jedcunningham commented on code in PR #61079:
URL: https://github.com/apache/airflow/pull/61079#discussion_r2739620450


##########
airflow-core/src/airflow/dag_processing/manager.py:
##########
@@ -1195,10 +1195,18 @@ def process_parse_results(
             run_count=run_count + 1,
         )
 
-    # TODO: AIP-66 emit metrics
-    # file_name = Path(dag_file.path).stem
-    # Stats.timing(f"dag_processing.last_duration.{file_name}", 
stat.last_duration)
-    # Stats.timing("dag_processing.last_duration", stat.last_duration, 
tags={"file_name": file_name})
+    # Note: relative_fileloc has a None default. In practice it is always 
provided but code defensively here in case
+    if relative_fileloc is not None and stat.last_duration is not None:
+        # Normalize names to ensure they only contain valid characters for 
stats (alphanumeric, underscore, dot, dash)
+        file_name = normalize_name_for_stats(Path(relative_fileloc).stem)
+        # bundle_name is included to distinguish files with the same name 
across different bundles
+        normalized_bundle = normalize_name_for_stats(bundle_name)
+        
Stats.timing(f"dag_processing.last_duration.{normalized_bundle}.{file_name}", 
stat.last_duration)
+        Stats.timing(
+            "dag_processing.last_duration",
+            stat.last_duration,
+            tags={"file_name": file_name, "bundle_name": normalized_bundle},

Review Comment:
   Should this one be using the "raw" relative fileloc instead?



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