Python log_struct output appears as JSON {"message":"Log struct"} in the logs viewer?

[John Carter]

I'm trying to get structured logging working from a Python 3.7 Google Cloud Function, using google-cloud-logging log_struct, while still retaining the useful information attached to print() logs like display of function_name, execution_id etc.

I've nearly got it working, but I'm finding that if I use the logger name "cloudfunctions.googleapis.com%2Fcloud-functions" as per the default logs then my message appears in the Stackdriver logs viewer web page as a JSON dict instead of just showing the message.

If use a different logger name then message is shown correctly, but then the function name and execution id aren't shown in the log view by default.

Is there a way to configure it so both are shown?

I can fake the result I want by using a different log name and editing the custom fields in the Stackdriver logs viewer, but that's annoying to have to do, and seems redundant.

Cloud function that produced the above:

def hello_world(request: "flask.Request"):
    from google.cloud import logging as cloud_logging
    from google.cloud.logging.resource import Resource
    client = cloud_logging.Client()

    print("Example print")

    for logger_name in ("cloudfunctions.googleapis.com%2Fcloud-functions", "my-logs"):
        # Setting logger name = "cloudfunctions.googleapis.com%2Fcloud-functions" seems to
        # causes the log struct to show as a JSON string instead of showing the message?

        google_logger = client.logger(logger_name)

        # see https://stackoverflow.com/questions/54660919/how-to-logging-with-different-severity-levels-in-google-cloud-functions/54673381#54673381
        execution_id = request.headers.get("Function-Execution-Id")
        function_name = os.environ.get("FUNCTION_NAME")
        function_region = os.environ.get("FUNCTION_REGION")
        project_name = os.environ.get("X_GOOGLE_GCLOUD_PROJECT")
        trace, sep, end = request.headers.get("X-Cloud-Trace-Context", "").partition("/")
        if trace:
            trace = f"projects/{project_name}/traces/{trace}"

        google_logger.log_struct(
            {"message": "Log struct"},
            labels={"execution_id": execution_id},
            resource=Resource(type="cloud_function", labels={"function_name": function_name, "region": function_region}),
            severity="WARNING",
            trace=trace
        )

    return "done"