diff --git a/airflow-core/src/airflow/dag_processing/manager.py b/airflow-core/src/airflow/dag_processing/manager.py
index 72e51e48743da..e0f3b662b7d04 100644
--- a/airflow-core/src/airflow/dag_processing/manager.py
+++ b/airflow-core/src/airflow/dag_processing/manager.py
@@ -969,7 +969,7 @@ def _log_file_processing_stats(self, known_files: dict[str, set[DagFileInfo]]):
                 proc = self._processors.get(file)
                 num_dags = stat.num_dags
                 num_errors = stat.import_errors
-                file_name = Path(file.rel_path).stem
+                file_name = normalize_name_for_stats(Path(file.rel_path).stem)
                 processor_pid = proc.pid if proc else None
                 processor_start_time = proc.start_time if proc else None
                 runtime = (now - processor_start_time) if processor_start_time else None
diff --git a/airflow-core/tests/unit/dag_processing/test_manager.py b/airflow-core/tests/unit/dag_processing/test_manager.py
index 40b819f146e1f..1bc6fd29c0842 100644
--- a/airflow-core/tests/unit/dag_processing/test_manager.py
+++ b/airflow-core/tests/unit/dag_processing/test_manager.py
@@ -1359,6 +1359,25 @@ def test_send_file_processing_statsd_timing(
             tags={"bundle_name": bundle_name, "file_name": dag_filename[:-3]},
         )
 
+    @mock.patch("airflow.dag_processing.manager.stats.gauge")
+    def test_log_file_processing_stats_sanitizes_last_run_seconds_ago_metric_name(self, statsd_gauge_mock):
+        manager = DagFileProcessorManager(max_runs=1)
+        dag_file = DagFileInfo(
+            bundle_name="testing",
+            rel_path=Path("test_of sprak_opertaor.py"),
+            bundle_path=TEST_DAGS_FOLDER,
+        )
+        manager._file_stats[dag_file] = DagFileStat(
+            last_finish_time=timezone.utcnow() - timedelta(seconds=5),
+        )
+
+        manager._log_file_processing_stats({"testing": {dag_file}})
+
+        statsd_gauge_mock.assert_any_call(
+            "dag_processing.last_run.seconds_ago.test_of_sprak_opertaor",
+            mock.ANY,
+        )
+
     @pytest.mark.usefixtures("testing_dag_bundle")
     def test_refresh_dags_dir_doesnt_delete_zipped_dags(
         self, tmp_path, session, configure_testing_dag_bundle, test_zip_path