Hi, In 1.0 one of task arguments is state_handlers but it is not in 2.0. What is the new way of invoking state handlers?

just to make sure I understand the context, what do you want to do with state handlers?

To send Slack message when flow run fail. I found this, should be good: https://discourse.prefect.io/t/how-to-take-action-on-a-state-change-of-a-task-run-task-level-state-handler/82

Yes, you can also do exactly that through the UI. I wrote an article on how to do that