1fanwang commented on code in PR #50677:
URL: https://github.com/apache/airflow/pull/50677#discussion_r2093554618


##########
airflow-core/src/airflow/models/deadline.py:
##########
@@ -123,7 +122,71 @@ class DeadlineReference(Enum):
     dag.deadline.reference.evaluate_with(dag_id=dag.dag_id)
     """
 
+    # Available References.
+    #
+    # The value is the name of the method executed to fetch the datetime
+    # value for the given Reference. For example DAGRUN_LOGICAL_DATE = 
"dagrun_logical_date"
+    # will execute dagrun_logical_date() to find the dagrun's logical date.
     DAGRUN_LOGICAL_DATE = "dagrun_logical_date"
+    DAGRUN_QUEUED_AT = "dagrun_queued_at"
+    _CUSTOM_REFERENCE_BASE = "_custom_reference"

Review Comment:
   curious what we plan to use `_CUSTOM_REFERENCE_BASE` for



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