Koto.Observability

One-liner observability setup: Serilog + OpenTelemetry.

What's included

Serilog — structured logs with console sink (dev) + OTLP sink (prod)
OpenTelemetry Traces — ASP.NET Core + HttpClient instrumentation → OTLP
OpenTelemetry Metrics — ASP.NET Core + .NET Runtime → OTLP
CorrelationIdEnricher — adds CorrelationId to every Serilog event

Setup

// Program.cs
builder.AddKotoObservability(opts =>
{
    opts.ServiceName = "orders-service";
    opts.EnableConsoleExporter = true; // dev only
    // wire up correlation ID from the HTTP middleware
    opts.CorrelationIdProvider = () => CorrelationContext.Current.Value;
});

Environment variables

Variable	Default	Purpose
`OTEL_SERVICE_NAME`	`"unknown-service"`	OTel resource service name
`OTEL_EXPORTER_OTLP_ENDPOINT`	`"http://localhost:4317"`	OTLP collector endpoint
`KOTO_LOG_LEVEL`	`"Information"`	Minimum Serilog log level

EF Core instrumentation

OpenTelemetry.Instrumentation.EntityFrameworkCore has no stable NuGet release yet. Add it manually once it ships:

// in WithTracing:
tracing.AddEntityFrameworkCoreInstrumentation();