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Blazor_Canvas/BlazorCanvas/BlazorCanvas.ServiceDefaults/Extensions.cs

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C#
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using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Diagnostics.HealthChecks;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Diagnostics.HealthChecks;
using Microsoft.Extensions.Logging;
using OpenTelemetry.Logs;
using OpenTelemetry.Metrics;
using OpenTelemetry.Trace;
namespace Microsoft.Extensions.Hosting;
public static class Extensions
{
public static IHostApplicationBuilder AddServiceDefaults(this IHostApplicationBuilder builder)
{
builder.ConfigureOpenTelemetry();
builder.AddDefaultHealthChecks();
builder.Services.AddServiceDiscovery();
builder.Services.ConfigureHttpClientDefaults(http =>
{
// Turn on resilience by default
http.AddStandardResilienceHandler();
// Turn on service discovery by default
http.UseServiceDiscovery();
});
return builder;
}
public static IHostApplicationBuilder ConfigureOpenTelemetry(this IHostApplicationBuilder builder)
{
builder.Logging.AddOpenTelemetry(logging =>
{
logging.IncludeFormattedMessage = true;
logging.IncludeScopes = true;
});
builder.Services.AddOpenTelemetry()
.WithMetrics(metrics =>
{
metrics.AddRuntimeInstrumentation()
.AddBuiltInMeters();
})
.WithTracing(tracing =>
{
if (builder.Environment.IsDevelopment())
{
// We want to view all traces in development
tracing.SetSampler(new AlwaysOnSampler());
}
tracing.AddAspNetCoreInstrumentation()
.AddGrpcClientInstrumentation()
.AddHttpClientInstrumentation();
});
builder.AddOpenTelemetryExporters();
return builder;
}
private static IHostApplicationBuilder AddOpenTelemetryExporters(this IHostApplicationBuilder builder)
{
var useOtlpExporter = !string.IsNullOrWhiteSpace(builder.Configuration["OTEL_EXPORTER_OTLP_ENDPOINT"]);
if (useOtlpExporter)
{
builder.Services.Configure<OpenTelemetryLoggerOptions>(logging => logging.AddOtlpExporter());
builder.Services.ConfigureOpenTelemetryMeterProvider(metrics => metrics.AddOtlpExporter());
builder.Services.ConfigureOpenTelemetryTracerProvider(tracing => tracing.AddOtlpExporter());
}
// Uncomment the following lines to enable the Prometheus exporter (requires the OpenTelemetry.Exporter.Prometheus.AspNetCore package)
// builder.Services.AddOpenTelemetry()
// .WithMetrics(metrics => metrics.AddPrometheusExporter());
// Uncomment the following lines to enable the Azure Monitor exporter (requires the Azure.Monitor.OpenTelemetry.Exporter package)
// builder.Services.AddOpenTelemetry()
// .UseAzureMonitor();
return builder;
}
public static IHostApplicationBuilder AddDefaultHealthChecks(this IHostApplicationBuilder builder)
{
builder.Services.AddHealthChecks()
// Add a default liveness check to ensure app is responsive
.AddCheck("self", () => HealthCheckResult.Healthy(), ["live"]);
return builder;
}
public static WebApplication MapDefaultEndpoints(this WebApplication app)
{
// Uncomment the following line to enable the Prometheus endpoint (requires the OpenTelemetry.Exporter.Prometheus.AspNetCore package)
// app.MapPrometheusScrapingEndpoint();
// All health checks must pass for app to be considered ready to accept traffic after starting
app.MapHealthChecks("/health");
// Only health checks tagged with the "live" tag must pass for app to be considered alive
app.MapHealthChecks("/alive", new HealthCheckOptions
{
Predicate = r => r.Tags.Contains("live")
});
return app;
}
private static MeterProviderBuilder AddBuiltInMeters(this MeterProviderBuilder meterProviderBuilder) =>
meterProviderBuilder.AddMeter(
"Microsoft.AspNetCore.Hosting",
"Microsoft.AspNetCore.Server.Kestrel",
"System.Net.Http");
}