Python Opencenus Trace ID and Span ID in azure monitor

Question

I am trying to add traceId and spanId to logs in azure functions in python, following https://learn.microsoft.com/en-us/azure/azure-monitor/app/correlation#log-correlation in Azure documentation

traceId and spanId is added to log statements in local development using VS Code but I am not able to see the same traceId and spanId in azure monitor,

I followed https://learn.microsoft.com/en-us/azure/azure-monitor/app/opencensus-python#logs section of the documentation to add AzureLogHandler but still things don't seem to work

I want to be able to query the logs in Azure Application insights using the traceId and spanId What is missing in my code so traceId and spanId is not logged in azure monitor

Below is my code to configure logs in python

  def logger_and_tracer(name):

    config_integration.trace_integrations(["logging", "requests"])
    tracer = Tracer(sampler=AlwaysOnSampler())
    formatter = logging.Formatter(
        "fileName=%(filename)s functionName=%(funcName)s traceId=%(traceId)s spanId=%(spanId)s %(message)s"
    )
    logger = logging.getLogger(name)
    azure_logger = AzureLogHandler()
    syslog = logging.StreamHandler()
    azure_logger.addFilter(CustomDimensionsFilter(default_log_items))
    syslog.addFilter(CustomDimensionsFilter(default_log_items))

    azure_logger.setFormatter(formatter)
    syslog.setFormatter(formatter)

    logger.setLevel(logging.DEBUG)

    logger.addHandler(syslog)
    logger.addHandler(azure_logger)

    return (logger, tracer)

Answer 1

Please follow the below steps to add the Trace ID and span ID in your azure function to view the value of those in Azure monitor.

Add the necessary packages of Opencenus in azure function root folder.

pip install opencensus-extension-azure-functions

pip install opencensus-ext-logging

import json
import logging

from opencensus.extension.azure.functions import OpenCensusExtension
from opencensus.trace import config_integration
from opencensus.trace.samplers import AlwaysOnSampler
from opencensus.trace.tracer import Tracer

logger = logging.getLogger('HttpTriggerLogger')
OpenCensusExtension.configure()
config_integration.trace_integrations(['logging'])
logging.basicConfig(format='%(asctime)s traceId=%(traceId)s spanId=%(spanId)s %(message)s')
tracer = Tracer(sampler=AlwaysOnSampler())
    logger = logging.getLogger(__name__)
    logger.warning('Before the span')
with tracer.span(name='hello'):
    logger.warning('In the span')
    logger.warning('After the span')
    
def main(req, context):
logger.info('Executing HttpTrigger with OpenCensus extension')

# You must use context.tracer to create spans

    with context.tracer.span("parent"):
    logger.info('Message from HttpTrigger')
    return json.dumps({
    'method': req.method,
    'ctx_func_name': context.function_name,
    'ctx_func_dir': context.function_directory,
    'ctx_invocation_id': context.invocation_id,
    'ctx_trace_context_Traceparent': context.trace_context.Traceparent,
    'ctx_trace_context_Tracestate': context.trace_context.Tracestate,
    })

I can see the metrics in Azure monitor

Refer here Doc 1 & Doc 2

OpenCensus and OpenTracing have currently merged into OpenTelemetry. You can have a look here