Yes. In Prefect 3.x you can route standard library (and third‑party) loggers to the Prefect UI. What to do: - Set the

PREFECT_LOGGING_EXTRA_LOGGERS

environment variable to a comma‑separated list of logger names you want captured. For example: -

myapp

to capture logs from

logging.getLogger(__name__)

in your helper package -

urllib3,botocore,boto3

to capture AWS SDK noise - In ECS/Fargate, set this env var in your task definition, your ECS work pool’s environment, or your deployment’s environment so it’s present in the running task. Example: - Helper code

# myapp/helpers.py
import logging

logger = logging.getLogger(__name__)

def do_something():
    <http://logger.info|logger.info>("hello from helper")

- Flow code

from prefect import flow

@flow
def my_flow():
    from myapp.helpers import do_something
    do_something()

if __name__ == "__main__":
    my_flow()

- Environment variables (in your ECS task/work pool/deployment)

PREFECT_LOGGING_EXTRA_LOGGERS=myapp,urllib3,botocore
PREFECT_LOGGING_LEVEL=INFO

Notes and gotchas: - Logs are only associated with a run if they’re emitted while a flow/task is active. If a library logs at import time before the run starts, those may not appear in the UI. - Some libraries set

propagate = False

or attach their own handlers. If you still don’t see logs after setting

PREFECT_LOGGING_EXTRA_LOGGERS

, you can force‑attach Prefect’s handler:

import logging
from prefect.logging.handlers import APILogHandler

logger = logging.getLogger("myapp")
logger.addHandler(APILogHandler())
logger.setLevel("INFO")
logger.propagate = True

- To capture

print()

output in the UI as logs, set:

PREFECT_LOGGING_LOG_PRINTS=true

- For advanced control, you can provide a full logging config file and set

PREFECT_LOGGING_SETTINGS_PATH

to it. Docs: - Advanced logging customization - How to add logging to flows and tasks - APILogHandler reference - Settings reference (see

PREFECT_LOGGING_EXTRA_LOGGERS

,

PREFECT_LOGGING_LOG_PRINTS

) If you share the logger names or libraries you’re using, I can suggest a concrete

PREFECT_LOGGING_EXTRA_LOGGERS

value for your ECS tasks.