UseHealthChecks.cs

app.UseHealthChecks("/health", new HealthCheckOptions
{
    ResponseWriter = async (context, report) =>
    {
        context.Response.ContentType = "application/json";

        var response = new HealthCheckResponse
        {
            Status = report.Status.ToString(),
            Checks = report.Entries.Select(x => new HealthCheck
            {
                Component = x.Key,
                Status = x.Value.Status.ToString(),
                Description = x.Value.Description
            }),
            Duration = report.TotalDuration
        };

        await context.Response.WriteAsync(JsonConvert.SerializeObject(response));
    }
});