Azure Functions for python, structured logging to Application Insights?

Question

When using Python (3.8) in Azure Functions, is there a way to send structured logs to Application Insights? More specifically, I'm trying to send custom dimensions with a log message. All I could find about logging is this very brief section.

Answer 1

Update 0127:

It's solved as per this github issue. And here is the sample code:

# Change Instrumentation Key and Ingestion Endpoint before you run this function app

import logging

import azure.functions as func
from opencensus.ext.azure.log_exporter import AzureLogHandler

logger_opencensus = logging.getLogger('opencensus')
logger_opencensus.addHandler(
    AzureLogHandler(
        connection_string='InstrumentationKey=aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee;IngestionEndpoint=https://eastus-6.in.applicationinsights.azure.com/'
    )
)

def main(req: func.HttpRequest) -> func.HttpResponse:
    properties = {
        'custom_dimensions': {
            'key_1': 'value_1',
            'key_2': 'value_2'
        }
    }

    logger_opencensus.info('logger_opencensus.info Custom Dimension', extra=properties)
    logger_opencensus.info('logger_opencensus.info Statement')
    return func.HttpResponse("OK")

---

Please try OpenCensus Python SDK.

The example code is in the Logs section, step 5:

Description: You can also add custom properties to your log messages in the extra keyword argument by using the custom_dimensions field. These properties appear as key-value pairs in customDimensions in Azure Monitor.

The sample:

import logging

from opencensus.ext.azure.log_exporter import AzureLogHandler

logger = logging.getLogger(__name__)
# TODO: replace the all-zero GUID with your instrumentation key.
logger.addHandler(AzureLogHandler(
    connection_string='InstrumentationKey=00000000-0000-0000-0000-000000000000')
)

properties = {'custom_dimensions': {'key_1': 'value_1', 'key_2': 'value_2'}}

# Use properties in logging statements
logger.warning('action', extra=properties)