Does anyone here have any experience using Prefect with Logfire? I am trying to figure out how to get Prefect to capture my Logfire logs.

cc’ing @Alexander Azzam

I have. Logfire isn't really a traditional logger, and from what I can tell doesn't have a logger name like most loggers do. I tried adding

logfire

to the extra loggers but that didn't work.

right but logfire does integrate with standard loggers, which is what prefect loggers are based on. so its not actually extra loggers in this case instead this should mostly be about writing a custom

logging.yaml

file and then setting that with

PREFECT_LOGGING_CONFIG_PATH

for example

import logfire
from prefect import flow
from prefect.logging import get_run_logger

# Initialize Logfire first
logfire.configure()


@flow
def log_flow():
    logger = get_run_logger()
    logger.error("Damnit, Marvin!")


if __name__ == "__main__":
    log_flow()

» PREFECT_LOGGING_CONFIG_PATH=logging.yaml python main.py
Logfire project URL: <https://logfire.pydantic.dev/zzstoatzz/marvin>
13:52:17.188 | INFO    | prefect.engine - Created flow run 'cheerful-doberman' for flow 'log-flow'
18:52:17.414 Damnit, Marvin!
13:52:17.410 | ERROR   | Flow run 'cheerful-doberman' - Damnit, Marvin!
18:52:17.593 Finished in state Completed()
13:52:17.591 | INFO    | Flow run 'cheerful-doberman' - Finished in state Completed()

where I added the following

handlers:
...

  # Add Logfire handler
  logfire:
    level: 0
    class: logfire.LogfireLoggingHandler
    formatter: standard

loggers:
  prefect:
    level: "${PREFECT_LOGGING_LEVEL}"

...

  prefect.flow_runs:
    level: NOTSET
    handlers: [api, logfire] # Added logfire

  prefect.task_runs:
    level: NOTSET
    handlers: [api, logfire] # Added logfire

Okay thanks I will look at this!