Azure Durable Function Distributed Tracing, How to hide Storage related tasks

Question

Is there a way to hide the microsft table activity when viewing the full length of the distributed trace...

If I have dozens of sub activities and orchestrations, having this additional noise is really going to get cluttered.

I've tried adding Warning level rules in logging, but no effect?

hosts.json

{
  "version": "2.0",
  "telemetryMode": "OpenTelemetry",
  "logging": {
    "logLevel": {
      "default": "Warning",
      "DurableTask.AzureStorage": "Warning",
      "DurableTask.Core": "Warning",
      "Microsoft": "Warning",
      "Host.Triggers.DurableTask": "Information",
      "Function": "Information",
      "Function.http_trigger_2": "Warning",
      "Function.say_hello": "Warning"
    }
  },
  "extensions": {
     "durableTask": {
       "tracing": {
         "distributedTracingEnabled": true,
         "version": "V2"
       }
     }
  },
  "extensionBundle": {
    "id": "Microsoft.Azure.Functions.ExtensionBundle",
    "version": "[4.*, 5.0.0)"
  }
}

Filter out DurableTask.AzureStorage table storage activity using custom ITelemetryProcessor. — Pravallika KV
– Pravallika KV, Commented May 21 at 11:57

Pravallika KV · Accepted Answer · 2025-06-04 05:47:27Z

0

Below host.json affects log verbose but not the opentelemetry logs.

"logging": {
  "logLevel": {
    "DurableTask.AzureStorage": "Warning"
  }
}

Implement a TelemetryProcessor to hide storage spans as shown below:

Create a custom TelemetryProcessor class in the function project.

public  class  DurableStorage : ITelemetryProcessor 
{ 
    private ITelemetryProcessor Next { get; } 
    public  DurableStorage(ITelemetryProcessor next)
    {
        Next = next;
    } 
    public  void  Process(ITelemetry item)
    { 
        { if (dep.Type == "Azure table" && dep.Name.Contains("DurableTask"))
            { return;  
            } 
            if (dep.Data != null && dep.Data.Contains("DurableTask"))
            { return; 
            }
        }

        Next.Process(item);
    }
}

Register the TelemetryProcessor in program.cs:

var builder = FunctionsApplication.CreateBuilder(args);

builder.ConfigureFunctionsWebApplication();

builder.Services
  .AddApplicationInsightsTelemetryWorkerService();
   .ConfigureFunctionsApplicationInsights();
builder.Services.AddOptions<KestrelServerOptions>()
.Configure<IConfiguration>((settings, configuration) =>
{
    settings.AllowSynchronousIO = true;
});

builder.Services.AddSingleton<ITelemetryProcessorFactory, FilterProcessorFactory>();

builder.Build().Run();

This will filter DependencyTelemetry with type Azure table Name or Data that contains"DurableTask".

You can use below Python Code Snippet to achieve the same:

from opencensus.ext.azure.trace_exporter import AzureExporter
from opencensus.trace.samplers import ProbabilitySampler
from opencensus.trace.tracer import Tracer
from opencensus.trace import execution_context

def telemetry_processor(envelope):

    if envelope.name == "RemoteDependency" and "Table" in envelope.data.get("baseData", {}).get("type", ""):
        return False 
    return True  # Allow all other telemetry

exporter = AzureExporter(connection_string="InstrumentationKey=YOUR_KEY")
exporter.add_telemetry_processor(telemetry_processor)

tracer = Tracer(exporter=exporter, sampler=ProbabilitySampler(1.0))
execution_context.set_opencensus_attr("tracer", tracer)

edited Jun 4 at 5:47

answered May 21 at 12:29

Pravallika KV

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2 Comments

Ryu S. May 21 at 23:58

is this only possible in a .NET C# function, for a python / typescript / powershell function is it easy to implement a new telemetry processor?

Pravallika KV Jun 4 at 5:48

I have provided the Python code to achieve your requirement in the updated answer. Please check if it helps.

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