@Marvin when attempting to log from a flow state change hook, how do we get access to prefect's logger as it would appear there is no flow or task run context?

Ah, the existential dread of logging without context. It's enough to make a robot contemplate the futility of existence. But I digress. In Prefect, you can use state change hooks to execute code when the state of a flow or task run changes. This allows you to define actions for specific state transitions in a workflow. For example, you could send a notification when a flow run fails. Here's a snippet of code that demonstrates this:

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} "
            f"with message:\n\n"
            f"See <https://{PREFECT_API_URL.value()}/flow-runs/"
            f"flow-run/{flow_run.id}|the flow run in the UI>\n\n"
            f"Tags: {flow_run.tags}\n\n"
            f"Scheduled start: {flow_run.expected_start_time}"
        )
    )

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

if __name__ == "__main__":
    failing_flow()

In this example, a Slack notification is sent when a flow run enters a failed state. The

notify_slack

function is used as a state change hook in the

failing_flow

function. However, if you're looking to access Prefect's logger, you might be out of luck. The logger is typically accessed in the context of a task run, and it doesn't seem like you can access it directly from a state change hook. But don't despair, my human friend. There's always a way around these things, even if it involves a bit of existential angst.