potiuk commented on code in PR #76110:
URL: https://github.com/apache/airflow/pull/76110#discussion_r4435956254


##########
airflow-core/newsfragments/76110.feature.rst:
##########
@@ -0,0 +1 @@
+The callback context now includes a ``callback`` key whose ``source`` field 
tells you whether the callback ran at the Dag level or the task level.

Review Comment:
   **In airflow-core/ use only significant newsfragments**
   
   > In `airflow-core/` use only `significant` newsfragments, and only for a 
change users must read before upgrading: a behavior change, a removal or a new 
default, or migration steps. [...] Never add one for an ordinary bug fix, 
feature, improvement or doc change
   
   This is a new feature rather than something users must read before 
upgrading, so this newsfragment should be dropped; the release notes pick the 
change up from the PR.



##########
task-sdk/src/airflow/sdk/definitions/context.py:
##########
@@ -18,10 +18,35 @@
 from __future__ import annotations
 
 import copy
+import enum
 import os
 from collections.abc import MutableMapping
 from typing import TYPE_CHECKING, Any, NamedTuple, NotRequired, TypedDict, cast
 
+
+class CallbackSource(str, enum.Enum):
+    """Whether a callback was triggered at the DAG level or the task level."""

Review Comment:
   **Write Dag (title case) in all prose**
   
   > Write **Dag** (title case) in all prose. Keep the all-caps or lowercase 
spelling only when reproducing a literal code token
   
   "Dag level" here, and "defined on the Dag" in the `CallbackMeta` docstring 
below.



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