Got it — when task runs don’t show up only on your self‑hosted ECS server (but do locally), it’s almost always one of these: - The server loop services that record task runs aren’t running in ECS - The UI or flows are pointed at the wrong API URL - The server/database version/migrations are out of sync Assuming you’re on Prefect 3.x; if you’re on 2.x let me know and I’ll adjust. Quick checks to run inside your ECS server container - Verify Prefect and that services are enabled

prefect version
  prefect server services list-services

You should see services like scheduler, event_persister, event_logger, and task_run_recorder. If they’re disabled or not listed, your server is likely running without services. - If you started the API without services (e.g., via uvicorn or with --no-services), either: - Start the monolithic server (web + services):

prefect server start

Make sure you are NOT using the

--no-services

flag. - Or, if you must run the API separately, start the loop services in a separate process/sidecar:

prefect server services start

Critical environment variables - Ensure these are set in your server container (they’re enabled by default, but can be disabled by env): -

PREFECT_API_SERVICES_TASK_RUN_RECORDER_ENABLED=true

-

PREFECT_API_SERVICES_EVENT_PERSISTER_ENABLED=true

-

PREFECT_API_SERVICES_EVENT_LOGGER_ENABLED=true

- If you’re toggling others, also keep

PREFECT_API_SERVICES_SCHEDULER_ENABLED=true

- Ensure the UI points to the correct API: -

PREFECT_UI_API_URL=<https://your-api-domain>

(whatever your ECS API is) - Ensure flows/workers can report to your API: -

PREFECT_API_URL=<https://your-api-domain>

inside your worker and flow containers Database migrations - If you upgraded Prefect in ECS, run the DB migrations once:

prefect server database upgrade

A schema mismatch can prevent new entities from being recorded cleanly. What I’d like to confirm - Do flow runs appear in the UI and only the task runs are missing, or are both missing? - How are you starting the server in ECS (e.g.,

prefect server start

, a custom

uvicorn

command, or with

--no-services

)? - What are the values of

PREFECT_API_URL

(in your worker/flow containers) and

PREFECT_UI_API_URL

(in your UI container)? - Output of

prefect server services list-services

from the ECS server container References - Prefect 3 settings reference (includes server/UI/services env vars): Settings reference Once you share those details, I can help pinpoint exactly which toggle or process needs to be fixed.