@Marvin I need task failure alert in a flow version 2

To set up task failure alerts in a Prefect 2.x flow, there are several steps you can follow. Prefect provides methods to handle task retries and to set up notification blocks like Slack for reporting failures. Here are the key steps: 1. Retry Logic: You can specify retry behaviors for your tasks to handle transient errors. 2. Notification Blocks: Set up notification blocks for alerts like Slack or email. Here is a basic example of how you can achieve this: 1. Setting up retry logic:

python
from prefect import flow, task
from prefect.tasks import task_input_hash
from datetime import timedelta

@task(retries=3, retry_delay_seconds=60)
def failing_task():
    raise ValueError("This task fails!")

@flow
def my_flow():
    failing_task()

my_flow()

2. Setting up a Slack notification: You'll need a Slack Webhook URL for notifications. Create a Slack notification block in Prefect and use it to notify on task failure. This should be done in your Prefect Cloud or Prefect Server UI: - Create a Slack Webhook Block: - Go to the Prefect UI -> Blocks -> Create a new block -> Notifications -> Slack Webhook Then, configure your flow to send notifications:

python
from prefect import flow, task
from prefect.notifications import SlackWebhook

@task(retries=3, retry_delay_seconds=60)
def failing_task():
    raise ValueError("This task fails!")

@flow
def my_flow():
    try:
        failing_task()
    except Exception as e:
        slack_webhook = SlackWebhook.load("YOUR_BLOCK_NAME")
        slack_webhook.notify("Task failed with error: " + str(e))
        raise

my_flow()

Some useful documentation links: - Prefect 2.0 Notifications - Task Retries GitHub issues and related topics: - Add ability to set up notifications from the Python API - Retry Cloning Of Remote Repository Upon Failure - Update failure notifications These references should help you set up task failure alerts in your flow using Prefect 2.x. Let me know if you need any more help!