jedcunningham commented on pull request #20151:
URL: https://github.com/apache/airflow/pull/20151#issuecomment-990208083


   Ready for another look. I've:
   
   - Added a section on migrating from "smart" -> deferrable 
   - Added a link to that section in the deprecation warnings and UPDATING
   - Added a deprecation warning when a sensor task becomes "smart" - this 
lands in the task log
   - Added the list of sensors that are allowed to be "smart" in the 
SchedulerJob deprecation warning:
      ```
      Smart sensors are deprecated, yet can be used for 
{'NamedHivePartitionSensor'} sensors. Please use Deferrable Operators instead. 
See 
http://apache-airflow-docs.s3-website.eu-central-1.amazonaws.com/docs/apache-airflow/latest/concepts/smart-sensors.html#migrating-to-deferrable-operators
 for more info.
      ```
   
   The SchedulerJob message is intended for the folks operating Airflow, and 
the message in the task log for end users.


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