Configure heath check endpoint with custom option.

startup.cs

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    app.UseHealthChecks("/health", new HealthCheckOptions
    {
        ResponseWriter = async (context, report) =>
        {
            context.Response.ContentType = "application/json";
            HealthCheckResponse response = new HealthCheckResponse
            {
                Status = report.Status.ToString(),
                HealthCheckProbes = report.Entries.Select(o => new HealthCheckProbe
                {
                    Component = o.Key,
                    Description = o.Value.Description,
                    Status = o.Value.Status.ToString(),
                    Duration = o.Value.Duration,
                    Exception = o.Value.Exception == null ? string.Empty : o.Value.Exception.ToString(),
                    Message = o.Value.Exception == null ? string.Empty : o.Value.Exception.Message,
                }),
                Duration = report.TotalDuration,
            };
            await context.Response.Body.WriteAsync(JsonSerializer.SerializeToUtf8Bytes(response));
        }
    });
}