Fix runtime review findings

clients/go/mxgateway/galaxy.go

@@ -13,6 +13,8 @@ import (
 	"google.golang.org/protobuf/types/known/timestamppb"
 )
 
+const discoverHierarchyPageSize = 5000
+
 // RawGalaxyRepositoryClient is the generated gRPC client interface for the
 // Galaxy Repository service exposed for callers that need direct contract
 // access.
@@ -70,6 +72,10 @@ func DialGalaxy(ctx context.Context, opts Options) (*GalaxyClient, error) {
 		grpc.WithTransportCredentials(transportCredentials),
 		grpc.WithUnaryInterceptor(unaryAuthInterceptor(opts.APIKey)),
 		grpc.WithStreamInterceptor(streamAuthInterceptor(opts.APIKey)),
+		grpc.WithDefaultCallOptions(
+			grpc.MaxCallRecvMsgSize(resolveMaxGrpcMessageBytes(opts)),
+			grpc.MaxCallSendMsgSize(resolveMaxGrpcMessageBytes(opts)),
+		),
 		grpc.WithBlock(),
 	}
 	dialOptions = append(dialOptions, opts.DialOptions...)
@@ -141,11 +147,23 @@ func (c *GalaxyClient) DiscoverHierarchy(ctx context.Context) ([]*GalaxyObject,
 	callCtx, cancel := c.callContext(ctx)
 	defer cancel()
 
-	reply, err := c.raw.DiscoverHierarchy(callCtx, &pb.DiscoverHierarchyRequest{})
-	if err != nil {
-		return nil, &GatewayError{Op: "galaxy discover hierarchy", Err: err}
+	var objects []*GalaxyObject
+	pageToken := ""
+	for {
+		reply, err := c.raw.DiscoverHierarchy(callCtx, &pb.DiscoverHierarchyRequest{
+			PageSize:  discoverHierarchyPageSize,
+			PageToken: pageToken,
+		})
+		if err != nil {
+			return nil, &GatewayError{Op: "galaxy discover hierarchy", Err: err}
+		}
+		objects = append(objects, reply.GetObjects()...)
+		pageToken = reply.GetNextPageToken()
+		if pageToken == "" {
+			break
+		}
 	}
-	return reply.GetObjects(), nil
+	return objects, nil
 }
 
 // WatchDeployEventsRaw starts the generated WatchDeployEvents stream for callers