pfm/PostFundManagement.Application/Extensions/Otel.cs

using OpenTelemetry.Exporter;
using OpenTelemetry.Logs;
using OpenTelemetry.Resources;
using OpenTelemetry.Trace;
using OpenTelemetry.Metrics;

namespace PostFundManagement.Application.Extensions;

public static class Otel
{
    public static WebApplicationBuilder AddWebTelemetry(this WebApplicationBuilder builder)
    {
        var serviceName = builder.Configuration.GetValue<string>("Monitoring:ServiceName") ?? "Pfm";
        var endpoint = builder.Configuration.GetValue<string>("Monitoring:Address")!;
        var apiKey = builder.Configuration.GetValue<string>("Monitoring:ApiKey");

        var resourceBuilder = ResourceBuilder.CreateDefault()
            .AddService(serviceName);

        var otlpHeaders = !string.IsNullOrEmpty(apiKey) ? $"x-otlp-api-key={apiKey}" : null;

        builder.Logging.AddOpenTelemetry(logging =>
        {
            logging.SetResourceBuilder(resourceBuilder);
            logging.AddOtlpExporter(opt =>
            {
                opt.Endpoint = new Uri(endpoint);
                opt.Protocol = OtlpExportProtocol.Grpc;
                opt.Headers = otlpHeaders;
            });
        });

        builder.Services.AddOpenTelemetry()
            .WithTracing(tracing => tracing
                .SetResourceBuilder(resourceBuilder)
                .AddAspNetCoreInstrumentation()
                .AddHttpClientInstrumentation()
                .AddOtlpExporter(opt =>
                {
                    opt.Endpoint = new Uri(endpoint);
                    opt.Protocol = OtlpExportProtocol.Grpc;
                    opt.Headers = otlpHeaders;
                }))
            .WithMetrics(metrics => metrics
                .SetResourceBuilder(resourceBuilder)
                .AddMeter(serviceName)
                .AddAspNetCoreInstrumentation()
                .AddRuntimeInstrumentation()
                .AddOtlpExporter(opt =>
                {
                    opt.Endpoint = new Uri(endpoint);
                    opt.Protocol = OtlpExportProtocol.Grpc;
                    opt.Headers = otlpHeaders;
                }));

        return builder;
    }
}