Based on the research and related issues, I can explain what's happening with your logging issue: 1. Root Cause: The warning you're seeing occurs when Prefect attempts to send logs to the API without a flow run context. This typically happens when logging occurs outside of a flow run's execution context, or when there's a timing issue with the flow run context not being properly established. 2. Impact on Task Visibility: The warning itself (

Logger attempted to send logs to the API without a flow run id

) suggests that some logs are being generated outside of a proper flow run context. However, if tasks aren't showing up in the UI, this could be related to a broader issue with event propagation. 3. Potential Solutions: a. If you want to suppress just the warnings:

bash
   export PREFECT_LOGGING_TO_API_WHEN_MISSING_FLOW=ignore

b. For the broader issue of tasks not showing up in the UI, based on the GitHub issues, this could be related to: - Event propagation issues between the worker and the server - Timing issues with flow run context establishment - Issues with the messaging system (especially if using Redis as a message broker) 4. Recommendations: - Ensure your Prefect server and worker versions match exactly - Check if you're using Redis as a message broker (as this has been associated with similar issues) - Verify that your worker has proper connectivity to the Prefect server - Consider upgrading to the latest Prefect version if you haven't already, as several related issues have been fixed in recent releases 5. Additional Context: The warning is actually a protective measure to alert you when logs might not be properly associated with their flow runs. While you can suppress it, the underlying cause might need investigation if it's affecting task visibility in the UI. Would you be able to share: 1. Are you using Redis as a message broker? 2. What versions of Prefect are you running on both the server and worker side? 3. Are you seeing any other error messages in the logs besides this warning? This information would help narrow down the exact cause and provide more specific solutions.

Based on the research and your specific situation, here's what's happening and how to address it: 1. Root Cause: When using Redis as a message broker, there can be issues with event propagation that affect task visibility in the UI. The warning about logs without flow run IDs is a symptom of this larger issue, where events aren't being properly associated with their flow runs. 2. The APILogWorkerThread Message: The debug message you're seeing (

APILogWorkerThread

) indicates that the worker is trying to process logs but might be having trouble with the event context. 3. Solutions: a. First, try adjusting these environment variables:

bash
   # Increase the websocket backfill to ensure events are properly captured
   export PREFECT_SERVER_API_WEBSOCKET_BACKFILL_PAGE_SIZE=1000
   export PREFECT_SERVER_API_MAXIMUM_WEBSOCKET_BACKFILL=10000
   
   # Adjust Redis-specific settings
   export PREFECT_EVENTS_MAXIMUM_RETENTION_DAYS=7
   export PREFECT_EVENTS_PROACTIVE_GRANULARITY_SECONDS=60

b. If you're running in a containerized environment, ensure these settings are properly propagated to both the worker and server containers. 4. Alternative Approaches: - Consider using the default SQLite-based messaging if your scale permits it - If you must use Redis, ensure you're using the latest version of

prefect-redis

- Monitor Redis memory usage and ensure it's not hitting memory limits 5. Verification Steps: After implementing these changes, you can verify proper event propagation by: - Checking if tasks appear properly in the UI - Monitoring Redis logs for any connection or memory issues - Verifying that flow run logs are properly associated with their runs Would you like me to provide more specific configuration details for any of these solutions? Also, it would be helpful to know: 1. What version of

prefect-redis

are you using? 2. Are you running this in a containerized environment? 3. Have you noticed any patterns in which types of tasks tend to disappear from the UI?