YingboWang opened a new pull request #8624:
URL: https://github.com/apache/airflow/pull/8624


   ---
   Make sure to mark the boxes below before creating PR: [x]
   
   Address github issue #8619 
   When there is an inconsistency between executor event return state and DB 
state. It is hard to debug the root cause and for celery executor we need to 
query logs from all workers. The reason is that at this time DB hostname was 
not updated and we don't know which worker have picked up the task and caused 
the failure. If we have the hostname with the executor event, we will be able 
to identify the host and debug root cause on that host. It could reduce time 
and operations to find out problematic host.
   
   Implementation:
   Change value type of event_buffer from str state to tuple of state and info. 
Add hostname to the celery command failed exception information and pass celery 
info into event_buffer.
   
   - [x] Description above provides context of the change
   - [x] Unit tests coverage for changes (not needed for documentation changes)
   - [x] Target Github ISSUE in description if exists
   - [x] Commits follow "[How to write a good git commit 
message](http://chris.beams.io/posts/git-commit/)"
   - [x] Relevant documentation is updated including usage instructions.
   - [x] I will engage committers as explained in [Contribution Workflow 
Example](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#contribution-workflow-example).
   
   ---
   In case of fundamental code change, Airflow Improvement Proposal 
([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals))
 is needed.
   In case of a new dependency, check compliance with the [ASF 3rd Party 
License Policy](https://www.apache.org/legal/resolved.html#category-x).
   In case of backwards incompatible changes please leave a note in 
[UPDATING.md](https://github.com/apache/airflow/blob/master/UPDATING.md).
   Read the [Pull Request 
Guidelines](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#pull-request-guidelines)
 for more information.
   


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