Adding Custom Dimension to Request Telemetry - Azure functions

问题

I am creating a new Function app using v2.x and I am integrating Application Insights for request logging that is automatically being done as Azure Function is now integrated with App Insights (as mentioned in the documentation link). What I would need to do is log few custom fields in the custom dimensions in Application Insights Request Telemetry. Is it possible without using Custom Request logging (using TrackRequest method)

回答1:

About adding custom properties, you could refer to this tutorial:Add properties: ITelemetryInitializer. The below is my test a HTTP trigger function.

public static class Function1
{
    private static string key = "Your InstrumentationKey";
    private static TelemetryClient telemetry = new TelemetryClient() { InstrumentationKey = key };
    [FunctionName("Function1")]
    public static async Task<IActionResult> Run(
        [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
        ILogger log)
    {
        log.LogInformation("C# HTTP trigger function processed a request.");

        if (!telemetry.Context.Properties.ContainsKey("Function_appName"))
        {
            telemetry.Context.Properties.Add("Function_appName", "testfunc");
        }
        else
        {
            telemetry.Context.Properties["Function_appName"] = "testfunc";
        }

        telemetry.TrackEvent("eventtest");
        telemetry.TrackTrace("tracetest");

        string name = req.Query["name"];

        string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
        dynamic data = JsonConvert.DeserializeObject(requestBody);
        name = name ?? data?.name;

        return name != null
            ? (ActionResult)new OkObjectResult($"Hello, {name}")
            : new BadRequestObjectResult("Please pass a name on the query string or in the request body");
    }
}

After running this function, go to the Application Insights Search could check the data Or go to Logs(Analytics).

Update:

回答2:

You should use ITelemetry Initializer(which can add custom dimension to a specified telemetry like only for request) in function app, please follow the steps below(Please note that run the function app from azure portal, not local):

1.In Visual studio, create a function app(In my test, I create a blob triggerd function), and install the following nuget packages:

Microsoft.ApplicationInsights, version 2.10.0

Microsoft.NET.Sdk.Functions, version 1.0.29

2.Then in the Function1.cs, write code like below:

using Microsoft.ApplicationInsights.Channel;
using Microsoft.ApplicationInsights.DataContracts;
using Microsoft.ApplicationInsights.Extensibility;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using System.IO;

[assembly: WebJobsStartup(typeof(FunctionApp21.MyStartup))]
namespace FunctionApp21
{
    public static class Function1
    {


        [FunctionName("Function1")]
        public static void Run([BlobTrigger("samples-workitems/{name}", Connection = "AzureWebJobsStorage")]Stream myBlob, string name, ILogger log)
        {
            log.LogInformation($"C# Blob trigger function Processed blob\n Name:{name} \n Size: {myBlob.Length} Bytes");
        }
    }

    internal class MyTelemetryInitializer : ITelemetryInitializer
    {
        public void Initialize(ITelemetry telemetry)
        {           

            //use telemetry is RequestTelemetry to make sure only add to request
            if (telemetry != null && telemetry is RequestTelemetry && !telemetry.Context.GlobalProperties.ContainsKey("my_custom_dimen22"))
            {
                telemetry.Context.GlobalProperties.Add("my_custom_dimen22", "Hello, this is custom dimension for request!!!");
            }
        }
    }

    public class MyStartup : IWebJobsStartup
    {
        public void Configure(IWebJobsBuilder builder)
        {
            builder.Services.AddSingleton<ITelemetryInitializer, MyTelemetryInitializer>();

        }
    }
}

3.Publish it to azure, then nav to azure portal -> the published function app -> Monitor -> Add an application insights.

4.Run the function from azure. And wait for a few minutes -> nav to the application insights portal, check the telemetry data, and you can see the custom dimension is only added to request telemetry:

来源：https://stackoverflow.com/questions/57073603/adding-custom-dimension-to-request-telemetry-azure-functions