Lesson 26 of 40 DevOps Intermediate 30 min

Health Checks & Observability

Implement health endpoints, liveness/readiness probes, structured logging with Serilog, and distributed tracing for production observability.

Part 1: ASP.NET Core Health Checks

builder.Services.AddHealthChecks()
  .AddDbContextCheck<AppDbContext>()
  .AddRedis(redisConnectionString)
  .AddUrlGroup(new Uri("https://api.external.com/ping"), "external-api");

app.MapHealthChecks("/healthz");
app.MapHealthChecks("/ready");

Part 2: Structured Logging with Serilog

builder.Host.UseSerilog((ctx, cfg) => cfg
  .ReadFrom.Configuration(ctx.Configuration)
  .Enrich.FromLogContext()
  .WriteTo.Console(LogEventLevel.Debug)
  .WriteTo.ApplicationInsights(telemetryClient, TelemetryConverter.Traces));

Part 3: Log Scopes for Correlation

using _logger.BeginScope(new Dictionary<string, object>
{
  ["OrderId"] = orderId,
  ["UserId"] = userId
})
{
  // All logs inside scope include OrderId and UserId
  _logger.LogInformation("Processing order");
}

Part 4: Application Insights Integration

builder.Services.AddApplicationInsightsTelemetry();

// Custom events
_telemetry.TrackEvent("OrderPlaced", new Dictionary<string, string>
{
  ["OrderId"] = order.Id.ToString(),
  ["Value"] = order.Total.ToString()
});