potiuk commented on issue #24279:
URL: https://github.com/apache/airflow/issues/24279#issuecomment-1148628174

   > @potiuk I could open a PR, but the main reason I opened this issue is that 
I would hope that someone already knows how the `upstream_failed` status 
trickles downstream, while I only know the two examples I made above (and there 
are a larger number of trigger rules). I would also like to understand if there 
is a solution for the use case I have written above (for which I can put 
together an example if needed), and if not I would think that there is 
something missing in the functionality itself.
   
   I think if it is not documented, then the only way to check is to look it up 
in the code. And then person, who has already made a considerable effort to 
look up is llikely the best to document it. Trying to document it, is likely 
best way to learn it (especially that you will get maintainer's help with 
that). 
   
   There is no "must" here  of course - but if you will not do it then it will 
have to wait for someone who would like to. That's why I marked it as "good 
first issue" - sounds a good issue for someone who would like to spend their 
time on digging in.
   
   Also you might not understand how open-source works. Issues will get 
implemented because someone would like to take care about them, not because 
they are opened. So if your goal was to "create the documentation for it", the 
most certain way is to implement it by you. Otherwise it will have to wait for 
someone to pick it up. 


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