vincbeck opened a new pull request, #44369:
URL: https://github.com/apache/airflow/pull/44369
Resolves #42513 and #42514.
The purpose of this PR is to send events to assets when some watchers are
associated to them. Example:
```
trigger = MyQueueTrigger(queue="<my_queue>")
asset = Asset("test_asset", watchers=[trigger])
with DAG(
dag_id="example",
schedule=[asset],
):
task = EmptyOperator(task_id="task",)
```
As part of AIP-82, it is now possible to associate `watchers` to an asset.
These watchers are triggers. By associating a trigger to an asset, whenever the
trigger fires, the goal is to update the asset. This PR handles that part, when
a trigger fires, it updates its associated triggers.
I also updated the logic behind how the triggers are cleaned up by the
triggerer. These triggers that are associated to an assets long as long as the
association between the trigger and the asset is defined in the DAG.
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