ashb commented on a change in pull request #17502:
URL: https://github.com/apache/airflow/pull/17502#discussion_r690287118



##########
File path: airflow/models/dagrun.py
##########
@@ -286,7 +287,17 @@ def find(
     @staticmethod
     def generate_run_id(run_type: DagRunType, execution_date: datetime) -> str:
         """Generate Run ID based on Run Type and Execution Date"""
-        return f"{run_type}__{execution_date.isoformat()}"
+        from airflow.configuration import conf
+        local_run_id = conf.getboolean("core", "localize_dag_run_id", 
fallback=False)
+        if local_run_id:
+            local_time = 
pendulum.instance(execution_date).astimezone(tz=settings.TIMEZONE)
+            is_dst = local_time.is_dst()
+            if is_dst:
+                return f"{run_type}__{local_time.isoformat()}__DST"

Review comment:
       I don't see the need for this suffix -- when it's in DST the timezone 
offset will already be different (`+00:00` vs `+01:00__DST` in your example for 
UK)




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