diff --git a/internal/core/src/exec/operator/RescoresNode.cpp b/internal/core/src/exec/operator/RescoresNode.cpp
index 87f22f8f92..437f6391ba 100644
--- a/internal/core/src/exec/operator/RescoresNode.cpp
+++ b/internal/core/src/exec/operator/RescoresNode.cpp
@@ -54,6 +54,10 @@ PhyRescoresNode::GetOutput() {
     if (input_ == nullptr) {
         return nullptr;
     }
+
+    std::chrono::high_resolution_clock::time_point scalar_start =
+        std::chrono::high_resolution_clock::now();
+
     ExecContext* exec_context = operator_context_->get_exec_context();
     auto query_context_ = exec_context->get_query_context();
     auto query_info = exec_context->get_query_config();
@@ -142,6 +146,13 @@ PhyRescoresNode::GetOutput() {
     bool large_is_better = PositivelyRelated(metric_type);
     sort_search_result(search_result, large_is_better);
     query_context_->set_search_result(std::move(search_result));
+
+    std::chrono::high_resolution_clock::time_point scalar_end =
+        std::chrono::high_resolution_clock::now();
+    double scalar_cost =
+        std::chrono::duration<double, std::micro>(scalar_end - scalar_start)
+            .count();
+    monitor::internal_core_search_latency_rescore.Observe(scalar_cost / 1000);
     return input_;
 };
 
diff --git a/internal/core/src/monitor/Monitor.cpp b/internal/core/src/monitor/Monitor.cpp
index d75a9d21c7..8a8a3b2deb 100644
--- a/internal/core/src/monitor/Monitor.cpp
+++ b/internal/core/src/monitor/Monitor.cpp
@@ -163,6 +163,8 @@ std::map<std::string, std::string> groupbyLatencyLabels{
     {"type", "groupby_latency"}};
 std::map<std::string, std::string> iterativeFilterLatencyLabels{
     {"type", "iterative_filter_latency"}};
+std::map<std::string, std::string> rescoreLatencyLabels{
+    {"type", "rescore_latency"}};
 std::map<std::string, std::string> scalarProportionLabels{
     {"type", "scalar_proportion"}};
 std::map<std::string, std::string> getVectorLatencyLabels{
@@ -192,6 +194,9 @@ DEFINE_PROMETHEUS_HISTOGRAM(internal_core_search_latency_groupby,
 DEFINE_PROMETHEUS_HISTOGRAM(internal_core_search_latency_iterative_filter,
                             internal_core_search_latency,
                             iterativeFilterLatencyLabels)
+DEFINE_PROMETHEUS_HISTOGRAM(internal_core_search_latency_rescore,
+                            internal_core_search_latency,
+                            rescoreLatencyLabels)
 DEFINE_PROMETHEUS_HISTOGRAM_WITH_BUCKETS(
     internal_core_search_latency_scalar_proportion,
     internal_core_search_latency,
diff --git a/internal/core/src/monitor/Monitor.h b/internal/core/src/monitor/Monitor.h
index 1655ed631d..b4c3f96890 100644
--- a/internal/core/src/monitor/Monitor.h
+++ b/internal/core/src/monitor/Monitor.h
@@ -72,6 +72,7 @@ DECLARE_PROMETHEUS_HISTOGRAM(internal_core_search_latency_scalar);
 DECLARE_PROMETHEUS_HISTOGRAM(internal_core_search_latency_vector);
 DECLARE_PROMETHEUS_HISTOGRAM(internal_core_search_latency_groupby);
 DECLARE_PROMETHEUS_HISTOGRAM(internal_core_search_latency_iterative_filter);
+DECLARE_PROMETHEUS_HISTOGRAM(internal_core_search_latency_rescore);
 DECLARE_PROMETHEUS_HISTOGRAM(internal_core_search_latency_scalar_proportion);
 DECLARE_PROMETHEUS_HISTOGRAM(internal_core_get_vector_latency);
 DECLARE_PROMETHEUS_HISTOGRAM(internal_core_retrieve_get_target_entry_latency);