ephraimbuddy commented on code in PR #31887:
URL: https://github.com/apache/airflow/pull/31887#discussion_r1236484309


##########
airflow/notifications/basenotifier.py:
##########
@@ -79,15 +79,30 @@ def notify(self, context: Context) -> None:
         """
         ...
 
-    def __call__(self, context: Context) -> None:
+    def __call__(self, *args) -> None:
         """
         Send a notification.
 
         :param context: The airflow context
         """
-        context = self._update_context(context)
-        self.render_template_fields(context)
+        # Currently, there are two ways a callback is invoked
+        # 1. callback(context) - for on_*_callbacks
+        # 2. callback(dag, task_list, blocking_task_list, slas, blocking_tis) 
- for sla_miss_callback
+        # we have to distinguish between the two calls so that we can prepare 
the correct context,
+        # comparing len(args) is one straightforward way of checking this.
+        if len(args) == 1:
+            _context = args[0]

Review Comment:
   Yeah. That's true. I wonder how possible it would be to use 
`provide_session` and get context from one of the dags task instances? 



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