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airflow icon legend - what is the meaning of a ring around a task in the webserver's treeview?

New to airflow here, and wondering if there's an icon legend in the docs somewhere. I was not able to find.

More particularly, what's the meaning of a circle around a task in the webserver's treeview: enter image description here

For example, in the example_complex example from the getting started tutorial:

enter image description here

Solution

  • The meaning is that the tasks with the black thicker border, can be unfolded on click and display downstream tasks. By default this will group and hide downstream tasks that were not started or even duplicated branches. It's like a UI helper to avoid showing too much information at once.

    For example, if there are 10 tasks with a downstream task named end, it is likely that it will be displayed only once by default.

    Example of default tree view:

    default tree view

    After clicking the node called: "get_processable_"

    clicking the node called: get_processable_