOption) *Server {
 	srv.Server = grpc.NewServer(grpcOpts...)
 	srv.metadata = apimd.NewServer(srv.Server)
 	// internal register
+	if !srv.customHealth {
 		grpc_health_v1.RegisterHealthServer(srv.Server, srv.health)
+	}
 	apimd.RegisterMetadataServer(srv.Server, srv.metadata)
 	reflection.Register(srv.Server)
 	return srv