Hi all! I am wondering what is the best practice, in prefect 2.0 orion, to trigger a flow run if a run of another flow fails. My concrete use case is the following: I would like to send a slack message as an alert in case a periodic flow (let's call it _flow_A_) fails. I have already set up _flow_B_ that sends a slack message using prefect-slack collection. I just need to trigger it with some input if a run of _flow_A_ fails

I wanted to tell you to check Prefect 1.0 Automations, but given you mentioned the

prefect-slack

collection, I assume you rather ask for Prefect 2.0?

yes sorry, I am using prefect 2.0 . I've just updated the message.

thanks, I think this should work:

from prefect import task, flow
from prefect.futures import PrefectFuture
from prefect_slack import SlackWebhook
from prefect_slack.messages import send_incoming_webhook_message


def send_slack_alert_on_failure(task_future: PrefectFuture):
    task_future.wait()  # block until completion
    if task_future.get_state().is_failed():
        name_ = task_future.task_run.name
        id_ = task_future.task_run.flow_run_id
        send_incoming_webhook_message(
            slack_webhook=SlackWebhook("<https://hooks.slack.com/services/xx/xx/xxx>"),
            text=f"The task `{name_}` failed in a flow run `{id_}`",
        )


@task
def fail_successfully(x):
    return 1 / x


@flow
def main_flow(nr: int):
    future_obj = fail_successfully(nr)
    send_slack_alert_on_failure(future_obj)


if __name__ == "__main__":
    main_flow(nr=0)

amazing! many thanks @Anna Geller