diff --git a/cartographer/mapping/internal/global_trajectory_builder.cc b/cartographer/mapping/internal/global_trajectory_builder.cc
index 81e4a9b..2296e10 100644
--- a/cartographer/mapping/internal/global_trajectory_builder.cc
+++ b/cartographer/mapping/internal/global_trajectory_builder.cc
@@ -19,13 +19,18 @@
 #include <memory>
 
 #include "cartographer/common/make_unique.h"
+#include "cartographer/common/time.h"
 #include "cartographer/mapping/local_slam_result_data.h"
+#include "cartographer/metrics/family_factory.h"
 #include "glog/logging.h"
 
 namespace cartographer {
 namespace mapping {
 namespace {
 
+static auto* kLocalSlamMatchingResults = metrics::Counter::Null();
+static auto* kLocalSlamInsertionResults = metrics::Counter::Null();
+
 template <typename LocalTrajectoryBuilder, typename PoseGraph>
 class GlobalTrajectoryBuilder : public mapping::TrajectoryBuilderInterface {
  public:
@@ -59,8 +64,10 @@ class GlobalTrajectoryBuilder : public mapping::TrajectoryBuilderInterface {
       // The range data has not been fully accumulated yet.
       return;
     }
+    kLocalSlamMatchingResults->Increment();
     std::unique_ptr<InsertionResult> insertion_result;
     if (matching_result->insertion_result != nullptr) {
+      kLocalSlamInsertionResults->Increment();
       auto node_id = pose_graph_->AddNode(
           matching_result->insertion_result->constant_data, trajectory_id_,
           matching_result->insertion_result->insertion_submaps);
@@ -149,5 +156,13 @@ std::unique_ptr<TrajectoryBuilderInterface> CreateGlobalTrajectoryBuilder3D(
       local_slam_result_callback);
 }
 
+void GlobalTrajectoryBuilderRegisterMetrics(metrics::FamilyFactory* factory) {
+  auto* results = factory->NewCounterFamily(
+      "/mapping/internal/global_trajectory_builder/local_slam_results",
+      "Local SLAM results");
+  kLocalSlamMatchingResults = results->Add({{"type", "MatchingResult"}});
+  kLocalSlamInsertionResults = results->Add({{"type", "InsertionResult"}});
+}
+
 }  // namespace mapping
 }  // namespace cartographer
diff --git a/cartographer/mapping/internal/global_trajectory_builder.h b/cartographer/mapping/internal/global_trajectory_builder.h
index a6fe399..754912d 100644
--- a/cartographer/mapping/internal/global_trajectory_builder.h
+++ b/cartographer/mapping/internal/global_trajectory_builder.h
@@ -25,6 +25,7 @@
 #include "cartographer/mapping/internal/3d/pose_graph_3d.h"
 #include "cartographer/mapping/local_slam_result_data.h"
 #include "cartographer/mapping/trajectory_builder_interface.h"
+#include "cartographer/metrics/family_factory.h"
 
 namespace cartographer {
 namespace mapping {
@@ -41,6 +42,9 @@ std::unique_ptr<TrajectoryBuilderInterface> CreateGlobalTrajectoryBuilder3D(
     const TrajectoryBuilderInterface::LocalSlamResultCallback&
         local_slam_result_callback);
 
+void GlobalTrajectoryBuilderRegisterMetrics(
+    metrics::FamilyFactory* family_factory);
+
 }  // namespace mapping
 }  // namespace cartographer
 
diff --git a/cartographer/metrics/register.cc b/cartographer/metrics/register.cc
index 4576693..283544d 100644
--- a/cartographer/metrics/register.cc
+++ b/cartographer/metrics/register.cc
@@ -20,6 +20,7 @@
 #include "cartographer/mapping/internal/2d/pose_graph/constraint_builder_2d.h"
 #include "cartographer/mapping/internal/3d/local_trajectory_builder_3d.h"
 #include "cartographer/mapping/internal/3d/pose_graph/constraint_builder_3d.h"
+#include "cartographer/mapping/internal/global_trajectory_builder.h"
 
 namespace cartographer {
 namespace metrics {
@@ -27,6 +28,7 @@ namespace metrics {
 void RegisterAllMetrics(FamilyFactory* registry) {
   mapping::pose_graph::ConstraintBuilder2D::RegisterMetrics(registry);
   mapping::pose_graph::ConstraintBuilder3D::RegisterMetrics(registry);
+  mapping::GlobalTrajectoryBuilderRegisterMetrics(registry);
   mapping::LocalTrajectoryBuilder2D::RegisterMetrics(registry);
   mapping::LocalTrajectoryBuilder3D::RegisterMetrics(registry);
 }