Short answer: Not by default. In Prefect 3.x, only logs emitted via

prefect.logging.get_run_logger()

(inside a running flow/task) are automatically sent to the Prefect API and shown in the UI. Plain

logging.getLogger(...)

won’t reach the UI unless you configure Prefect to capture those loggers or attach Prefect’s API log handler yourself. What to use: - Inside flows/tasks, prefer `get_run_logger()`:

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

@task
def do_work():
    logger = get_run_logger()
    <http://logger.info|logger.info>("This will appear in the Prefect UI")

@flow(log_prints=True)  # optional: capture print() as logs
def my_flow():
    do_work()
    print("This will also appear in the UI because log_prints=True")

if __name__ == "__main__":
    my_flow()

If you need to capture native/third‑party loggers: - Enable extra loggers via settings (so they’re wired to the API handler):

export PREFECT_LOGGING_EXTRA_LOGGERS="myapp,urllib3"

- Or manually attach Prefect’s API log handler:

import logging
from prefect.logging.handlers import APILogHandler

logger = logging.getLogger("myapp")
logger.setLevel(<http://logging.INFO|logging.INFO>)
logger.addHandler(APILogHandler())  # will send logs to the Prefect API when a run context is active

Notes: -

print()

is not logged unless you set

log_prints=True

on the `@flow`/`@task` decorator. -

prefect.logging.get_logger()

returns a standard logger with Prefect formatting, but it won’t send to the API unless you attach

APILogHandler

or include it in

PREFECT_LOGGING_EXTRA_LOGGERS

. Docs: - Add logging to flows and tasks - Advanced logging customization - prefect.logging.loggers API - prefect.logging.handlers API