dstandish opened a new pull request #20150:
URL: https://github.com/apache/airflow/pull/20150


   The language "when two tasks defer based on the same trigger" is a bit 
confusing. Many tasks can reuse the same trigger class.  But two tasks can't 
defer using the same trigger _instance_. I think what's important to call out 
here, and what I try to make clearer, is that the exact same instance of the 
trigger may have multiple copies of itself running.
   
   Additionally I clarify cleanup is not _only_ called "when this happens" 
(that is, when trigger is "suddenly removed"), but called every time the 
trigger instance exits, no matter the reason.
   
   cc @andrewgodwin 


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