WebApi.HealthChecks

WebApi.HealthChecks offers a WebApi implementation of the health check endpoints for reporting the health of app infrastructure components.

The package is available on NuGet

PM> Install-Package WebApi.HealthChecks

Health checks are exposed by an app as HTTP endpoints. Supports two endpoints:

• GET /health?check=:check where check is optional
• GET /health/ui?check=:check where check is optional

By default the health check endpoint is created at /health

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        config.AddHealthChecks(healthEndpoint: "health")
            .Configure(addWarningHeader: true) // optional configuration
            .OverrideResultStatusCodes(unhealthy: HttpStatusCode.InternalServerError) // optional configuration
            .AddCheck("sqlDb", new SqlHealthCheck()) // Singleton instance
            .AddCheck<ICosmosDbCheck>("cosmosDb") // needs to be registered in DependencyResolver
            .AddCheck("lambda", () => new HealthCheckResult(HealthStatus.Healthy, "Lambda check"));
    }
}

Every health check must implement IHealthCheck interface

public interface IHealthCheck
{
    Task<HealthCheckResult> CheckHealthAsync();
}

The framework supports three statuses: Unhealthy , Degraded and Healthy.

GET /health returns json in the following format:

{
  "status": "Degraded",
  "totalResponseTime": 13,
  "entries": {
    "sqlDb": {
      "responseTime": 8,
      "status": "Healthy"
    },
    "cosmosDb": {
      "responseTime": 5,
      "status": "Degraded"
    },
    "lambda": {
      "responseTime": 0,
      "status": "Healthy",
      "description": "Lambda check"
    }
  }
}

The GET /health/ui?check=:check endpoint returns a SVG badge which shows individual status of the service component. For example GET /health/ui?check=cosmosDb will output this image: