uranusjr commented on a change in pull request #19173:
URL: https://github.com/apache/airflow/pull/19173#discussion_r734844348



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File path: docs/apache-airflow/concepts/tasks.rst
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@@ -163,6 +163,10 @@ If you want to disable SLA checking entirely, you can set 
``check_slas = False``
 
 To read more about configuring the emails, see :doc:`/howto/email-config`.
 
+.. note::
+
+    Only scheduled tasks, in a DAG with a valid ``schedule_interval``, will be 
checked against SLA.  For more information on ``schedule_interval`` values, see 
:doc:`DAG Run </dag-run>`.

Review comment:
       `schedule_interval=None` is also "valid" so this is not strictly 
accurate. I think it is sufficient to just say "scheduled tasks" (since no runs 
would be scheduled with `schedule_interval=None`). Or, if you want to be 
explicit, add something like *For example, a DAG with `schedule_interval=None` 
will neve trigger SLA since no scheduled runs would ever be made*.




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