Question 104278 in Azure Question posted in
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Writing custom trace messages to Application Insight from Azure Function App

I working on Azure Function App and would like to adding custom messages/traces which can aid in debugging and improving performance. THis is my code I am using:

var telemetry = new Microsoft.ApplicationInsights.TelemetryClient();
telemetry.TrackTrace("Alert Button Pressed by Device ->"+CloudObject.A, SeverityLevel.Warning,new Dictionary<string, string> { { "IoT Object", IOTMESSAGE } });

But when I go to Application Insight and Query traces(All) I do not see trace message I am setting.

Am I doing something wrong?

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3

Answers


  1. Chosen as BEST ANSWER
    0

    It still not working. I am getting this warning, could this be an issue?

    I have set a sampling and data ap on application insight, I am hoping custom trace messages ignore those set limits

    enter image description here


  2. 0

    I have reproduced with the same code and got the expected results as below:

     [FunctionName("Function1")]
        public static async Task<HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)]HttpRequestMessage req, TraceWriter log)
        {
            log.Info("C# HTTP trigger function processed a request.");
            string name = req.GetQueryNameValuePairs()
                .FirstOrDefault(q => string.Compare(q.Key, "name", true) == 0)
                .Value;
            var telemetry = new TelemetryClient();
            telemetry.TrackEvent("Loading HomeController-Index View");          
            telemetry.TrackTrace("Alert Button Pressed by Device ->" + CloudObject.A, SeverityLevel.Warning, new Dictionary<string, string> { { "IoT Object", IOTMESSAGE } });
            if (name == null)
            {
                // Get request body
                dynamic data = await req.Content.ReadAsAsync<object>();
                name = data?.name;
            }

            return name == null
                ? req.CreateResponse(HttpStatusCode.BadRequest, "Please pass a name on the query string or in the request body")
                : req.CreateResponse(HttpStatusCode.OK, "Hello " + name);
        }

    Application Insights:

    https://i.imgur.com/vWEqPNu.png

    Query Traces:

    enter image description here

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  3. 0

    You shoud not instantiate TelemetryClient using the parameterless constructor. Use dependency injection instead.

    1. Make sure you have added the Microsoft.Azure.WebJobs.Logging.ApplicationInsights NuGet package
    2. Make sure the instrumentation key is set (APPINSIGHTS_INSTRUMENTATIONKEY)
    3. Create an instance in the constructor of the function, for example:
           public HttpTrigger2(TelemetryConfiguration telemetryConfiguration)
       {
           this.telemetryClient = new TelemetryClient(telemetryConfiguration);
       }

    When 1 and 2 are done you could also use the ILogger interface to create traces telemetry in application insights. You can inject a logger like this:

            [FunctionName("HttpTrigger2")]
        public Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = null)]
            HttpRequest req, ExecutionContext context, ILogger log)
        {
            log.LogInformation("C# HTTP trigger function processed a request.");
            [..]
        }

    Please read this section in the docs carefully.

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