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Simplify observability .NET with OpenTelemetry Collector

Kim CH on April 25, 2023

Overview The Observability concept become the standard of almost system in recently. It helps team to troubleshoot what's happening insi...

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Sunil • Sep 24 '23 • Edited

Thank you for the well written article. However I am using an issue with Logging.

I am using Serilog in .Net Framework 4.8 to send logs to Opentelemetry. I am using Elastic as OpenTelemetry backend . I am able to send traces and but not logs. Please find my below code where it writes the log to the file but not sending logs to opentelemetry. Can somebody help?

    // TRACES ----- WORKING 
    _tracerProvider = Sdk.CreateTracerProviderBuilder()
   .AddAspNetInstrumentation()
   .AddHttpClientInstrumentation()
   .AddOtlpExporter(config =>
   {
       config.Endpoint = new Uri("https://abcd.es.io:443");
       config.Headers = "Authorization=ApiKey xyz";
   })
   .AddSource("SK")
   .SetResourceBuilder(
       ResourceBuilder.CreateDefault()
           .AddService(serviceName: "NLogger", serviceVersion: "1.0.0")
           .AddAttributes(resourceAttributes))
   .Build();

   var endpoint = "https://abcd.es.io:443/v1/logs";
   var protocol = OtlpProtocol.HttpProtobuf;

   // LOGGING --- NOT WORKING
   Log.Logger = new LoggerConfiguration()
   .MinimumLevel.Error()
   .WriteTo.Console()
   .WriteTo.File(@"c:\tt\1.txt")
   .WriteTo.OpenTelemetry(
   options => {
        options.Endpoint = endpoint;
        options.Protocol = protocol;
        options.IncludedData =
                IncludedData.SpanIdField
                | IncludedData.TraceIdField
                | IncludedData.MessageTemplateTextAttribute
                | IncludedData.MessageTemplateMD5HashAttribute;
        options.ResourceAttributes = new Dictionary<string, object>
        {
            ["service.name"] = "NLogger",
            ["index"] = 10,
            ["flag"] = true,
            ["pi"] = 3.14
         };
         options.Headers = new Dictionary<string, string>
         {
            ["Authorization"] = "Basic xyz", // user:abc123
         };
         options.BatchingOptions.BatchSizeLimit = 2;
         options.BatchingOptions.Period = TimeSpan.FromSeconds(2);
         options.BatchingOptions.QueueLimit = 10;
     })
     .CreateLogger();

I tried "ApiKey" instead of "Basic" in the authorization header, but still it doesn't work. It writes the log successfully to the text file though. Please help.

Followed this page github.com/serilog/serilog-sinks-o... as reference.