public async Task <IActionResult> OldAsync(string url) { if (string.IsNullOrWhiteSpace(url)) { return(Json("")); } var metrics = await _services.AccessPageAndGetResources(url.NormalizeUrl()); StringBuilder sb = new StringBuilder(); foreach (var metric in metrics) { var fields = typeof(AssetPerformance).GetProperties() .Where(methodInfo => methodInfo.GetCustomAttributes(typeof(PrometheusAttribute), true).Length > 0) .ToList(); foreach (var field in fields) { var name = field.GetCustomAttributes(typeof(PrometheusAttribute), true)[0].ToString(); sb.AppendLine($"# HELP {name} TRL"); sb.AppendLine($"# TYPE {name} gauge"); sb.AppendLine($"{name}{{asset=\"{metric.name}\",type=\"{metric.entryType}\"}} {field.GetValue(metric)}"); } } return(Ok(sb.ToString())); }