Short answer: tasks are still being tracked in Prefect 3.x, but the UI now focuses on flow runs and, depending on your version/setup, you may not see a dedicated task-runs listing in the UI. A few common reasons: - You recently upgraded to Prefect 3.x: the new UI de‑emphasizes task runs; visibility is primarily via flow-run logs. Task runs are still created and queryable. - The flow run is still Pending: many UIs don’t render task details until the flow actually starts running. - You’re using a distributed task runner (e.g., Dask) with `.submit()`: there’s a known issue where task runs may not appear in the UI in some 3.6.x builds. See Prefect UI cannot see tasks with DaskTaskRunner. What you can do right now: - Check task runs from the CLI

prefect task-run ls --limit 50
  prefect task-run ls --state-type RUNNING
  prefect task-run inspect <TASK_RUN_ID>
  prefect task-run logs <TASK_RUN_ID>

- Confirm tasks are emitting logs inside the flow (these always show in the flow-run Logs view)

from prefect import flow, task
  from prefect.logging import get_run_logger

  @task
  def my_task():
      logger = get_run_logger()
      <http://logger.info|logger.info>("hello from my_task")
      return 1

  @flow
  def my_flow():
      my_task.submit()  # or my_task()

- If you’re on a distributed runner (Dask/Ray), upgrade to the latest Prefect 3.6.x and the latest integration package (e.g., prefect-dask), then re-test. The linked issue above tracks fixes/workarounds. Could you share: - Your Prefect version (run

prefect version

) - Cloud vs self-hosted Server - Whether you’re using Dask/Ray (and versions) - A screenshot or description of where in the UI you used to see task runs With that, I can confirm whether you’re hitting a version-specific UI change or a known bug and suggest the best path forward.

You’re right—thanks for the correction. The latest Prefect 3.x UI does provide stronger visibility for task runs. Where to find task runs in the UI: - Runs page: switch to the Task Runs view to see task runs across your workspace. - Flow run details: open a flow run and select the Task Runs tab to see just that run’s tasks. If you still don’t see them: - Clear filters on the Runs/Task Runs view (state, tags, date range, etc.). - Make sure the flow has actually started (Pending flow runs won’t show task activity yet). - If you’re using a distributed runner (e.g., Dask) and calling

.submit()

, there’s a known issue in some 3.6.x builds where tasks may not appear in the UI. See Prefect UI cannot see tasks with DaskTaskRunner. Upgrading Prefect and the integration (e.g., prefect-dask) usually resolves it. Quick CLI checks (verified):

prefect task-run ls --limit 50
prefect task-run inspect <TASK_RUN_ID>
prefect task-run logs <TASK_RUN_ID>

If you share: - Your Prefect version (

prefect version

) - Cloud vs self-hosted - Whether you’re using Dask/Ray (and versions) …I can pinpoint why they weren’t showing for you and suggest the exact fix.