Short answer: No—Prefect 3.x still sends

get_run_logger()

logs to the API by default. You do not have to explicitly enable it. In Prefect 3.x, API logging is controlled by the

logging.to_api

settings and is enabled by default: - Profile key:

logging.to_api.enabled

(default: true) - Env var:

PREFECT_LOGGING_TO_API_ENABLED=true

How to verify quickly: - Show your current config (and defaults)

prefect config view --show-defaults

Look for:

logging.to_api.enabled = true

- If it’s false, enable it:

prefect config set logging.to_api.enabled=true

Or via env var:

export PREFECT_LOGGING_TO_API_ENABLED=true

Other settings you can tune (all have env var equivalents): -

logging.to_api.batch_interval

→

PREFECT_LOGGING_TO_API_BATCH_INTERVAL

(default 2.0s) -

logging.to_api.batch_size

→

PREFECT_LOGGING_TO_API_BATCH_SIZE

-

logging.to_api.max_log_size

→

PREFECT_LOGGING_TO_API_MAX_LOG_SIZE

-

logging.to_api.when_missing_flow

→

PREFECT_LOGGING_TO_API_WHEN_MISSING_FLOW

(default

warn

) If logs still aren’t appearing, check these common gotchas: - Make sure you’re calling

get_run_logger()

inside a running flow or task. Outside a run context, logs won’t be associated with a flow run. - Ensure your process doesn’t exit before logs flush. Logs are batched; if you have very short-lived runs, try lowering the batch interval:

prefect config set logging.to_api.batch_interval=0.2

- Confirm you’re pointed at a Prefect 3-compatible API (Prefect Cloud or a Prefect 3 server) and that your

PREFECT_API_URL

and any auth are set. - Check you aren’t overriding Prefect’s logging with a custom logging config that removes the API handler. Look for

logging.config_path

in

prefect config view

. Docs for details: - Logging in flows/tasks and `get_run_logger()`: Prefect 3 API: loggers - Logging to the API settings: Settings reference and Logging customization - Handlers (including API log handler): Logging handlers If you can share: -

prefect version

-

prefect config view --hide-defaults

- Whether you’re on Prefect Cloud or a self-hosted server (and its version) I can pinpoint why the logs aren’t making it to the API in your environment.