CODEWITHSUNDEEP
azure-application-insightsserilogazure-monitorserilog-aspnetcoreserilog-sinks-opentelemetry
mrk
mrk

Reputation: 81

How to send logs to Application Insights with Serilog and Azure Monitor OpenTelemetry?

I want to see my ASP.NET Core application's logs in Application Insights.

I'm using the following packages:

This is the current setup:

builder.Services.AddOpenTelemetry()
    .UseAzureMonitor()
    .ConfigureResource(x =>
    {
        x.AddAttributes(new Dictionary<string, object> { { "service.name", "my-service" } });
    })
    .WithTracing();

builder.Services.AddSerilog((services, lc) => lc
    .ReadFrom.Configuration(builder.Configuration)
    .ReadFrom.Services(services)
    .Enrich.FromLogContext()
    .WriteTo.Console(builder.Environment.IsDevelopment()
        ? new RenderedCompactJsonFormatter()
        : new CompactJsonFormatter())
    .WriteTo.OpenTelemetry()
);

The connection string is passed via the environment variable APPLICATIONINSIGHTS_CONNECTION_STRING. I can see requests in the Application Insights dashboard, but no traces/logs. What's missing here?

Upvotes: 2

Views: 238

Answers (1)

mrk
mrk

Reputation: 81

UseAzureMonitor calls this under the hood:

builder.Services.AddLogging(
{
    logging.AddOpenTelemetry(builderOptions =>
    {
        builderOptions.IncludeFormattedMessage = true;
    });
});

which in turn registers an <ILoggerProvider, OpenTelemetryLoggerProvider>.

AddSerilog has a default option of writeToProviders = false. If you instead toggle it to true, logs will push through to Application Insights, but it tells you an equivalent Serilog sink should be used instead of writing to all providers.

After toggling that flag, you get double the logs, but I solved that with builder.Logging.ClearProviders();.

I don't know how the library authors intended this integration to look like, but this is my currently working setup:

builder.Logging.ClearProviders();

builder.Services.AddOpenTelemetry()
    .UseAzureMonitor()
    .ConfigureResource(x =>
    {
        x.AddAttributes(new Dictionary<string, object> { { "service.name", "my-service" } });
    });

builder.Services.AddSerilog((services, lc) => lc
    .ReadFrom.Configuration(builder.Configuration)
    .ReadFrom.Services(services)
    .Enrich.FromLogContext()
    .WriteTo.Console(builder.Environment.IsDevelopment()
        ? new RenderedCompactJsonFormatter()
        : new CompactJsonFormatter()), writeToProviders: true);

Upvotes: 5

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