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In v2 what are you using in place of state handlers? I would like to build  a consistent way to send a customized slack notification when any task in a flow fails.

We just added success and failure hooks for flows and tasks: <https://github.com/PrefectHQ/prefect/blob/main/RELEASE-NOTES.md#release-283>. It sounds like the task failure hook would be useful for you here.