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Program.cs
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Program.cs
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// <copyright file="Program.cs" company="OpenTelemetry Authors">
// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// </copyright>
using System.Reflection;
using OpenTelemetry.Exporter;
using OpenTelemetry.Instrumentation.AspNetCore;
using OpenTelemetry.Logs;
using OpenTelemetry.Metrics;
using OpenTelemetry.Resources;
using OpenTelemetry.Trace;
var builder = WebApplication.CreateBuilder(args);
var serviceName = "AspNetCoreExampleService";
// OpenTelemetry
var assemblyVersion = Assembly.GetExecutingAssembly().GetName().Version?.ToString() ?? "unknown";
// Switch between Zipkin/Jaeger/OTLP by setting UseExporter in appsettings.json.
var tracingExporter = builder.Configuration.GetValue<string>("UseTracingExporter").ToLowerInvariant();
var resourceBuilder = tracingExporter switch
{
"jaeger" => ResourceBuilder.CreateDefault().AddService(builder.Configuration.GetValue<string>("Jaeger:ServiceName"), serviceVersion: assemblyVersion, serviceInstanceId: Environment.MachineName),
"zipkin" => ResourceBuilder.CreateDefault().AddService(builder.Configuration.GetValue<string>("Zipkin:ServiceName"), serviceVersion: assemblyVersion, serviceInstanceId: Environment.MachineName),
"otlp" => ResourceBuilder.CreateDefault().AddService(builder.Configuration.GetValue<string>("Otlp:ServiceName"), serviceVersion: assemblyVersion, serviceInstanceId: Environment.MachineName),
_ => ResourceBuilder.CreateDefault().AddService(serviceName, serviceVersion: assemblyVersion, serviceInstanceId: Environment.MachineName),
};
// Traces
builder.Services.AddOpenTelemetryTracing(options =>
{
options
.SetResourceBuilder(resourceBuilder)
.SetSampler(new AlwaysOnSampler())
.AddHttpClientInstrumentation()
.AddAspNetCoreInstrumentation();
switch (tracingExporter)
{
case "jaeger":
options.AddJaegerExporter();
builder.Services.Configure<JaegerExporterOptions>(builder.Configuration.GetSection("Jaeger"));
// Customize the HttpClient that will be used when JaegerExporter is configured for HTTP transport.
builder.Services.AddHttpClient("JaegerExporter", configureClient: (client) => client.DefaultRequestHeaders.Add("X-MyCustomHeader", "value"));
break;
case "zipkin":
options.AddZipkinExporter();
builder.Services.Configure<ZipkinExporterOptions>(builder.Configuration.GetSection("Zipkin"));
break;
case "otlp":
options.AddOtlpExporter(otlpOptions =>
{
otlpOptions.Endpoint = new Uri(builder.Configuration.GetValue<string>("Otlp:Endpoint"));
});
break;
default:
options.AddConsoleExporter();
break;
}
});
// For options which can be bound from IConfiguration.
builder.Services.Configure<AspNetCoreInstrumentationOptions>(builder.Configuration.GetSection("AspNetCoreInstrumentation"));
// Logging
builder.Logging.ClearProviders();
builder.Logging.AddOpenTelemetry(options =>
{
options.SetResourceBuilder(resourceBuilder);
var logExporter = builder.Configuration.GetValue<string>("UseLogExporter").ToLowerInvariant();
switch (logExporter)
{
case "otlp":
options.AddOtlpExporter(otlpOptions =>
{
otlpOptions.Endpoint = new Uri(builder.Configuration.GetValue<string>("Otlp:Endpoint"));
});
break;
default:
options.AddConsoleExporter();
break;
}
});
builder.Services.Configure<OpenTelemetryLoggerOptions>(opt =>
{
opt.IncludeScopes = true;
opt.ParseStateValues = true;
opt.IncludeFormattedMessage = true;
});
// Metrics
builder.Services.AddOpenTelemetryMetrics(options =>
{
options.SetResourceBuilder(resourceBuilder)
.AddHttpClientInstrumentation()
.AddAspNetCoreInstrumentation();
var metricsExporter = builder.Configuration.GetValue<string>("UseMetricsExporter").ToLowerInvariant();
switch (metricsExporter)
{
case "prometheus":
options.AddPrometheusExporter();
break;
case "otlp":
options.AddOtlpExporter(otlpOptions =>
{
otlpOptions.Endpoint = new Uri(builder.Configuration.GetValue<string>("Otlp:Endpoint"));
});
break;
default:
options.AddConsoleExporter();
break;
}
});
// Add services to the container.
builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
app.UseSwagger();
app.UseSwaggerUI();
}
app.UseHttpsRedirection();
app.UseAuthorization();
app.MapControllers();
var metricsExporter = builder.Configuration.GetValue<string>("UseMetricsExporter").ToLowerInvariant();
if (metricsExporter == "prometheus")
{
app.UseOpenTelemetryPrometheusScrapingEndpoint();
}
app.Run();