using System.Linq; using System.Threading.Tasks; using Microsoft.AspNetCore.Builder; using Microsoft.AspNetCore.Diagnostics.HealthChecks; using Microsoft.AspNetCore.Hosting; using Microsoft.AspNetCore.Http; using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.Diagnostics.HealthChecks; namespace HealthChecksSample { // Pass in `--scenario writer` at the command line to run this sample. public class CustomWriterStartup { public void ConfigureServices(IServiceCollection services) { // Registers required services for health checks services.AddHealthChecks(); // This is an example of registering a custom health check as a service. // All IHealthCheck services will be available to the health check service and // middleware. // // We recommend registering all health checks as Singleton services. services.AddSingleton(); } public void Configure(IApplicationBuilder app, IHostingEnvironment env) { // This will register the health checks middleware at the URL /health // // This example overrides the HealthCheckResponseWriter to write the health // check result in a totally custom way. app.UseHealthChecks("/health", new HealthCheckOptions() { // This custom writer formats the detailed status as an HTML table. ResponseWriter = WriteResponse, }); app.Run(async (context) => { await context.Response.WriteAsync("Go to /health to see the health status"); }); } private static Task WriteResponse(HttpContext httpContext, CompositeHealthCheckResult result) { httpContext.Response.ContentType = "text/html"; return httpContext.Response.WriteAsync($@"

Everything is {result.Status}

{string.Join("", result.Results.Select(kvp => $""))}

Name	Status
{kvp.Key}	{kvp.Value.Status}

"); } } }