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?

CodePudding user response：

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:

Query Traces:

CodePudding user response：

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

CodePudding user response：

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

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.