How to implement OpenCensus to send custom dimensions to AI in Python?

This article is contributed. See the original author and article here.

With Python application, you can use OpenCensus to send the telemetry data. However, if your requirement is to use custom dimensions, you can use as below:

 

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)

 

 

In case, your requirement is to use correlation ID with custom dimensions, Function App does not have the feature available yet. The team is working on a solution to light up this feature.

Until then, use the example below and initialize the OpenCensus component with the correlation id in your function’s trigger.

 

import json

import logging

import requests

 

import azure.functions as func

from opencensus.ext.azure.trace_exporter import AzureExporter

from opencensus.trace import config_integration

from opencensus.trace.samplers import ProbabilitySampler

from opencensus.trace.tracer import Tracer

from opencensus.trace import execution_context

from opencensus.trace.propagation.trace_context_http_header_format import TraceContextPropagator

 

config_integration.trace_integrations([‘requests’])

 

exporter = AzureExporter(instrumentation_key=”aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee”)

 

def main(req: func.HttpRequest, context: func.Context) -> func.HttpResponse:

 

    ## these below four lines

    span_context = TraceContextPropagator().from_headers({“traceparent”: context.trace_context.Traceparent, “tracestate”: context.trace_context.Tracestate})

    tracer = Tracer(span_context=span_context, exporter=exporter, sampler=ProbabilitySampler(1.0))

    execution_context.set_opencensus_tracer(tracer)  # < — sets the passed in tracer as the current tracer

 

    with tracer.span(“parent”):

        response = requests.get(url=’http://example.com‘)

    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,

    })

 

 

Hope this helps!

Shashank Ranjan

Azure App Services Support Engineering

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