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To obtain logs associated with a flow_run within an

on_completion

hook and persist them to external storage, you have a few steps to follow. Unfortunately, there isn't a direct code snippet for this in the documentation, but we can piece together some information. - Collecting Logs: Prefect automatically collects logs during flow and task runs. The documentation here suggests these logs can be accessed via the Prefect UI or Prefect Cloud, or through the API, implying that you might use Prefect's API to programmatically retrieve logs. -

on_completion

Hook: This is a flow-level state handler designed to execute some function after a flow completes. The documentation doesn't provide a direct way to retrieve logs from this hook in the snippets I located, suggesting that the functionality might need to be built by leveraging Prefect's logging API and possibly some custom logic to fetch the logs. - Persisting to External Storage: For persisting the logs, you would likely have to write a function within the

on_completion

hook to send the logs to your desired storage solution (be it a database, file storage service, etc.). This would involve using the appropriate SDK or API for that storage service within your hook function. If you're looking to fetch the logs within an

on_completion

hook in a flow, it seems you would need to combine these methods manually. You may write a custom function that utilizes the Prefect logging API to retrieve logs and then invokes the necessary code to store those logs into your external storage system. Since the particulars on how to implement this are not directly available in the doc snippets I found, you might consider searching for or requesting more specific guidance on Prefect's GitHub issues or forums. If you need further assistance or have more detailed questions, feel free to ask!