Add back Deprecation warning for sla_miss_callback

task-sdk/src/airflow/sdk/bases/operator.py

@@ -1108,7 +1108,7 @@ def __init__(
             raise ValueError(f"pool slots for {self.task_id}{dag_str} cannot be less than 1")
         if sla is not None:
             warnings.warn(
-                "The SLA feature is removed in Airflow 3.0, to be replaced with a new implementation in >=3.1",
+                "The SLA feature is removed in Airflow 3.0, replaced with Deadline Alerts in >=3.1",
                 stacklevel=2,
             )
 

task-sdk/src/airflow/sdk/definitions/dag.py

@@ -460,6 +460,7 @@ def __rich_repr__(self):
         ),
     )
 
+    sla_miss_callback: None = attrs.field(default=None)
     catchup: bool = attrs.field(
         factory=_config_bool_factory("scheduler", "catchup_by_default"),
     )
@@ -614,6 +615,15 @@ def _has_on_success_callback(self) -> bool:
     def _has_on_failure_callback(self) -> bool:
         return self.on_failure_callback is not None
 
+    @sla_miss_callback.validator
+    def _validate_sla_miss_callback(self, _, value):
+        if value is not None:
+            warnings.warn(
+                "The SLA feature is removed in Airflow 3.0, and replaced with a Deadline Alerts in >=3.1",
+                stacklevel=2,
+            )
+        return value
+
     def __repr__(self):
         return f"<DAG: {self.dag_id}>"