[GitHub] [airflow] vandonr-amz opened a new pull request, #30612: Create a metric for task adoption time

[via GitHub]

vandonr-amz opened a new pull request, #30612:
URL: https://github.com/apache/airflow/pull/30612

   It is wrongly mentioned in the doc that adoption time can be computed by 
subtracting task running time from task landing time, but the landing time 
includes a lot more than this.
   I made a little graph to resume the different timings we currently have 
access to:
   <img width="950" alt="image" 
src="https://user-images.githubusercontent.com/114772123/231599497-0a061a01-a9c0-42d0-9fb3-7ede6c2a163b.png";>
   the landing time in purple is only available in the airflow UI. In black are 
the metrics currently being sent, and I'm proposing to add the orange one in 
this PR.
   (I made this graph from my understanding of the code, it may be inaccurate. 
If so, tell me!)
   
   Adoption time is an interesting metric for users, to set the adoption 
timeout, but also to manage the scale of their Celery setup. Being able to have 
it on a dashboard would be nice.


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