@Marvin Is there a way to view logs from a task called with the on_failure hook within the flow that called it?

You can view the logs generated by tasks, including those executed with

on_failure

hooks, within the Prefect Flow that called them. Here are some useful resources: ### Prefect 2.x 1. Viewing Logs in Prefect UI: You can see logs for a flow run in the Prefect UI by navigating to the Flow Runs page and selecting a specific flow run to inspect. This will include logs for task runs as well. Link: Prefect 2.x Logging Guide 2. Using State Change Hooks: State change hooks execute code in response to changes in flow or task run states. You can use state change hooks to handle specific state transitions, such as logging failures. Code Example:

python
   from prefect import flow
   from prefect.blocks.core import Block
   from prefect.settings import PREFECT_API_URL

   def notify_slack(flow, flow_run, state):
       slack_webhook_block = Block.load("slack-webhook/my-slack-webhook")
       slack_webhook_block.notify(f"Your job {flow_run.name} entered {state.name} with message: See the flow run in the UI: {PREFECT_API_URL.value()}/flow-runs/flow-run/{flow_run.id}")

   @flow(on_failure=[notify_slack], retries=1)
   def failing_flow():
       raise ValueError("oops!")

   if __name__ == "__main__":
       failing_flow()

Link: State Change Hooks in Prefect 2.x ### Prefect 3.x 1. Logging Configuration: By default, task runs and nested flow runs inherit the

log_prints

setting from their parent flow run. You can customize logging behavior to ensure that logs are captured correctly. Code Example:

python
   from prefect import task, flow

   @task
   def my_task():
       print("we're logging print statements from a task")

   @flow(log_prints=True)
   def my_flow():
       print("we're logging print statements from a flow")
       my_task()

   my_flow()

Link: Logging in Prefect 3.x 2. Using State Change Hooks: Similar to Prefect 2.x, Prefect 3.x also allows you to use state change hooks to handle task or flow state transitions. Code Example:

python
   from prefect import flow
   from prefect.blocks.core import Block
   from prefect.settings import PREFECT_API_URL

   def notify_slack(flow, flow_run, state):
       slack_webhook_block = Block.load("slack-webhook/my-slack-webhook")
       slack_webhook_block.notify(f"Your job {flow_run.name} entered {state.name}")

   @flow(on_failure=[notify_slack], retries=1)
   def failing_flow():
       raise ValueError("oops!")

   if __name__ == "__main__":
       failing_flow()

Link: State Management in Prefect 3.x These resources should help you configure your Prefect flows to capture and view logs from tasks that have failed and triggered

on_failure

hooks.