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Simplify observability .NET with OpenTelemetry Collector

Kim CH on April 25, 2023

[Updated 20 July, 2024] I've updated to .NET 8 & changes regarding otel collector Overview The Observability concept b...

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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.