ExecuteAsync returned.

Nothing logged it. /health still says Healthy.

naive worker — one catch (OperationCanceledException) around the loop 4 polls, then nothing

call timed out → ExecuteAsync returned

supervised worker — exception filter on the stopping token, restart with backoff 27 polls · back at work ~7 s after its last poll

restart ×2, with backoff

GET /health

200 Healthy

Every response, for the whole run. A health report only aggregates the checks you registered, and none of them know hosted services exist.

GET /health/workers

503 Unhealthy

naive: ExecuteAsync returned — one check that reads BackgroundService.ExecuteTask, catching it on the next probe, about 4 s into the run.

ExecuteAsync throwsStopHost by default — and exit code 0

ExecuteAsync returnsno log at all, host runs on

new in .NET 10even a throw before the first await is quiet

gdhami.net